Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
Loading...
| Parameter | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Formula | Notes |
|---|---|
container_cpu_used
millicores
The CPUs used by the container
container_cpu_throttle_time
percent
The amount of time the CPU has been throttled
container_cpu_request
millicores
The CPUs requested for the container
container_cpu_throttled_millicores
millicores
The CPUs throttling per container in millicores
container_cpu_limit
millicores
The CPUs allowed for the container
container_cpu_util
percent
The percentage of CPUs used with respect to the limit
container_memory_util
percent
The percentage of memory used with respect to the limit. Memory used includes all types of memory, including file system cache
container_memory_util_nocache
percent
The percentage of working set memory used with respect to the limit
container_memory_used
bytes
The total amount of memory used by the container. Memory used includes all types of memory, including file system cache
container_memory_request
bytes
The memory requested for the container
container_memory_limit
bytes
The memory limit for the container
container_memory_working_set
bytes
The current working set in bytes
container_memory_limit_hits
hits/s
The number of times per second the used memory hit the limit
container_memory_limit_util
percent
Percent memory limit per container relative to total physical memory of the host.
container_host_memory_total
bytes
Total physical memory on the host.
cpu_request
integer
millicores
You should select your own default value.
You should select your own domain.
yes
Amount of CPU resources requests in CPU units (milllicores)
cpu_limit
integer
millicores
You should select your own default value.
You should select your own domain.
yes
Limits on the amount of CPU resources usage in CPU units (millicores)
memory_request
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Amount of memory resources requests in megabytes
memory_limit
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Limits on the amount of memory resources usage in megabytes
component_name.cpu_request <= component_name.cpu_limit
component_name.memory_request <= component_name.memory_limit
This section documents Akamas out-of-the-box optimization packs.
| Optimization Pack | Support for applications |
|---|---|
based on Linux operating system
based on MS .Net technology
based on OpenJDK and Oracle HotSpot JVM
based on Eclipse OpenJ9 VM (formerly known as IBM J9)
based on NodeJS
based on GO runtime (aka Golang)
exposed as web applications
based on Docker containters
based on Kubernetes containters
based on WebSphere middleware
based on Apache Spark middleware
based on PostgreSQL database
based on Cassandra database
based on MySQL database
based on Oracle database
based on MongoDB database
based on Elasticsearch database
based on AWS EC2 or Lambda resources
The Linux optimization pack helps you optimize Linux-based systems. The optimization pack provides component types for various Linux distributions, thus enabling performance improvements on a plethora of different configurations.
Through this optimization pack, Akamas is able to tackle the problem of performance of Linux-based systems from both the point of you of cost savings, as well as quality and level of service: the included component types bring in parameters that act on the memory footprint of systems, on their ability to sustain higher levels of traffic, on their capacity of leveraging all the available resources and on their potential for lower latency transactions.
Each component type providers parameters that cover four main areas of tuning:
CPU tasks scheduling (for example, if to auto-group and schedule together similar tasks)
Memory (for example, the limit on memory usage for which start swapping pages on disk)
Network (for example, the size of the buffers used to write/read network packets)
Storage (for example, the type of storage scheduler)
| Component Type | Description |
|---|---|
Here’s the command to install the Linux optimization pack using the Akamas CLI:
For more information on the process of installing or upgrading an optimization pack refer to Install Optimization Packs.
| Metric | Description |
|---|
| Metric | Description |
|---|
| Metric | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
Amazon Linux AMI
Amazon Linux 2 AMI
Amazon Linux 2022 AMI
CentOS Linux distribution version 7.x
CentOS Linux distribution version 8.x
Red Hat Enterprise Linux distribution version 7.x
Red Hat Enterprise Linux distribution version 8.x
Ubuntu Linux distribution by Canonical version 16.04 (LTS)
Ubuntu Linux distribution by Canonical version 18.04 (LTS)
Ubuntu Linux distribution by Canonical version 20.04 (LTS)
cpu_load_avg | tasks | The system load average (i.e., the number of active tasks in the system) |
cpu_num | CPUs | The number of CPUs available in the system (physical and logical) |
cpu_util | percent | The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work) |
cpu_used | CPUs | The average number of CPUs used in the system (physical and logical) |
cpu_util_details | percent | The average CPU utilization % broken down by usage type and CPU number (e.g., cp1 user, cp2 system, cp3 soft-irq) |
mem_fault | faults/s | The number of memory faults (minor+major) |
mem_fault_major | faults/s | The number of major memory faults (i.e., faults that cause disk access) per second |
mem_fault_minor | faults/s | The number of minor memory faults (i.e., faults that do not cause disk access) per second |
mem_swapins | pages/s | The number of memory pages swapped in per second |
mem_swapouts | pages/s | The number of memory pages swapped out per second |
mem_total | bytes | The total amount of installed memory |
mem_used | bytes | The total amount of memory used |
mem_used_nocache | bytes | The total amount of memory used without considering memory reserved for caching purposes |
mem_util | percent | The memory utilization % (i.e, the % of memory used) |
mem_util_details | percent | The memory utilization % (i.e., the % of memory used) broken down by usage type (e.g., active memory) |
mem_util_nocache | percent | The memory utilization % (i.e., the % of memory used) without considering memory reserved for caching purposes |
disk_io_inflight_details | ops | The number of IO disk operations in progress (outstanding) broken down by disk (e.g., disk /dev/nvme01) |
disk_iops | ops/s | The average number of IO disk operations per second across all disks |
disk_iops_details | ops/s | The number of IO disk-write operations per second broken down by disk (e.g., disk /dev/nvme01) |
disk_iops_reads | ops/s | The average number of IO disk-read operations per second across all disks |
disk_iops_writes | ops/s | The average number of IO disk-write operations per second across all disks |
disk_read_bytes | bytes/s | The number of bytes per second read across all disks |
disk_read_bytes_details | bytes/s | The average response time of IO disk operations broken down by disk (e.g., disk C://) |
disk_read_write_bytes | bytes/s | The number of bytes per second written across all disks |
disk_response_time_details | seconds | The average response time of IO disk operations broken down by disk (e.g., disk C://) |
disk_response_time_read | seconds | The average response time of read disk operations |
disk_response_time_worst | seconds | The average response time of IO disk operations of the slowest disk |
disk_response_time_write | seconds | The average response time of write on disk operations |
disk_swap_used | bytes | The total amount of space used by swap disks |
disk_swap_util | percent | The average space utilization % of swap disks |
disk_util_details | percent | The utilization % of disk, i.e how much time a disk is busy doing work broken down by disk (e.g., disk D://) |
disk_write_bytes | bytes/s | The number of bytes per second written across all disks |
disk_write_bytes_details | bytes/s | The number of bytes per second written from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation WRITE) |
filesystem_size | bytes | The size of filesystems broken down by type and device (e.g., filesystem of type ext4 for device /dev/nvme01) |
filesystem_used | bytes | The amount of space used on the filesystems broken down by type and device (e.g., filesystem of type zfs on device /dev/nvme01) |
filesystem_util | percent | The space utilization % of filesystems broken down by type and device (e.g., filesystem of type overlayfs on device /dev/loop1) |
network_in_bytes_details | bytes/s | The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0) |
network_out_bytes_details | bytes/s | The number of outbound network packets in bytes per second broken down by network device (e.g., eth01) |
network_tcp_retrans | retrans/s | The number of network TCP retransmissions per second |
os_context_switch | switches/s | The number of context switches per second |
proc_blocked | processes | The number of processes blocked (e.g, for IO or swapping reasons) |
os_cpuSchedMinGranularity | integer | nanoseconds | 1500000 | 300000 → 30000000 | no | Minimal preemption granularity (in nanoseconds) for CPU bound tasks |
os_cpuSchedWakeupGranularity | integer | nanoseconds | 2000000 | 400000 → 40000000 | no | Scheduler Wakeup Granularity (in nanoseconds) |
os_CPUSchedMigrationCost | integer | nanoseconds | 500000 | 100000 → 5000000 | no | Amount of time (in nanoseconds) after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations |
os_CPUSchedChildRunsFirst | integer | 0 |
| no | A freshly forked child runs before the parent continues execution |
os_CPUSchedLatency | integer | nanoseconds | 12000000 | 2400000 → 240000000 | no | Targeted preemption latency (in nanoseconds) for CPU bound tasks |
os_CPUSchedAutogroupEnabled | integer | 0 |
| no | Enables the Linux task auto-grouping feature, where the kernel assigns related tasks to groups and schedules them together on CPUs to achieve higher performance for some workloads |
os_CPUSchedNrMigrate | integer | 32 | 3 → 320 | no | Scheduler NR Migrate |
os_MemorySwappiness | integer | percent | 60 | 0 → 100 | no | The percentage of RAM free space for which the kernel will start swapping pages to disk |
os_MemoryVmVfsCachePressure | integer | 100 | 10 → 100 | no | VFS Cache Pressure |
os_MemoryVmCompactionProactiveness | integer | 20 | 0 → 100 | Determines how aggressively compaction is done in the background |
os_MemoryVmPageLockUnfairness | integer | 5 | 0 → 1000 | no | Set the level of unfairness in the page lock queue. |
os_MemoryVmWatermarkScaleFactor | integer | 10 | 0 → 1000 | no | The amount of memory, expressed as fractions of 10'000, left in a node/system before kswapd is woken up and how much memory needs to be free before kswapd goes back to sleep |
os_MemoryVmWatermarkBoostFactor | integer | 15000 | 0 → 30000 | no | The level of reclaim when the memory is being fragmented, expressed as fractions of 10'000 of a zone's high watermark |
os_MemoryVmMinFree | integer | 67584 | 10240 → 1024000 | no | Minimum Free Memory (in kbytes) |
os_MemoryTransparentHugepageEnabled | categorical |
|
| no | Transparent Hugepage Enablement Flag |
os_MemoryTransparentHugepageDefrag | categorical |
|
| no | Transparent Hugepage Enablement Defrag |
os_MemorySwap | categorical |
|
| no | Memory Swap |
os_MemoryVmDirtyRatio | integer | 20 | 1 → 99 | no | When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write |
os_MemoryVmDirtyBackgroundRatio | integer | 10 | 1 → 99 | no | When the dirty memory pages exceed this percentage of the total memory, the kernel begins to write them asynchronously in the background |
os_MemoryVmDirtyExpire | integer | centiseconds | 3000 | 300 → 30000 | no | When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write |
os_MemoryVmDirtyWriteback | integer | centiseconds | 500 | 50 → 5000 | no | Memory Dirty Writeback (in centisecs) |
os_NetworkNetCoreSomaxconn | integer | megabytes | 128 | 12 → 8192 | no | Network Max Connections |
os_NetworkNetCoreNetdevMaxBacklog | integer | megabytes/s | 1000 | 100 → 10000 | no | Network Max Backlog |
os_NetworkNetIpv4TcpMaxSynBacklog | integer | milliseconds | 256 | 52 → 5120 | no | Network IPV4 Max Sync Backlog |
os_NetworkNetCoreNetdevBudget | integer | 300 | 30 → 30000 | no | Network Budget |
os_NetworkNetCoreRmemMax | integer | 212992 | 21299 → 2129920 | no | Maximum network receive buffer size that applications can request |
os_NetworkNetCoreWmemMax | integer | 212992 | 21299 → 2129920 | no | Maximum network transmit buffer size that applications can request |
os_NetworkNetIpv4TcpSlowStartAfterIdle | integer | 1 |
| no | Network Slow Start After Idle Flag |
os_NetworkNetIpv4TcpFinTimeout | integer | 60 | 6 → 600 | no | Network TCP timeout |
os_NetworkRfs | integer | 0 | 0 → 131072 | no | If enabled increases datacache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is running |
os_StorageReadAhead | integer | kilobytes | 128 | 0 → 4096 | no | Read-ahead speeds up file access by pre-fetching data and loading it into the page cache so that it can be available earlier in memory instead of from disk |
os_StorageNrRequests | integer | 32 | 12 → 1280 | no | Storage Number of Requests |
os_StorageRqAffinity | integer | 1 |
| no | Storage Requests Affinity |
os_StorageQueueScheduler | integer |
|
| no | Storage Queue Scheduler Type |
os_StorageNomerges | integer | 0 | 0 → 2 | no | Enables the user to disable the lookup logic involved with IO merging requests in the block layer. By default (0) all merges are enabled. With 1 only simple one-hit merges will be tried. With 2 no merge algorithms will be tried |
os_StorageMaxSectorsKb | integer | kilobytes | 256 | 32 → 256 | no | The largest IO size that the OS can issue to a block device |
This page describes the Optimization Pack for the component type CentOS 7.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
Notice: you can use a device custom filter to monitor a specific disk with Prometheus. You can find more information on Prometheus queries and the %FILTERS% placeholder here: Prometheus provider and here: Prometheus provider metrics mapping.
There are no general constraints among CentOS 7 parameters.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Metric | Description |
|---|
| Metric | Description |
|---|
| Metric | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Metric | Description |
|---|
| Metric | Description |
|---|
| Metric | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default Value | Domain | Restart | Description |
|---|
cpu_num
CPUs
The number of CPUs available in the system (physical and logical)
cpu_util
percent
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
cpu_util_details
percent
The average CPU utilization % broken down by usage type and cpu number (e.g., cp1 user, cp2 system, cp3 soft-irq)
cpu_load_avg
tasks
The system load average (i.e., the number of active tasks in the system)
mem_util
percent
The memory utilization % (i.e, the % of memory used)
mem_util_nocache
percent
The memory utilization % (i.e., the % of memory used) without considering memory reserved for caching purposes
mem_util_details
percent
The memory utilization % (i.e., the % of memory used) broken down by usage type (e.g., active memory)
mem_used
bytes
The total amount of memory used
mem_used_nocache
bytes
The total amount of memory used without considering memory reserved for caching purposes
mem_total
bytes
The total amount of installed memory
mem_fault_minor
faults/s
The number of minor memory faults (i.e., faults that do not cause disk access) per second
mem_fault_major
faults/s
The number of major memory faults (i.e., faults that cause disk access) per second
mem_fault
faults/s
The number of memory faults (major + minor)
mem_swapins
pages/s
The number of memory pages swapped in per second
mem_swapouts
pages/s
The number of memory pages swapped out per second
network_tcp_retrans
retrans/s
The number of network TCP retransmissions per second
network_in_bytes_details
bytes/s
The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0)
network_out_bytes_details
bytes/s
The number of outbound network packets in bytes per second broken down by network device (e.g., eth01)
disk_swap_util
percent
The average space utilization % of swap disks
disk_swap_used
bytes
The total amount of space used by swap disks
disk_util_details
percent
The utilization % of disk, i.e how much time a disk is busy doing work broken down by disk (e.g., disk D://)
disk_iops_writes
ops/s
The average number of IO disk-write operations per second across all disks
disk_iops_reads
ops/s
The average number of IO disk-read operations per second across all disks
disk_iops
ops/s
The average number of IO disk operations per second across all disks
disk_response_time_read
seconds
The average response time of IO read-disk operations
disk_response_time_worst
seconds
The average response time of IO disk operations of the slowest disk
disk_response_time_write
seconds
The average response time of IO write-disk operations
disk_response_time_details
ops/s
The average response time of IO disk operations broken down by disk (e.g., disk /dev/nvme01 )
disk_iops_details
ops/s
The number of IO disk-write operations of per second broken down by disk (e.g., disk /dev/nvme01)
disk_io_inflight_details
ops
The number of IO disk operations in progress (outstanding) broken down by disk (e.g., disk /dev/nvme01)
disk_write_bytes
bytes/s
The number of bytes per second written across all disks
disk_read_bytes
bytes/s
The number of bytes per second read across all disks
disk_read_write_bytes
bytes/s
The number of bytes per second read and written across all disks
disk_write_bytes_details
bytes/s
The number of bytes per second written from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation WRITE)
disk_read_bytes_details
bytes/s
The number of bytes per second read from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation READ)
filesystem_util
percent
The space utilization % of filesystems broken down by type and device (e.g., filesystem of type overlayfs on device /dev/loop1)
filesystem_used
bytes
The amount of space used on the filesystems broken down by type and device (e.g., filesystem of type zfs on device /dev/nvme01)
filesystem_size
bytes
The size of filesystems broken down by type and device (e.g., filesystem of type ext4 for device /dev/nvme01)
proc_blocked
processes
The number of processes blocked (e.g, for IO or swapping reasons)
os_context_switch
switches/s
The number of context switches per second
os_cpuSchedMinGranularity
2250000 ns
300000→30000000 ns
Minimal preemption granularity (in nanoseconds) for CPU bound tasks
os_cpuSchedWakeupGranularity
3000000 ns
400000→40000000 ns
Scheduler Wakeup Granularity (in nanoseconds)
os_CPUSchedMigrationCost
500000 ns
100000→5000000 ns
Amount of time (in nanoseconds) after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations
os_CPUSchedChildRunsFirst
0
0→1
A freshly forked child runs before the parent continues execution
os_CPUSchedLatency
18000000 ns
2400000→240000000 ns
Targeted preemption latency (in nanoseconds) for CPU bound tasks
os_CPUSchedAutogroupEnabled
1
0→1
Enables the Linux task auto-grouping feature, where the kernel assigns related tasks to groups and schedules them together on CPUs to achieve higher performance for some workloads
os_CPUSchedNrMigrate
32
3→320
Scheduler NR Migrate
os_MemorySwappiness
1
0→100
Memory Swappiness
os_MemoryVmVfsCachePressure
100 %
10→100 %
VFS Cache Pressure
os_MemoryVmMinFree
67584 KB
10240→1024000 KB
Minimum Free Memory
os_MemoryVmDirtyRatio
20 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write
os_MemoryVmDirtyBackgroundRatio
10 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, the kernel begins to write them asynchronously in the background
os_MemoryTransparentHugepageEnabled
always
always never
Transparent Hugepage Enablement
os_MemoryTransparentHugepageDefrag
always
always never
Transparent Hugepage Enablement Defrag
os_MemorySwap
swapon
swapon swapoff
Memory Swap
os_MemoryVmDirtyExpire
3000 centisecs
300→30000 centisecs
Memory Dirty Expiration Time
os_MemoryVmDirtyWriteback
500 centisecs
50→5000 centisecs
Memory Dirty Writeback
os_NetworkNetCoreSomaxconn
128 connections
12→1200 connections
Network Max Connections
os_NetworkNetCoreNetdevMaxBacklog
1000 packets
100→10000 packets
Network Max Backlog
os_NetworkNetIpv4TcpMaxSynBacklog
1024 packets
52→15120 packets
Network IPV4 Max Sync Backlog
os_NetworkNetCoreNetdevBudget
300 packets
30→3000 packets
Network Budget
os_NetworkNetCoreRmemMax
212992 bytes
21299→2129920 bytes
Maximum network receive buffer size that applications can request
os_NetworkNetCoreWmemMax
21299→2129920 bytes
21299→2129920 bytes
Maximum network transmit buffer size that applications can request
os_NetworkNetIpv4TcpSlowStartAfterIdle
1
0→1
Network Slow Start After Idle Flag
os_NetworkNetIpv4TcpFinTimeout
60
6 →600 seconds
Network TCP timeout
os_NetworkRfs
0
0→131072
If enabled increases datacache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is running
os_StorageReadAhead
128 KB
0→1024 KB
Read-ahead speeds up file access by pre-fetching data and loading it into the page cache so that it can be available earlier in memory instead of from disk
os_StorageNrRequests
1000 packets
100→10000 packets
Network Max Backlog
os_StorageRqAffinity
1
1→2
Storage Requests Affinity
os_StorageQueueScheduler
none
none kyber
Storage Queue Scheduler Type
os_StorageNomerges
0
0→2
Enables the user to disable the lookup logic involved with IO merging requests in the block layer. By default (0) all merges are enabled. With 1 only simple one-hit merges will be tried. With 2 no merge algorithms will be tried
os_StorageMaxSectorsKb
128 KB
32→128 KB
The largest IO size that the OS c
cpu_load_avg | tasks | The system load average (i.e., the number of active tasks in the system) |
cpu_num | CPUs | The number of CPUs available in the system (physical and logical) |
cpu_util | percent | The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work) |
cpu_used | CPUs | The average number of CPUs used in the system (physical and logical) |
cpu_util_details | percent | The average CPU utilization % broken down by usage type and CPU number (e.g., cp1 user, cp2 system, cp3 soft-irq) |
mem_fault | faults/s | The number of memory faults (minor+major) |
mem_fault_major | faults/s | The number of major memory faults (i.e., faults that cause disk access) per second |
mem_fault_minor | faults/s | The number of minor memory faults (i.e., faults that do not cause disk access) per second |
mem_swapins | pages/s | The number of memory pages swapped in per second |
mem_swapouts | pages/s | The number of memory pages swapped out per second |
mem_total | bytes | The total amount of installed memory |
mem_used | bytes | The total amount of memory used |
mem_used_nocache | bytes | The total amount of memory used without considering memory reserved for caching purposes |
mem_util | percent | The memory utilization % (i.e, the % of memory used) |
mem_util_details | percent | The memory utilization % (i.e., the % of memory used) broken down by usage type (e.g., active memory) |
mem_util_nocache | percent | The memory utilization % (i.e., the % of memory used) without considering memory reserved for caching purposes |
disk_io_inflight_details | ops | The number of IO disk operations in progress (outstanding) broken down by disk (e.g., disk /dev/nvme01) |
disk_iops | ops/s | The average number of IO disk operations per second across all disks |
disk_iops_details | ops/s | The number of IO disk-write operations per second broken down by disk (e.g., disk /dev/nvme01) |
disk_iops_reads | ops/s | The average number of IO disk-read operations per second across all disks |
disk_iops_writes | ops/s | The average number of IO disk-write operations per second across all disks |
disk_read_bytes | bytes/s | The number of bytes per second read across all disks |
disk_read_bytes_details | bytes/s | The average response time of IO disk operations broken down by disk (e.g., disk C://) |
disk_read_write_bytes | bytes/s | The number of bytes per second written across all disks |
disk_response_time_details | seconds | The average response time of IO disk operations broken down by disk (e.g., disk C://) |
disk_response_time_read | seconds | The average response time of read disk operations |
disk_response_time_worst | seconds | The average response time of IO disk operations of the slowest disk |
disk_response_time_write | seconds | The average response time of write on disk operations |
disk_swap_used | bytes | The total amount of space used by swap disks |
disk_swap_util | percent | The average space utilization % of swap disks |
disk_util_details | percent | The utilization % of disk, i.e how much time a disk is busy doing work broken down by disk (e.g., disk D://) |
disk_write_bytes | bytes/s | The number of bytes per second written across all disks |
disk_write_bytes_details | bytes/s | The number of bytes per second written from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation WRITE) |
filesystem_size | bytes | The size of filesystems broken down by type and device (e.g., filesystem of type ext4 for device /dev/nvme01) |
filesystem_used | bytes | The amount of space used on the filesystems broken down by type and device (e.g., filesystem of type zfs on device /dev/nvme01) |
filesystem_util | percent | The space utilization % of filesystems broken down by type and device (e.g., filesystem of type overlayfs on device /dev/loop1) |
network_in_bytes_details | bytes/s | The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0) |
network_out_bytes_details | bytes/s | The number of outbound network packets in bytes per second broken down by network device (e.g., eth01) |
network_tcp_retrans | retrans/s | The number of network TCP retransmissions per second |
os_context_switch | switches/s | The number of context switches per second |
proc_blocked | processes | The number of processes blocked (e.g, for IO or swapping reasons) |
os_cpuSchedMinGranularity | integer | nanoseconds | 1500000 | 300000 → 30000000 | no | Minimal preemption granularity (in nanoseconds) for CPU bound tasks |
os_cpuSchedWakeupGranularity | integer | nanoseconds | 2000000 | 400000 → 40000000 | no | Scheduler Wakeup Granularity (in nanoseconds) |
os_CPUSchedMigrationCost | integer | nanoseconds | 500000 | 100000 → 5000000 | no | Amount of time (in nanoseconds) after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations |
os_CPUSchedChildRunsFirst | integer | 0 |
| no | A freshly forked child runs before the parent continues execution |
os_CPUSchedLatency | integer | nanoseconds | 12000000 | 2400000 → 240000000 | no | Targeted preemption latency (in nanoseconds) for CPU bound tasks |
os_CPUSchedAutogroupEnabled | integer | 0 |
| no | Enables the Linux task auto-grouping feature, where the kernel assigns related tasks to groups and schedules them together on CPUs to achieve higher performance for some workloads |
os_CPUSchedNrMigrate | integer | 32 | 3 → 320 | no | Scheduler NR Migrate |
os_MemorySwappiness | integer | percent | 60 | 0 → 100 | no | The percentage of RAM free space for which the kernel will start swapping pages to disk |
os_MemoryVmVfsCachePressure | integer | 100 | 10 → 100 | no | VFS Cache Pressure |
os_MemoryVmCompactionProactiveness | integer | Determines how aggressively compaction is done in the background |
os_MemoryVmMinFree | integer | 67584 | 10240 → 1024000 | no | Minimum Free Memory (in kbytes) |
os_MemoryTransparentHugepageEnabled | categorical |
|
| no | Transparent Hugepage Enablement Flag |
os_MemoryTransparentHugepageDefrag | categorical |
|
| no | Transparent Hugepage Enablement Defrag |
os_MemorySwap | categorical |
|
| no | Memory Swap |
os_MemoryVmDirtyRatio | integer | 20 | 1 → 99 | no | When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write |
os_MemoryVmDirtyBackgroundRatio | integer | 10 | 1 → 99 | no | When the dirty memory pages exceed this percentage of the total memory, the kernel begins to write them asynchronously in the background |
os_MemoryVmDirtyExpire | integer | centiseconds | 3000 | 300 → 30000 | no | When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write |
os_MemoryVmDirtyWriteback | integer | centiseconds | 500 | 50 → 5000 | no | Memory Dirty Writeback (in centisecs) |
os_NetworkNetCoreSomaxconn | integer | megabytes | 128 | 12 → 8192 | no | Network Max Connections |
os_NetworkNetCoreNetdevMaxBacklog | integer | megabytes/s | 1000 | 100 → 10000 | no | Network Max Backlog |
os_NetworkNetIpv4TcpMaxSynBacklog | integer | milliseconds | 256 | 52 → 5120 | no | Network IPV4 Max Sync Backlog |
os_NetworkNetCoreNetdevBudget | integer | 300 | 30 → 30000 | no | Network Budget |
os_NetworkNetCoreRmemMax | integer | 212992 | 21299 → 2129920 | no | Maximum network receive buffer size that applications can request |
os_NetworkNetCoreWmemMax | integer | 212992 | 21299 → 2129920 | no | Maximum network transmit buffer size that applications can request |
os_NetworkNetIpv4TcpSlowStartAfterIdle | integer | 1 |
| no | Network Slow Start After Idle Flag |
os_NetworkNetIpv4TcpFinTimeout | integer | 60 | 6 → 600 | no | Network TCP timeout |
os_NetworkRfs | integer | 0 | 0 → 131072 | no | If enabled increases datacache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is running |
os_StorageReadAhead | integer | kilobytes | 128 | 0 → 4096 | no | Read-ahead speeds up file access by pre-fetching data and loading it into the page cache so that it can be available earlier in memory instead of from disk |
os_StorageNrRequests | integer | 32 | 12 → 1280 | no | Storage Number of Requests |
os_StorageRqAffinity | integer | 1 |
| no | Storage Requests Affinity |
os_StorageNomerges | integer | 0 | 0 → 2 | no | Enables the user to disable the lookup logic involved with IO merging requests in the block layer. By default (0) all merges are enabled. With 1 only simple one-hit merges will be tried. With 2 no merge algorithms will be tried |
os_StorageMaxSectorsKb | integer | kilobytes | 256 | 32 → 256 | no | The largest IO size that the OS can issue to a block device |
cpu_load_avg | tasks | The system load average (i.e., the number of active tasks in the system) |
cpu_num | CPUs | The number of CPUs available in the system (physical and logical) |
cpu_util | percent | The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work) |
cpu_used | CPUs | The average number of CPUs used in the system (physical and logical) |
cpu_util_details | percent | The average CPU utilization % broken down by usage type and CPU number (e.g., cp1 user, cp2 system, cp3 soft-irq) |
mem_fault | faults/s | The number of memory faults (minor+major) |
mem_fault_major | faults/s | The number of major memory faults (i.e., faults that cause disk access) per second |
mem_fault_minor | faults/s | The number of minor memory faults (i.e., faults that do not cause disk access) per second |
mem_swapins | pages/s | The number of memory pages swapped in per second |
mem_swapouts | pages/s | The number of memory pages swapped out per second |
mem_total | bytes | The total amount of installed memory |
mem_used | bytes | The total amount of memory used |
mem_used_nocache | bytes | The total amount of memory used without considering memory reserved for caching purposes |
mem_util | percent | The memory utilization % (i.e, the % of memory used) |
mem_util_details | percent | The memory utilization % (i.e., the % of memory used) broken down by usage type (e.g., active memory) |
mem_util_nocache | percent | The memory utilization % (i.e., the % of memory used) without considering memory reserved for caching purposes |
disk_io_inflight_details | ops | The number of IO disk operations in progress (outstanding) broken down by disk (e.g., disk /dev/nvme01) |
disk_iops | ops/s | The average number of IO disk operations per second across all disks |
disk_iops_details | ops/s | The number of IO disk-write operations per second broken down by disk (e.g., disk /dev/nvme01) |
disk_iops_reads | ops/s | The average number of IO disk-read operations per second across all disks |
disk_iops_writes | ops/s | The average number of IO disk-write operations per second across all disks |
disk_read_bytes | bytes/s | The number of bytes per second read across all disks |
disk_read_bytes_details | bytes/s | The average response time of IO disk operations broken down by disk (e.g., disk C://) |
disk_read_write_bytes | bytes/s | The number of bytes per second written across all disks |
disk_response_time_details | seconds | The average response time of IO disk operations broken down by disk (e.g., disk C://) |
disk_response_time_read | seconds | The average response time of read disk operations |
disk_response_time_worst | seconds | The average response time of IO disk operations of the slowest disk |
disk_response_time_write | seconds | The average response time of write on disk operations |
disk_swap_used | bytes | The total amount of space used by swap disks |
disk_swap_util | percent | The average space utilization % of swap disks |
disk_util_details | percent | The utilization % of disk, i.e how much time a disk is busy doing work broken down by disk (e.g., disk D://) |
disk_write_bytes | bytes/s | The number of bytes per second written across all disks |
disk_write_bytes_details | bytes/s | The number of bytes per second written from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation WRITE) |
filesystem_size | bytes | The size of filesystems broken down by type and device (e.g., filesystem of type ext4 for device /dev/nvme01) |
filesystem_used | bytes | The amount of space used on the filesystems broken down by type and device (e.g., filesystem of type zfs on device /dev/nvme01) |
filesystem_util | percent | The space utilization % of filesystems broken down by type and device (e.g., filesystem of type overlayfs on device /dev/loop1) |
network_in_bytes_details | bytes/s | The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0) |
network_out_bytes_details | bytes/s | The number of outbound network packets in bytes per second broken down by network device (e.g., eth01) |
network_tcp_retrans | retrans/s | The number of network TCP retransmissions per second |
os_context_switch | switches/s | The number of context switches per second |
proc_blocked | processes | The number of processes blocked (e.g, for IO or swapping reasons) |
os_cpuSchedMinGranularity | integer | nanoseconds | 1500000 | 300000 → 30000000 | no | Minimal preemption granularity (in nanoseconds) for CPU bound tasks |
os_cpuSchedWakeupGranularity | integer | nanoseconds | 2000000 | 400000 → 40000000 | no | Scheduler Wakeup Granularity (in nanoseconds) |
os_CPUSchedMigrationCost | integer | nanoseconds | 500000 | 100000 → 5000000 | no | Amount of time (in nanoseconds) after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations |
os_CPUSchedChildRunsFirst | integer | 0 |
| no | A freshly forked child runs before the parent continues execution |
os_CPUSchedLatency | integer | nanoseconds | 12000000 | 2400000 → 240000000 | no | Targeted preemption latency (in nanoseconds) for CPU bound tasks |
os_CPUSchedAutogroupEnabled | integer | 0 |
| no | Enables the Linux task auto-grouping feature, where the kernel assigns related tasks to groups and schedules them together on CPUs to achieve higher performance for some workloads |
os_CPUSchedNrMigrate | integer | 32 | 3 → 320 | no | Scheduler NR Migrate |
os_MemorySwappiness | integer | percent | 60 | 0 → 100 | no | The percentage of RAM free space for which the kernel will start swapping pages to disk |
os_MemoryVmVfsCachePressure | integer | 100 | 10 → 100 | no | VFS Cache Pressure |
os_MemoryVmCompactionProactiveness | integer | 20 | 10 → 100 | no | Determines how aggressively compaction is done in the background |
os_MemoryVmPageLockUnfairness | integer | 5 | 0 → 1000 | no | Set the level of unfairness in the page lock queue. |
os_MemoryVmWatermarkScaleFactor | integer | 10 | 0 → 1000 | no | The amount of memory, expressed as fractions of 10'000, left in a node/system before kswapd is woken up and how much memory needs to be free before kswapd goes back to sleep |
os_MemoryVmWatermarkBoostFactor | integer | 15000 | 0 → 30000 | no | The level of reclaim when the memory is being fragmented, expressed as fractions of 10'000 of a zone's high watermark |
os_MemoryVmMinFree | integer | 67584 | 10240 → 1024000 | no | Minimum Free Memory (in kbytes) |
os_MemoryTransparentHugepageEnabled | categorical |
|
| no | Transparent Hugepage Enablement Flag |
os_MemoryTransparentHugepageDefrag | categorical |
|
| no | Transparent Hugepage Enablement Defrag |
os_MemorySwap | categorical |
|
| no | Memory Swap |
os_MemoryVmDirtyRatio | integer | 20 | 1 → 99 | no | When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write |
os_MemoryVmDirtyBackgroundRatio | integer | 10 | 1 → 99 | no | When the dirty memory pages exceed this percentage of the total memory, the kernel begins to write them asynchronously in the background |
os_MemoryVmDirtyExpire | integer | centiseconds | 3000 | 300 → 30000 | no | When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write |
os_MemoryVmDirtyWriteback | integer | centiseconds | 500 | 50 → 5000 | no | Memory Dirty Writeback (in centisecs) |
os_NetworkNetCoreSomaxconn | integer | megabytes | 128 | 12 → 8192 | no | Network Max Connections |
os_NetworkNetCoreNetdevMaxBacklog | integer | megabytes/s | 1000 | 100 → 10000 | no | Network Max Backlog |
os_NetworkNetIpv4TcpMaxSynBacklog | integer | milliseconds | 256 | 52 → 5120 | no | Network IPV4 Max Sync Backlog |
os_NetworkNetCoreNetdevBudget | integer | 300 | 30 → 30000 | no | Network Budget |
os_NetworkNetCoreRmemMax | integer | 212992 | 21299 → 2129920 | no | Maximum network receive buffer size that applications can request |
os_NetworkNetCoreWmemMax | integer | 212992 | 21299 → 2129920 | no | Maximum network transmit buffer size that applications can request |
os_NetworkNetIpv4TcpSlowStartAfterIdle | integer | 1 |
| no | Network Slow Start After Idle Flag |
os_NetworkNetIpv4TcpFinTimeout | integer | 60 | 6 → 600 | no | Network TCP timeout |
os_NetworkRfs | integer | 0 | 0 → 131072 | no | If enabled increases datacache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is running |
os_StorageReadAhead | integer | kilobytes | 128 | 0 → 4096 | no | Read-ahead speeds up file access by pre-fetching data and loading it into the page cache so that it can be available earlier in memory instead of from disk |
os_StorageNrRequests | integer | 32 | 12 → 1280 | no | Storage Number of Requests |
os_StorageRqAffinity | integer | 1 |
| no | Storage Requests Affinity |
os_StorageQueueScheduler | integer |
|
| no | Storage Queue Scheduler Type |
os_StorageNomerges | integer | 0 | 0 → 2 | no | Enables the user to disable the lookup logic involved with IO merging requests in the block layer. By default (0) all merges are enabled. With 1 only simple one-hit merges will be tried. With 2 no merge algorithms will be tried |
os_StorageMaxSectorsKb | integer | kilobytes | 256 | 32 → 256 | no | The largest IO size that the OS can issue to a block device |
This page describes the Optimization Pack for the component type CentOS 8.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
Notice: you can use a device custom filter to monitor a specific disk with Prometheus. You can find more information on Prometheus queries and the %FILTERS% placeholder here: Prometheus provider and here: Prometheus provider metrics mapping.
There are no general constraints among RHEL 8 parameters.
This page describes the Optimization Pack for the component type RHEL 7.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
Notice: you can use a device custom filter to monitor a specific disk with Prometheus. You can find more information on Prometheus queries and the %FILTERS% placeholder here: Prometheus provider and here: Prometheus provider metrics mapping.
This page describes the Optimization Pack for the component type RHEL 8.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
Notice: you can use a device custom filter to monitor a specific disk with Prometheus. You can find more information on Prometheus queries and the %FILTERS% placeholder here: Prometheus provider and here: Prometheus provider metrics mapping.
This page describes the Optimization Pack for the component type Ubuntu 16.04.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
Notice: you can use a device custom filter to monitor a specific disk with Prometheus. You can find more information on Prometheus queries and the %FILTERS% placeholder here: Prometheus provider and here: Prometheus provider metrics mapping.
The Java-OpenJDK optimization pack enables the ability to optimize Java applications based on the OpenJDK and Oracle HotSpot JVM. Through this optimization pack, Akamas is able to tackle the problem of performance of JVM-based applications from both the point of view of cost savings and quality of service.
To achieve these goals the optimization pack provides parameters that focus on the following areas:
Garbage collection
Heap
JIT
Similarly, the bundled metrics provide visibility on the following aspects of tuned applications:
Heap and memory utilization
Garbage-collection
Execution threads
The optimization pack supports the most used versions of OpenJDK and Oracle HotSpot JVM.
| Component Type | Description |
|---|
Here’s the command to install the Java OpenJDK optimization pack using the Akamas CLI:
The OpenJ9 optimization pack enables the ability to optimize Java applications based on the Eclipse OpenJ9 VM, formerly known as IBM J9. Through this optimization pack, Akamas is able to tackle the problem of performance of JVM-based applications from both the point of view of cost savings and quality of service.
To achieve these goals the optimization pack provides parameters that focus on the following areas:
Garbage collection
Heap
JIT
Similarly, the bundled metrics provide visibility on the following aspects of tuned applications:
Heap and memory utilization
Garbage Collection
Execution threads
The optimization pack supports the most used versions of JVM.
| Component Type | Description |
|---|
Here’s the command to install the Eclipse OpenJ9 optimization pack using the Akamas CLI:
This page describes the Optimization Pack for Eclipse OpenJ9 (formerly known as IBM J9) Virtual Machine version 6.
| Name | Unit | Description |
|---|
The following parameters require their ranges or default values to be updated according to the described rules:
Notice that the value nocompressedreferences for j9vm_compressedReferences can only be specified for JVMs compiled with the proper --with-noncompressedrefs flag. If this is not the case you cannot actively disable compressed references, meaning:
for Xmx <= 57GB is useless to tune this parameter since compressed references are active by default and it is not possible to explicitly disable it
for Xmx > 57GB, since the by default (blank value) compressed references are disabled, Akamas can try to enable it. This requires removing the nocompressedreferences from the domain
The following tables show a list of constraints that may be required in the definition of the study, depending on the tuned parameters:
Notice that
j9vm_newSpaceFixed is mutually exclusive with j9vm_minNewSpace and j9vm_maxNewSpace
j9vm_oldSpaceFixed is mutually exclusive with j9vm_minOldSpace and j9vm_maxOldSpace
the sum of j9vm_minNewSpace and j9vm_minOldSpace must be equal to j9vm_minHeapSize, so it's useless to tune all of them together. Max values seem to be more complex.
This page describes the Optimization Pack for Eclipse OpenJ9 (formerly known as IBM J9) Virtual Machine version 8.
| Name | Unit | Description |
|---|
The following parameters require their ranges or default values to be updated according to the described rules:
Notice that the value nocompressedreferences for j9vm_compressedReferences can only be specified for JVMs compiled with the proper --with-noncompressedrefs flag. If this is not the case you cannot actively disable compressed references, meaning:
for Xmx <= 57GB is useless to tune this parameter since compressed references are active by default and it is not possible to explicitly disable it
for Xmx > 57GB, since the by default (blank value) compressed references are disabled, Akamas can try to enable it. This requires removing the nocompressedreferences from the domain
The following tables show a list of constraints that may be required in the definition of the study, depending on the tuned parameters:
Notice that
j9vm_newSpaceFixed is mutually exclusive with j9vm_minNewSpace and j9vm_maxNewSpace
j9vm_oldSpaceFixed is mutually exclusive with j9vm_minOldSpace and j9vm_maxOldSpace
the sum of j9vm_minNewSpace and j9vm_minOldSpace must be equal to j9vm_minHeapSize, so it's useless to tune all of them together. Max values seem to be more complex.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default Value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
| Parameter | Default value | Domain | Description |
|---|---|---|---|
For more information on the process of installing or upgrading an optimization pack refer to .\
For more information on the process of installing or upgrading an optimization pack refer to .
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|
| Parameter | Default value | Domain |
|---|
| Formula | Notes |
|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|
| Parameter | Default value | Domain |
|---|
| Formula | Notes |
|---|
cpu_num
CPUs
The number of CPUs available in the system (physical and logical)
cpu_util
percent
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
cpu_util_details
percent
The average CPU utilization % broken down by usage type and cpu number (e.g., cp1 user, cp2 system, cp3 soft-irq)
cpu_load_avg
tasks
The system load average (i.e., the number of active tasks in the system)
mem_util
percent
The memory utilization % (i.e, the % of memory used)
mem_util_nocache
percent
The memory utilization % (i.e., the % of memory used) without considering memory reserved for caching purposes
mem_util_details
percent
The memory utilization % (i.e., the % of memory used) broken down by usage type (e.g., active memory)
mem_used
bytes
The total amount of memory used
mem_used_nocache
bytes
The total amount of memory used without considering memory reserved for caching purposes
mem_total
bytes
The total amount of installed memory
mem_fault_minor
faults/s
The number of minor memory faults (i.e., faults that do not cause disk access) per second
mem_fault_major
faults/s
The number of major memory faults (i.e., faults that cause disk access) per second
mem_fault
faults/s
The number of memory faults (major + minor)
mem_swapins
pages/s
The number of memory pages swapped in per second
mem_swapouts
pages/s
The number of memory pages swapped out per second
network_tcp_retrans
retrans/s
The number of network TCP retransmissions per second
network_in_bytes_details
bytes/s
The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0)
network_out_bytes_details
bytes/s
The number of outbound network packets in bytes per second broken down by network device (e.g., eth01)
disk_swap_util
percent
The average space utilization % of swap disks
disk_swap_used
bytes
The total amount of space used by swap disks
disk_util_details
percent
The utilization % of disk, i.e how much time a disk is busy doing work broken down by disk (e.g., disk D://)
disk_iops_writes
ops/s
The average number of IO disk-write operations per second across all disks
disk_iops_reads
ops/s
The average number of IO disk-read operations per second across all disks
disk_iops
ops/s
The average number of IO disk operations per second across all disks
disk_response_time_read
seconds
The average response time of IO read-disk operations
disk_response_time_worst
seconds
The average response time of IO disk operations of the slowest disk
disk_response_time_write
seconds
The average response time of IO write-disk operations
disk_response_time_details
ops/s
The average response time of IO disk operations broken down by disk (e.g., disk /dev/nvme01 )
disk_iops_details
ops/s
The number of IO disk-write operations of per second broken down by disk (e.g., disk /dev/nvme01)
disk_io_inflight_details
ops
The number of IO disk operations in progress (outstanding) broken down by disk (e.g., disk /dev/nvme01)
disk_write_bytes
bytes/s
The number of bytes per second written across all disks
disk_read_bytes
bytes/s
The number of bytes per second read across all disks
disk_read_write_bytes
bytes/s
The number of bytes per second read and written across all disks
disk_write_bytes_details
bytes/s
The number of bytes per second written from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation WRITE)
disk_read_bytes_details
bytes/s
The number of bytes per second read from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation READ)
filesystem_util
percent
The space utilization % of filesystems broken down by type and device (e.g., filesystem of type overlayfs on device /dev/loop1)
filesystem_used
bytes
The amount of space used on the filesystems broken down by type and device (e.g., filesystem of type zfs on device /dev/nvme01)
filesystem_size
bytes
The size of filesystems broken down by type and device (e.g., filesystem of type ext4 for device /dev/nvme01)
proc_blocked
processes
The number of processes blocked (e.g, for IO or swapping reasons)
os_context_switch
switches/s
The number of context switches per second
os_cpuSchedMinGranularity
2250000 ns
300000→30000000 ns
Minimal preemption granularity (in nanoseconds) for CPU bound tasks
os_cpuSchedWakeupGranularity
3000000 ns
400000→40000000 ns
Scheduler Wakeup Granularity (in nanoseconds)
os_CPUSchedMigrationCost
500000 ns
100000→5000000 ns
Amount of time (in nanoseconds) after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations
os_CPUSchedChildRunsFirst
0
0→1
A freshly forked child runs before the parent continues execution
os_CPUSchedLatency
18000000 ns
2400000→240000000 ns
Targeted preemption latency (in nanoseconds) for CPU bound tasks
os_CPUSchedAutogroupEnabled
1
0→1
Enables the Linux task auto-grouping feature, where the kernel assigns related tasks to groups and schedules them together on CPUs to achieve higher performance for some workloads
os_CPUSchedNrMigrate
32
3→320
Scheduler NR Migrate
os_MemorySwappiness
1
0→100
Memory Swappiness
os_MemoryVmVfsCachePressure
100 %
10→100 %
VFS Cache Pressure
os_MemoryVmMinFree
67584 KB
10240→1024000 KB
Minimum Free Memory
os_MemoryVmDirtyRatio
20 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write
os_MemoryVmDirtyBackgroundRatio
10 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, the kernel begins to write them asynchronously in the background
os_MemoryTransparentHugepageEnabled
never
always never madvise
Transparent Hugepage Enablement
os_MemoryTransparentHugepageDefrag
always
always never madvise defer defer+madvise
Transparent Hugepage Enablement Defrag
os_MemorySwap
swapon
swapon swapoff
Memory Swap
os_MemoryVmDirtyExpire
3000 centisecs
300→30000 centisecs
Memory Dirty Expiration Time
os_MemoryVmDirtyWriteback
500 centisecs
50→5000 centisecs
Memory Dirty Writeback
os_NetworkNetCoreSomaxconn
128 connections
12→1200 connections
Network Max Connections
os_NetworkNetCoreNetdevMaxBacklog
1000 packets
100→10000 packets
Network Max Backlog
os_NetworkNetIpv4TcpMaxSynBacklog
512 packets
52→15120 packets
Network IPV4 Max Sync Backlog
os_NetworkNetCoreNetdevBudget
300 packets
30→3000 packets
Network Budget
os_NetworkNetCoreRmemMax
212992 bytes
21299→2129920 bytes
Maximum network receive buffer size that applications can request
os_NetworkNetCoreWmemMax
21299→2129920 bytes
21299→2129920 bytes
Maximum network transmit buffer size that applications can request
os_NetworkNetIpv4TcpSlowStartAfterIdle
1
0→1
Network Slow Start After Idle Flag
os_NetworkNetIpv4TcpFinTimeout
60
6 →600 seconds
Network TCP timeout
os_NetworkRfs
0
0→131072
If enabled increases datacache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is running
os_StorageReadAhead
128 KB
0→1024 KB
Read-ahead speeds up file access by pre-fetching data and loading it into the page cache so that it can be available earlier in memory instead of from disk
os_StorageNrRequests
1000 packets
100→10000 packets
Network Max Backlog
os_StorageRqAffinity
1
1→2
Storage Requests Affinity
os_StorageQueueScheduler
none
none kyber mq-deadline bfq
Storage Queue Scheduler Type
os_StorageNomerges
0
0→2
Enables the user to disable the lookup logic involved with IO merging requests in the block layer. By default (0) all merges are enabled. With 1 only simple one-hit merges will be tried. With 2 no merge algorithms will be tried
os_StorageMaxSectorsKb
128 KB
32→128 KB
The largest IO size that the OS c
cpu_num
CPUs
The number of CPUs available in the system (physical and logical)
cpu_util
percent
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
cpu_util_details
percent
The average CPU utilization % broken down by usage type and cpu number (e.g., cp1 user, cp2 system, cp3 soft-irq)
cpu_load_avg
tasks
The system load average (i.e., the number of active tasks in the system)
mem_util
percent
The memory utilization % (i.e, the % of memory used)
mem_util_nocache
percent
The memory utilization % (i.e., the % of memory used) without considering memory reserved for caching purposes
mem_util_details
percent
The memory utilization % (i.e., the % of memory used) broken down by usage type (e.g., active memory)
mem_used
bytes
The total amount of memory used
mem_used_nocache
bytes
The total amount of memory used without considering memory reserved for caching purposes
mem_total
bytes
The total amount of installed memory
mem_fault_minor
faults/s
The number of minor memory faults (i.e., faults that do not cause disk access) per second
mem_fault_major
faults/s
The number of major memory faults (i.e., faults that cause disk access) per second
mem_fault
faults/s
The number of memory faults (major + minor)
mem_swapins
pages/s
The number of memory pages swapped in per second
mem_swapouts
pages/s
The number of memory pages swapped out per second
network_tcp_retrans
retrans/s
The number of network TCP retransmissions per second
network_in_bytes_details
bytes/s
The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0)
network_out_bytes_details
bytes/s
The number of outbound network packets in bytes per second broken down by network device (e.g., eth01)
disk_swap_util
percent
The average space utilization % of swap disks
disk_swap_used
bytes
The total amount of space used by swap disks
disk_util_details
percent
The utilization % of disk, i.e how much time a disk is busy doing work broken down by disk (e.g., disk D://)
disk_iops_writes
ops/s
The average number of IO disk-write operations per second across all disks
disk_iops_reads
ops/s
The average number of IO disk-read operations per second across all disks
disk_iops
ops/s
The average number of IO disk operations per second across all disks
disk_response_time_read
seconds
The average response time of IO read-disk operations
disk_response_time_worst
seconds
The average response time of IO disk operations of the slowest disk
disk_response_time_write
seconds
The average response time of IO write-disk operations
disk_response_time_details
ops/s
The average response time of IO disk operations broken down by disk (e.g., disk /dev/nvme01 )
disk_iops_details
ops/s
The number of IO disk-write operations of per second broken down by disk (e.g., disk /dev/nvme01)
disk_io_inflight_details
ops
The number of IO disk operations in progress (outstanding) broken down by disk (e.g., disk /dev/nvme01)
disk_write_bytes
bytes/s
The number of bytes per second written across all disks
disk_read_bytes
bytes/s
The number of bytes per second read across all disks
disk_read_write_bytes
bytes/s
The number of bytes per second read and written across all disks
disk_write_bytes_details
bytes/s
The number of bytes per second written from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation WRITE)
disk_read_bytes_details
bytes/s
The number of bytes per second read from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation READ)
filesystem_util
percent
The space utilization % of filesystems broken down by type and device (e.g., filesystem of type overlayfs on device /dev/loop1)
filesystem_used
bytes
The amount of space used on the filesystems broken down by type and device (e.g., filesystem of type zfs on device /dev/nvme01)
filesystem_size
bytes
The size of filesystems broken down by type and device (e.g., filesystem of type ext4 for device /dev/nvme01)
proc_blocked
processes
The number of processes blocked (e.g, for IO or swapping reasons)
os_context_switch
switches/s
The number of context switches per second
os_cpuSchedMinGranularity
2250000 ns
300000→30000000 ns
Minimal preemption granularity (in nanoseconds) for CPU bound tasks
os_cpuSchedWakeupGranularity
3000000 ns
400000→40000000 ns
Scheduler Wakeup Granularity (in nanoseconds)
os_CPUSchedMigrationCost
500000 ns
100000→5000000 ns
Amount of time (in nanoseconds) after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations
os_CPUSchedChildRunsFirst
0
0→1
A freshly forked child runs before the parent continues execution
os_CPUSchedLatency
18000000 ns
2400000→240000000 ns
Targeted preemption latency (in nanoseconds) for CPU bound tasks
os_CPUSchedAutogroupEnabled
1
0→1
Enables the Linux task auto-grouping feature, where the kernel assigns related tasks to groups and schedules them together on CPUs to achieve higher performance for some workloads
os_CPUSchedNrMigrate
32
3→320
Scheduler NR Migrate
os_MemorySwappiness
1
0→100
Memory Swappiness
os_MemoryVmVfsCachePressure
100 %
10→100 %
VFS Cache Pressure
os_MemoryVmMinFree
67584 KB
10240→1024000 KB
Minimum Free Memory
os_MemoryVmDirtyRatio
20 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write
os_MemoryVmDirtyBackgroundRatio
10 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, the kernel begins to write them asynchronously in the background
os_MemoryTransparentHugepageEnabled
always
always never
Transparent Hugepage Enablement
os_MemoryTransparentHugepageDefrag
always
always never
Transparent Hugepage Enablement Defrag
os_MemorySwap
swapon
swapon swapoff
Memory Swap
os_MemoryVmDirtyExpire
3000 centisecs
300→30000 centisecs
Memory Dirty Expiration Time
os_MemoryVmDirtyWriteback
500 centisecs
50→5000 centisecs
Memory Dirty Writeback
os_NetworkNetCoreSomaxconn
128 connections
12→1200 connections
Network Max Connections
os_NetworkNetCoreNetdevMaxBacklog
1000 packets
100→10000 packets
Network Max Backlog
os_NetworkNetIpv4TcpMaxSynBacklog
1024 packets
52→15120 packets
Network IPV4 Max Sync Backlog
os_NetworkNetCoreNetdevBudget
300 packets
30→3000 packets
Network Budget
os_NetworkNetCoreRmemMax
212992 bytes
21299→2129920 bytes
Maximum network receive buffer size that applications can request
os_NetworkNetCoreWmemMax
21299→2129920 bytes
21299→2129920 bytes
Maximum network transmit buffer size that applications can request
os_NetworkNetIpv4TcpSlowStartAfterIdle
1
0→1
Network Slow Start After Idle Flag
os_NetworkNetIpv4TcpFinTimeout
60
6 →600 seconds
Network TCP timeout
os_NetworkRfs
0
0→131072
If enabled increases datacache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is running
os_StorageReadAhead
128 KB
0→1024 KB
Read-ahead speeds up file access by pre-fetching data and loading it into the page cache so that it can be available earlier in memory instead of from disk
os_StorageNrRequests
1000 packets
100→10000 packets
Network Max Backlog
os_StorageRqAffinity
1
1→2
Storage Requests Affinity
os_StorageQueueScheduler
none
none kyber
Storage Queue Scheduler Type
os_StorageNomerges
0
0→2
Enables the user to disable the lookup logic involved with IO merging requests in the block layer. By default (0) all merges are enabled. With 1 only simple one-hit merges will be tried. With 2 no merge algorithms will be tried
os_StorageMaxSectorsKb
128 KB
32→128 KB
The largest IO size that the OS c
MS .NET 3.1
cpu_num
CPUs
The number of CPUs available in the system (physical and logical)
cpu_util
percent
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
cpu_util_details
percent
The average CPU utilization % broken down by usage type and cpu number (e.g., cp1 user, cp2 system, cp3 soft-irq)
cpu_load_avg
tasks
The system load average (i.e., the number of active tasks in the system)
mem_util
percent
The memory utilization % (i.e, the % of memory used)
mem_util_nocache
percent
The memory utilization % (i.e., the % of memory used) without considering memory reserved for caching purposes
mem_util_details
percent
The memory utilization % (i.e., the % of memory used) broken down by usage type (e.g., active memory)
mem_used
bytes
The total amount of memory used
mem_used_nocache
bytes
The total amount of memory used without considering memory reserved for caching purposes
mem_total
bytes
The total amount of installed memory
mem_fault_minor
faults/s
The number of minor memory faults (i.e., faults that do not cause disk access) per second
mem_fault_major
faults/s
The number of major memory faults (i.e., faults that cause disk access) per second
mem_fault
faults/s
The number of memory faults (major + minor)
mem_swapins
pages/s
The number of memory pages swapped in per second
mem_swapouts
pages/s
The number of memory pages swapped out per second
network_tcp_retrans
retrans/s
The number of network TCP retransmissions per second
network_in_bytes_details
bytes/s
The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0)
network_out_bytes_details
bytes/s
The number of outbound network packets in bytes per second broken down by network device (e.g., eth01)
disk_swap_util
percent
The average space utilization % of swap disks
disk_swap_used
bytes
The total amount of space used by swap disks
disk_util_details
percent
The utilization % of disk, i.e how much time a disk is busy doing work broken down by disk (e.g., disk D://)
disk_iops_writes
ops/s
The average number of IO disk-write operations per second across all disks
disk_iops_reads
ops/s
The average number of IO disk-read operations per second across all disks
disk_iops
ops/s
The average number of IO disk operations per second across all disks
disk_response_time_read
seconds
The average response time of IO read-disk operations
disk_response_time_worst
seconds
The average response time of IO disk operations of the slowest disk
disk_response_time_write
seconds
The average response time of IO write-disk operations
disk_response_time_details
ops/s
The average response time of IO disk operations broken down by disk (e.g., disk /dev/nvme01 )
disk_iops_details
ops/s
The number of IO disk-write operations of per second broken down by disk (e.g., disk /dev/nvme01)
disk_io_inflight_details
ops
The number of IO disk operations in progress (outstanding) broken down by disk (e.g., disk /dev/nvme01)
disk_write_bytes
bytes/s
The number of bytes per second written across all disks
disk_read_bytes
bytes/s
The number of bytes per second read across all disks
disk_read_write_bytes
bytes/s
The number of bytes per second read and written across all disks
disk_write_bytes_details
bytes/s
The number of bytes per second written from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation WRITE)
disk_read_bytes_details
bytes/s
The number of bytes per second read from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation READ)
filesystem_util
percent
The space utilization % of filesystems broken down by type and device (e.g., filesystem of type overlayfs on device /dev/loop1)
filesystem_used
bytes
The amount of space used on the filesystems broken down by type and device (e.g., filesystem of type zfs on device /dev/nvme01)
filesystem_size
bytes
The size of filesystems broken down by type and device (e.g., filesystem of type ext4 for device /dev/nvme01)
proc_blocked
processes
The number of processes blocked (e.g, for IO or swapping reasons)
os_context_switch
switches/s
The number of context switches per second
os_cpuSchedMinGranularity
2250000 ns
300000→30000000 ns
Minimal preemption granularity (in nanoseconds) for CPU bound tasks
os_cpuSchedWakeupGranularity
3000000 ns
400000→40000000 ns
Scheduler Wakeup Granularity (in nanoseconds)
os_CPUSchedMigrationCost
500000 ns
100000→5000000 ns
Amount of time (in nanoseconds) after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations
os_CPUSchedChildRunsFirst
0
0→1
A freshly forked child runs before the parent continues execution
os_CPUSchedLatency
18000000 ns
2400000→240000000 ns
Targeted preemption latency (in nanoseconds) for CPU bound tasks
os_CPUSchedAutogroupEnabled
1
0→1
Enables the Linux task auto-grouping feature, where the kernel assigns related tasks to groups and schedules them together on CPUs to achieve higher performance for some workloads
os_CPUSchedNrMigrate
32
3→320
Scheduler NR Migrate
os_MemorySwappiness
30
0→100
Memory Swappiness
os_MemoryVmVfsCachePressure
100 %
10→100 %
VFS Cache Pressure
os_MemoryVmMinFree
67584 KB
10240→1024000 KB
Minimum Free Memory
os_MemoryVmDirtyRatio
30 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write
os_MemoryVmDirtyBackgroundRatio
10 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, the kernel begins to write them asynchronously in the background
os_MemoryTransparentHugepageEnabled
never
always never madvise
Transparent Hugepage Enablement
os_MemoryTransparentHugepageDefrag
always
always never madvise defer defer+madvise
Transparent Hugepage Enablement Defrag
os_MemorySwap
swapon
swapon swapoff
Memory Swap
os_MemoryVmDirtyExpire
3000 centisecs
300→30000 centisecs
Memory Dirty Expiration Time
os_MemoryVmDirtyWriteback
500 centisecs
50→5000 centisecs
Memory Dirty Writeback
os_NetworkNetCoreSomaxconn
128 connections
12→1200 connections
Network Max Connections
os_NetworkNetCoreNetdevMaxBacklog
1000 packets
100→10000 packets
Network Max Backlog
os_NetworkNetIpv4TcpMaxSynBacklog
512 packets
52→15120 packets
Network IPV4 Max Sync Backlog
os_NetworkNetCoreNetdevBudget
300 packets
30→3000 packets
Network Budget
os_NetworkNetCoreRmemMax
212992 bytes
21299→2129920 bytes
Maximum network receive buffer size that applications can request
os_NetworkNetCoreWmemMax
21299→2129920 bytes
21299→2129920 bytes
Maximum network transmit buffer size that applications can request
os_NetworkNetIpv4TcpSlowStartAfterIdle
1
0→1
Network Slow Start After Idle Flag
os_NetworkNetIpv4TcpFinTimeout
60
6 →600 seconds
Network TCP timeout
os_NetworkRfs
0
0→131072
If enabled increases datacache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is running
os_StorageReadAhead
128 KB
0→1024 KB
Read-ahead speeds up file access by pre-fetching data and loading it into the page cache so that it can be available earlier in memory instead of from disk
os_StorageNrRequests
1000 packets
100→10000 packets
Network Max Backlog
os_StorageRqAffinity
1
1→2
Storage Requests Affinity
os_StorageQueueScheduler
none
none kyber mq-deadline bfq
Storage Queue Scheduler Type
os_StorageNomerges
0
0→2
Enables the user to disable the lookup logic involved with IO merging requests in the block layer. By default (0) all merges are enabled. With 1 only simple one-hit merges will be tried. With 2 no merge algorithms will be tried
os_StorageMaxSectorsKb
256 KB
32→256 KB
The largest IO size that the OS c
cpu_num
CPUs
The number of CPUs available in the system (physical and logical)
cpu_util
percent
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
cpu_util_details
percent
The average CPU utilization % broken down by usage type and cpu number (e.g., cp1 user, cp2 system, cp3 soft-irq)
cpu_load_avg
tasks
The system load average (i.e., the number of active tasks in the system)
mem_util
percent
The memory utilization % (i.e, the % of memory used)
mem_util_nocache
percent
The memory utilization % (i.e., the % of memory used) without considering memory reserved for caching purposes
mem_util_details
percent
The memory utilization % (i.e., the % of memory used) broken down by usage type (e.g., active memory)
mem_used
bytes
The total amount of memory used
mem_used_nocache
bytes
The total amount of memory used without considering memory reserved for caching purposes
mem_total
bytes
The total amount of installed memory
mem_fault_minor
faults/s
The number of minor memory faults (i.e., faults that do not cause disk access) per second
mem_fault_major
faults/s
The number of major memory faults (i.e., faults that cause disk access) per second
mem_fault
faults/s
The number of memory faults (major + minor)
mem_swapins
pages/s
The number of memory pages swapped in per second
mem_swapouts
pages/s
The number of memory pages swapped out per second
network_tcp_retrans
retrans/s
The number of network TCP retransmissions per second
network_in_bytes_details
bytes/s
The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0)
network_out_bytes_details
bytes/s
The number of outbound network packets in bytes per second broken down by network device (e.g., eth01)
disk_swap_util
percent
The average space utilization % of swap disks
disk_swap_used
bytes
The total amount of space used by swap disks
disk_util_details
percent
The utilization % of disk, i.e how much time a disk is busy doing work broken down by disk (e.g., disk D://)
disk_iops_writes
ops/s
The average number of IO disk-write operations per second across all disks
disk_iops_reads
ops/s
The average number of IO disk-read operations per second across all disks
disk_iops
ops/s
The average number of IO disk operations per second across all disks
disk_response_time_read
seconds
The average response time of IO read-disk operations
disk_response_time_worst
seconds
The average response time of IO disk operations of the slowest disk
disk_response_time_write
seconds
The average response time of IO write-disk operations
disk_response_time_details
ops/s
The average response time of IO disk operations broken down by disk (e.g., disk /dev/nvme01 )
disk_iops_details
ops/s
The number of IO disk-write operations of per second broken down by disk (e.g., disk /dev/nvme01)
disk_io_inflight_details
ops
The number of IO disk operations in progress (outstanding) broken down by disk (e.g., disk /dev/nvme01)
disk_write_bytes
bytes/s
The number of bytes per second written across all disks
disk_read_bytes
bytes/s
The number of bytes per second read across all disks
disk_read_write_bytes
bytes/s
The number of bytes per second read and written across all disks
disk_write_bytes_details
bytes/s
The number of bytes per second written from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation WRITE)
disk_read_bytes_details
bytes/s
The number of bytes per second read from the disks broken down by disk and type of operation (e.g., disk /dev/nvme01 and operation READ)
filesystem_util
percent
The space utilization % of filesystems broken down by type and device (e.g., filesystem of type overlayfs on device /dev/loop1)
filesystem_used
bytes
The amount of space used on the filesystems broken down by type and device (e.g., filesystem of type zfs on device /dev/nvme01)
filesystem_size
bytes
The size of filesystems broken down by type and device (e.g., filesystem of type ext4 for device /dev/nvme01)
proc_blocked
processes
The number of processes blocked (e.g, for IO or swapping reasons)
os_context_switch
switches/s
The number of context switches per second
os_cpuSchedMinGranularity
2250000 ns
300000→30000000 ns
Minimal preemption granularity (in nanoseconds) for CPU bound tasks
os_cpuSchedWakeupGranularity
3000000 ns
400000→40000000 ns
Scheduler Wakeup Granularity (in nanoseconds)
os_CPUSchedMigrationCost
500000 ns
100000→5000000 ns
Amount of time (in nanoseconds) after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations
os_CPUSchedChildRunsFirst
0
0→1
A freshly forked child runs before the parent continues execution
os_CPUSchedLatency
18000000 ns
2400000→240000000 ns
Targeted preemption latency (in nanoseconds) for CPU bound tasks
os_CPUSchedAutogroupEnabled
1
0→1
Enables the Linux task auto-grouping feature, where the kernel assigns related tasks to groups and schedules them together on CPUs to achieve higher performance for some workloads
os_CPUSchedNrMigrate
32
3→320
Scheduler NR Migrate
os_MemorySwappiness
1
0→100
Memory Swappiness
os_MemoryVmVfsCachePressure
100 %
10→100 %
VFS Cache Pressure
os_MemoryVmMinFree
67584 KB
10240→1024000 KB
Minimum Free Memory
os_MemoryVmDirtyRatio
20 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, processes are forced to write dirty buffers during their time slice instead of continuing to write
os_MemoryVmDirtyBackgroundRatio
10 %
1→99 %
When the dirty memory pages exceed this percentage of the total memory, the kernel begins to write them asynchronously in the background
os_MemoryTransparentHugepageEnabled
always
always never
Transparent Hugepage Enablement
os_MemoryTransparentHugepageDefrag
always
always never
Transparent Hugepage Enablement Defrag
os_MemorySwap
swapon
swapon swapoff
Memory Swap
os_MemoryVmDirtyExpire
3000 centisecs
300→30000 centisecs
Memory Dirty Expiration Time
os_MemoryVmDirtyWriteback
500 centisecs
50→5000 centisecs
Memory Dirty Writeback
os_NetworkNetCoreSomaxconn
128 connections
12→1200 connections
Network Max Connections
os_NetworkNetCoreNetdevMaxBacklog
1000 packets
100→10000 packets
Network Max Backlog
os_NetworkNetIpv4TcpMaxSynBacklog
1024 packets
52→15120 packets
Network IPV4 Max Sync Backlog
os_NetworkNetCoreNetdevBudget
300 packets
30→3000 packets
Network Budget
os_NetworkNetCoreRmemMax
212992 bytes
21299→2129920 bytes
Maximum network receive buffer size that applications can request
os_NetworkNetCoreWmemMax
21299→2129920 bytes
21299→2129920 bytes
Maximum network transmit buffer size that applications can request
os_NetworkNetIpv4TcpSlowStartAfterIdle
1
0→1
Network Slow Start After Idle Flag
os_NetworkNetIpv4TcpFinTimeout
60
6 →600 seconds
Network TCP timeout
os_NetworkRfs
0
0→131072
If enabled increases datacache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is running
os_StorageReadAhead
128 KB
0→1024 KB
Read-ahead speeds up file access by pre-fetching data and loading it into the page cache so that it can be available earlier in memory instead of from disk
os_StorageNrRequests
1000 packets
100→10000 packets
Network Max Backlog
os_StorageRqAffinity
1
1→2
Storage Requests Affinity
os_StorageQueueScheduler
none
none kyber
Storage Queue Scheduler Type
os_StorageNomerges
0
0→2
Enables the user to disable the lookup logic involved with IO merging requests in the block layer. By default (0) all merges are enabled. With 1 only simple one-hit merges will be tried. With 2 no merge algorithms will be tried
os_StorageMaxSectorsKb
128 KB
32→128 KB
The largest IO size that the OS c
gc_count
collections/s
The total number of garbage collections
gc_duration
seconds
The garbage collection duration
heap_hard_limit
bytes
The size of the heap
csproj_System_GC_Server
categorical
CPUs
false
true, false
yes
The main flavor of the GC: set it to false for workstation GC or true for server GC. To be set in csproj file and requires rebuild.
csproj_System_GC_Concurrent
categorical
boolean
true
true, false
yes
Configures whether background (concurrent) garbage collection is enabled (setting to true). To be set in csproj file and requires rebuild.
runtime_System_GC_Server
categorical
boolean
false
true, false
yes
The main flavor of the GC: set it to false for workstation GC or true for server GC. To be set in csproj file and requires rebuild.
runtime_System_GC_Concurrent
categorical
boolean
true
true, false
yes
Configures whether background (concurrent) garbage collection is enabled (setting to true). To be set in csproj file and requires rebuild.
runtime_System_GC_HeapCount
integer
heapcount
8
1 → 1000
no
Limits the number of heaps created by the garbage collector. To be set in runtimeconfig.json in runtimeOptions: configProperties
runtime_System_GC_CpuGroup
categorical
boolean
0
1, 0
no
Configures whether the garbage collector uses CPU groups or not. Default is false. To be set in runtimeconfig.json
runtime_System_GC_NoAffinitize
categorical
boolean
false
true, false
no
Specifies whether to affinitize garbage collection threads with processors. To affinitize a GC thread means that it can only run on its specific CPU. To be set in runtimeconfig.json in runtimeOptions: configProperties
runtime_System_GC_HeapHardLimit
integer
bytes
20971520
16777216 → 1099511627776
no
Specifies the maximum commit size, in bytes, for the GC heap and GC bookkeeping. To be set in runtimeconfig.json in runtimeOptions: configProperties
runtime_System_GC_HeapHardLimitPercent
real
percent
0.75
0.1 → 100.0
no
Specifies the allowable GC heap usage as a percentage of the total physical memory. To be set in runtimeconfig.json in runtimeOptions: configProperties.
runtime_System_GC_HighMemoryPercent
integer
bytes
20971520
16777216 → 1099511627776
no
Specify the memory threshold that triggers the execution of a garbage collection. To be set in runtimeconfig.json.
runtime_System_GC_RetainVM
categorical
boolean
false
true, false
no
Configures whether segments that should be deleted are put on a standby list for future use or are released back to the operating system (OS). Default is false. To be set in runtimeconfig.json in runtimeOptions: configProperties
runtime_System_GC_LOHThreshold
integer
bytes
85000
850000 → 1099511627776
no
Specifies the threshold size, in bytes, that causes objects to go on the large object heap (LOH). To be set in runtimeconfig.json in runtimeOptions: configProperties
webconf_maxconnection
integer
connections
2
2 → 1000
no
This setting controls the maximum number of outgoing HTTP connections that you can initiate from a client. To be set in web.config (target app only) or machine.config (global)
webconf_maxIoThreads
integer
threads
20
20 → 1000
no
Controls the maximum number of I/O threads in the .NET thread pool. Automatically multiplied by the number of available CPUs. To be set in web.config (target app only) or machine.config (global). It requires autoConfig=false
webconf_minIoThreads
integer
threads
20
20 → 1000
no
The minIoThreads setting enable you to configure a minimum number of worker threads and I/O threads for load conditions. To be set in web.config (target app only) or machine.config (global). It requires autoConfig=false
webconf_maxWorkerThreads
integer
threads
20
20 → 1000
no
This setting controls the maximum number of worker threads in the thread pool. This number is then automatically multiplied by the number of available CPUs.To be set in web.config (target app only) or machine.config (global).It requires autoConfig=false
webconf_minWorkerThreads
integer
threads
20
20 → 1000
no
The minWorkerThreads setting enable you to configure a minimum number of worker threads and I/O threads for load conditions. To be set in web.config (target app only) or machine.config (global). It requires autoConfig=false
webconf_minFreeThreads
integer
threads
8
8 → 800
no
Used by the worker process to queue all the incoming requests if the number of available threads in the thread pool falls below its value. To be set in web.config (target app only) or machine.config (global). It requires autoConfig=false
webconf_minLocalRequestFreeThreads
integer
threads
4
4 → 7600
no
Used to queue requests from localhost (where a Web application sends requests to a local Web service) if the number of available threads falls below it. To be set in web.config (target app only) or machine.config (global). It requires autoConfig=false
webconf_autoConfig
categori
boolean
true
true, false
no
Enable settings the system.web configuration parameters. To be set in web.config (target app only) or machine.config (global)
jvm_heap_size | bytes | The size of the JVM heap memory |
jvm_heap_used | bytes | The amount of heap memory used |
jvm_heap_util | percent | The utilization % of heap memory |
jvm_memory_used | bytes | The total amount of memory used across all the JVM memory pools |
jvm_memory_used_details | bytes | The total amount of memory used broken down by pool (e.g., code-cache, compressed-class-space) |
jvm_memory_buffer_pool_used | bytes | The total amount of bytes used by buffers within the JVM buffer memory pool |
jvm_gc_time | percent | The % of wall clock time the JVM spent doing stop the world garbage collection activities |
jvm_gc_time_details | percent | The % of wall clock time the JVM spent doing stop the world garbage collection activities broken down by type of garbage collection algorithm (e.g., ParNew) |
jvm_gc_count | collections/s | The total number of stop the world JVM garbage collections that have occurred per second |
jvm_gc_count_details | collections/s | The total number of stop the world JVM garbage collections that have occurred per second, broken down by type of garbage collection algorithm (e.g., G1, CMS) |
jvm_gc_duration | seconds | The average duration of a stop the world JVM garbage collection |
jvm_gc_duration_details | seconds | The average duration of a stop the world JVM garbage collection broken down by type of garbage collection algorithm (e.g., G1, CMS) |
jvm_threads_current | threads | The total number of active threads within the JVM |
jvm_threads_deadlocked | threads | The total number of deadlocked threads within the JVM |
jvm_compilation_time | milliseconds | The total time spent by the JVM JIT compiler compiling bytecode |
j9vm_minHeapSize | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | Minimum heap size (in megabytes) |
j9vm_maxHeapSize | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | Maximum heap size (in megabytes) |
j9vm_minFreeHeap | real | percent |
|
| yes | Specify the minimum % free heap required after global GC |
j9vm_maxFreeHeap | real | percent |
|
| yes | Specify the maximum % free heap required after global GC |
j9vm_gcPolicy | categorical |
|
|
| yes | GC policy to use |
j9vm_gcThreads | integer | threads | You should select your own default value. |
| yes | Number of threads the garbage collector uses for parallel operations |
j9vm_scvTenureAge | integer |
|
|
| yes | Set the initial tenuring threshold for generational concurrent GC policy |
j9vm_scvAdaptiveTenureAge | categorical |
| blank | blank, | yes | Enable the adaptive tenure age for generational concurrent GC policy |
j9vm_newSpaceFixed | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The fixed size of the new area when using the gencon GC policy. Must not be set alongside min or max |
j9vm_minNewSpace | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The initial size of the new area when using the gencon GC policy |
j9vm_maxNewSpace | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The maximum size of the new area when using the gencon GC policy |
j9vm_oldSpaceFixed | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The fixed size of the old area when using the gencon GC policy. Must not be set alongside min or max |
j9vm_minOldSpace | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The initial size of the old area when using the gencon GC policy |
j9vm_maxOldSpace | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The maximum size of the old area when using the gencon GC policy |
j9vm_concurrentScavenge | categorical |
|
|
| yes | Support pause-less garbage collection mode with gencon |
j9vm_gcPartialCompact | categorical |
|
|
| yes | Enable partial compaction |
j9vm_concurrentMeter | categorical |
|
|
| yes | Determine which area is monitored by the concurrent mark |
j9vm_concurrentBackground | integer |
|
|
| yes | The number of background threads assisting the mutator threads in concurrent mark |
j9vm_concurrentSlack | integer | megabytes |
| You should select your own domain. | yes | The target size of free heap space for concurrent collectors |
j9vm_concurrentLevel | integer | percent |
|
| yes | The ratio between the amount of heap allocated and the amount of heap marked |
j9vm_gcCompact | categorical |
| blank | blank, | yes | Enables full compaction on all garbage collections (system and global) |
j9vm_minGcTime | real | percent |
|
| yes | The minimum percentage of time to be spent in garbage collection, triggering the resize of the heap to meet the specified values |
j9vm_maxGcTime | real | percent |
|
| yes | The maximum percentage of time to be spent in garbage collection, triggering the resize of the heap to meet the specified values |
j9vm_loa | categorical |
|
|
| yes | Enable the allocation of the large area object during garbage collection |
j9vm_loa_initial | real |
|
|
| yes | The initial portion of the tenure area allocated to the large area object |
j9vm_loa_minimum | real |
|
|
| yes | The minimum portion of the tenure area allocated to the large area object |
j9vm_loa_maximum | real |
|
|
| yes | The maximum portion of the tenure area allocated to the large area object |
j9vm_jitOptlevel | ordinal |
|
|
| yes | Force the JIT compiler to compile all methods at a specific optimization level |
j9vm_codeCacheTotal | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | Maximum size limit in MB for the JIT code cache |
j9vm_jit_count | integer |
|
|
| yes | The number of times a method is called before it is compiled |
j9vm_compressedReferences | categorical |
| blank | blank, | yes | Enable/disable the use of compressed references |
j9vm_aggressiveOpts | categorical |
| blank | blank, | yes | Enable the use of aggressive performance optimization features, which are expected to become default in upcoming releases |
j9vm_virtualized | categorical |
| blank | blank, | yes | Optimize the VM for virtualized environment, reducing CPU usage when idle |
j9vm_shareclasses | categorical |
| blank | blank, | yes | Enable class sharing |
j9vm_quickstart | categorical |
| blank | blank, | yes | Run JIT with only a subset of optimizations, improving the performance of short-running applications |
j9vm_minimizeUserCpu | categorical |
| blank | blank, | yes | Minimizes user-mode CPU usage in thread synchronization where possible |
j9vm_minNewSpace | 25% of | must not exceed |
j9vm_maxNewSpace | 25% of j9vm_maxHeapSize | must not exceed |
j9vm_minOldSpace | 75% of j9vm_minHeapSize | must not exceed |
j9vm_maxOldSpace | same as j9vm_maxHeapSize | must not exceed |
j9vm_gcthreads | number of CPUs - 1, up to a maximum of 64 | capped to default, no benefit in exceeding that value |
j9vm_compressedReferences | enabled for j9vm_maxHeapSize<= 57 GB |
|
jvm.j9vm_minHeapSize < jvm.j9vm_maxHeapSize |
|
jvm.j9vm_minNewSpace < jvm.j9vm_maxNewSpace && jvm.j9vm_minNewSpace < jvm.j9vm_minHeapSize && jvm.j9vm_maxNewSpace < jvm.j9vm_maxHeapSize |
|
jvm.j9vm_minOldSpace < jvm.j9vm_maxOldSpace && jvm.j9vm_minOldSpace < jvm.j9vm_minHeapSize && jvm.j9vm_maxOldSpace < jvm.j9vm_maxHeapSize |
|
jvm.j9vm_loa_minimum <= jvm.j9vm_loa_initial && jvm.j9vm_loa_initial <= jvm.j9vm_loa_maximum |
|
jvm.j9vm_minFreeHeap + 0.05 < jvm.j9vm_maxFreeHeap |
|
jvm.j9vm_minGcTimeMin < jvm.j9vm_maxGcTime |
|
jvm_heap_size | bytes | The size of the JVM heap memory |
jvm_heap_used | bytes | The amount of heap memory used |
jvm_heap_util | percent | The utilization % of heap memory |
jvm_memory_used | bytes | The total amount of memory used across all the JVM memory pools |
jvm_memory_used_details | bytes | The total amount of memory used broken down by pool (e.g., code-cache, compressed-class-space) |
jvm_memory_buffer_pool_used | bytes | The total amount of bytes used by buffers within the JVM buffer memory pool |
jvm_gc_time | percent | The % of wall clock time the JVM spent doing stop the world garbage collection activities |
jvm_gc_time_details | percent | The % of wall clock time the JVM spent doing stop the world garbage collection activities broken down by type of garbage collection algorithm (e.g., ParNew) |
jvm_gc_count | collections/s | The total number of stop the world JVM garbage collections that have occurred per second |
jvm_gc_count_details | collections/s | The total number of stop the world JVM garbage collections that have occurred per second, broken down by type of garbage collection algorithm (e.g., G1, CMS) |
jvm_gc_duration | seconds | The average duration of a stop the world JVM garbage collection |
jvm_gc_duration_details | seconds | The average duration of a stop the world JVM garbage collection broken down by type of garbage collection algorithm (e.g., G1, CMS) |
jvm_threads_current | threads | The total number of active threads within the JVM |
jvm_threads_deadlocked | threads | The total number of deadlocked threads within the JVM |
jvm_compilation_time | milliseconds | The total time spent by the JVM JIT compiler compiling bytecode |
j9vm_minHeapSize | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | Minimum heap size (in megabytes) |
j9vm_maxHeapSize | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | Maximum heap size (in megabytes) |
j9vm_minFreeHeap | real | percent |
|
| yes | Specify the minimum % free heap required after global GC |
j9vm_maxFreeHeap | real | percent |
|
| yes | Specify the maximum % free heap required after global GC |
j9vm_gcPolicy | categorical |
|
|
| yes | GC policy to use |
j9vm_gcThreads | integer | threads | You should select your own default value. |
| yes | Number of threads the garbage collector uses for parallel operations |
j9vm_scvTenureAge | integer |
|
|
| yes | Set the initial tenuring threshold for generational concurrent GC policy |
j9vm_scvAdaptiveTenureAge | categorical |
| blank | blank, | yes | Enable the adaptive tenure age for generational concurrent GC policy |
j9vm_newSpaceFixed | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The fixed size of the new area when using the gencon GC policy. Must not be set alongside min or max |
j9vm_minNewSpace | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The initial size of the new area when using the gencon GC policy |
j9vm_maxNewSpace | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The maximum size of the new area when using the gencon GC policy |
j9vm_oldSpaceFixed | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The fixed size of the old area when using the gencon GC policy. Must not be set alongside min or max |
j9vm_minOldSpace | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The initial size of the old area when using the gencon GC policy |
j9vm_maxOldSpace | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | The maximum size of the old area when using the gencon GC policy |
j9vm_concurrentScavenge | categorical |
|
|
| yes | Support pause-less garbage collection mode with gencon |
j9vm_gcPartialCompact | categorical |
|
|
| yes | Enable partial compaction |
j9vm_concurrentMeter | categorical |
|
|
| yes | Determine which area is monitored by the concurrent mark |
j9vm_concurrentBackground | integer |
|
|
| yes | The number of background threads assisting the mutator threads in concurrent mark |
j9vm_concurrentSlack | integer | megabytes |
| You should select your own domain. | yes | The target size of free heap space for concurrent collectors |
j9vm_concurrentLevel | integer | percent |
|
| yes | The ratio between the amount of heap allocated and the amount of heap marked |
j9vm_gcCompact | categorical |
| blank | blank, | yes | Enables full compaction on all garbage collections (system and global) |
j9vm_minGcTime | real | percent |
|
| yes | The minimum percentage of time to be spent in garbage collection, triggering the resize of the heap to meet the specified values |
j9vm_maxGcTime | real | percent |
|
| yes | The maximum percentage of time to be spent in garbage collection, triggering the resize of the heap to meet the specified values |
j9vm_loa | categorical |
|
|
| yes | Enable the allocation of the large area object during garbage collection |
j9vm_loa_initial | real |
|
|
| yes | The initial portion of the tenure area allocated to the large area object |
j9vm_loa_minimum | real |
|
|
| yes | The minimum portion of the tenure area allocated to the large area object |
j9vm_loa_maximum | real |
|
|
| yes | The maximum portion of the tenure area allocated to the large area object |
j9vm_jitOptlevel | ordinal |
|
|
| yes | Force the JIT compiler to compile all methods at a specific optimization level |
j9vm_compilationThreads | integer | integer | You should select your own default value. |
| yes | Number of JIT threads |
j9vm_codeCacheTotal | integer | megabytes | You should select your own default value. | You should select your own domain. | yes | Maximum size limit in MB for the JIT code cache |
j9vm_jit_count | integer |
|
|
| yes | The number of times a method is called before it is compiled |
j9vm_lockReservation | categorical | categorical | blank, | no | Enables an optimization that presumes a monitor is owned by the thread that last acquired it |
j9vm_compressedReferences | categorical |
| blank | blank, | yes | Enable/disable the use of compressed references |
j9vm_aggressiveOpts | categorical |
| blank | blank, | yes | Enable the use of aggressive performance optimization features, which are expected to become default in upcoming releases |
j9vm_virtualized | categorical |
| blank | blank, | yes | Optimize the VM for virtualized environment, reducing CPU usage when idle |
j9vm_shareclasses | categorical |
| blank | blank, | yes | Enable class sharing |
j9vm_quickstart | categorical |
| blank | blank, | yes | Run JIT with only a subset of optimizations, improving the performance of short-running applications |
j9vm_minimizeUserCpu | categorical |
| blank | blank, | yes | Minimizes user-mode CPU usage in thread synchronization where possible |
j9vm_minNewSpace | 25% of | must not exceed |
j9vm_maxNewSpace | 25% of j9vm_maxHeapSize | must not exceed |
j9vm_minOldSpace | 75% of j9vm_minHeapSize | must not exceed |
j9vm_maxOldSpace | same as j9vm_maxHeapSize | must not exceed |
j9vm_gcthreads | number of CPUs - 1, up to a maximum of 64 | capped to default, no benefit in exceeding that value |
j9vm_compressedReferences | enabled for j9vm_maxHeapSize<= 57 GB |
|
jvm.j9vm_minHeapSize < jvm.j9vm_maxHeapSize |
|
jvm.j9vm_minNewSpace < jvm.j9vm_maxNewSpace && jvm.j9vm_minNewSpace < jvm.j9vm_minHeapSize && jvm.j9vm_maxNewSpace < jvm.j9vm_maxHeapSize |
|
jvm.j9vm_minOldSpace < jvm.j9vm_maxOldSpace && jvm.j9vm_minOldSpace < jvm.j9vm_minHeapSize && jvm.j9vm_maxOldSpace < jvm.j9vm_maxHeapSize |
|
jvm.j9vm_loa_minimum <= jvm.j9vm_loa_initial && jvm.j9vm_loa_initial <= jvm.j9vm_loa_maximum |
|
jvm.j9vm_minFreeHeap + 0.05 < jvm.j9vm_maxFreeHeap |
|
jvm.j9vm_minGcTimeMin < jvm.j9vm_maxGcTime |
|
Java OpenJDK 8 JVM |
Java OpenJDK 11 JVM |
Eclipse OpenJ9 (formerly known as IBM J9) Virtual Machine version 6 |
Eclipse OpenJ9 (formerly known as IBM J9) Virtual Machine version 8 |
Eclipse OpenJ9 (formerly known as IBM J9) version 11 |
This page describes the Optimization Pack for Java OpenJDK 11 JVM.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
The following parameters require their ranges or default values to be updated according to the described rules:
The following tables show a list of constraints that may be required in the definition of the study, depending on the tuned parameters:
This page describes the Optimization Pack for Java OpenJDK 8 JVM.
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
The following parameters require their ranges or default values to be updated according to the described rules:
The following tables show a list of constraints that may be required in the definition of the study, depending on the tuned parameters:
This page describes the Optimization Pack for Eclipse OpenJ9 (formerly known as IBM J9) version 11.
| Name | Unit | Description |
|---|---|---|
The following parameters require their ranges or default values to be updated according to the described rules:
Notice that the value nocompressedreferences for j9vm_compressedReferences can only be specified for JVMs compiled with the proper --with-noncompressedrefs flag. If this is not the case you cannot actively disable compressed references, meaning:
for Xmx <= 57GB is useless to tune this parameter since compressed references are active by default and it is not possible to explicitly disable it
for Xmx > 57GB, since the by default (blank value) compressed references are disabled, Akamas can try to enable it. This requires removing the nocompressedreferences from the domain
The following tables show a list of constraints that may be required in the definition of the study, depending on the tuned parameters:
Notice that
j9vm_newSpaceFixed is mutually exclusive with j9vm_minNewSpace and j9vm_maxNewSpace
j9vm_oldSpaceFixed is mutually exclusive with j9vm_minOldSpace and j9vm_maxOldSpace
the sum of j9vm_minNewSpace and j9vm_minOldSpace must be equal to j9vm_minHeapSize, so it's useless to tune all of them together. Max values seem to be more complex.
The Web Application optimization pack provides a component type apt for monitoring the performances from the end-user perspective of a generic web application, to evaluate the configuration of the technologies in the underlying stack.
The bundled component type provides Akamas with performance metrics representing concepts like throughput, response time, error rate, and user load, split into different levels of detail such as transaction, page, and single request.
| Component Type | Description |
|---|---|
Here’s the command to install the Web Application optimization pack using the Akamas CLI:
The Kubernetes optimization pack allows optimizing containerized applications running on a Kubernetes cluster. Through this optimization pack, Akamas is able to tackle the problem of distributing resources to containerized applications in order to minimize waste and ensure the quality of service.
To achieve these goals the optimization pack provides parameters that focus on the following areas:
Memory allocation
CPU allocation
Number of replicas
Similarly, the bundled metrics provide visibility on the following aspects of tuned applications:
Memory utilization
CPU utilization
The component types provided in this optimization pack allow modeling the entities found in a Kubernetes-based application, optimizing their parameters, and monitoring the key performance metrics.
| Component Type | Description |
|---|
Here’s the command to install the Kubernetes optimization pack optimization-pack using the Akamas CLI:
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Name | Type | Unit | Dafault | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Formula | Notes |
|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Name | Type | Unit | Dafault | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Formula | Notes |
|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Parameter | Default value | Domain |
|---|---|---|
| Formula | Notes |
|---|---|
| Unit | Description |
|---|
mem_used
bytes
The total amount of memory used
requests_throughput
requests/s
The number of requests performed per second
requests_response_time
milliseconds
The average request response time
jvm_heap_size
bytes
The size of the JVM heap memory
jvm_heap_used
bytes
The amount of heap memory used
jvm_heap_util
percent
The utilization % of heap memory
jvm_memory_used
bytes
The total amount of memory used across all the JVM memory pools
jvm_memory_used_details
bytes
The total amount of memory used broken down by pool (e.g., code-cache, compressed-class-space)
jvm_memory_buffer_pool_used
bytes
The total amount bytes used by buffers within the JVM buffer memory pool
cpu_util
percent
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
cpu_used
CPUs
The total amount of CPUs used
jvm_gc_time
percent
The % of wall clock time the JVM spent doing stop the world garbage collection activities
jvm_gc_time_details
percent
The % of wall clock time the JVM spent doing stop the world garbage collection activities broken down by type of garbage collection algorithm (e.g., ParNew)
jvm_gc_count
collections/s
The total number of stop the world JVM garbage collections that have occurred per second
jvm_gc_count_details
collections/s
The total number of stop the world JVM garbage collections that have occurred per second, broken down by type of garbage collection algorithm (e.g., G1, CMS)
jvm_gc_duration
seconds
The average duration of a stop the world JVM garbage collection
jvm_gc_duration_details
seconds
The average duration of a stop the world JVM garbage collection broken down by type of garbage collection algorithm (e.g., G1, CMS)
jvm_threads_current
threads
The total number of active threads within the JVM
jvm_threads_deadlocked
threads
The total number of deadlocked threads within the JVM
jvm_compilation_time
milliseconds
The total time spent by the JVM JIT compiler compiling bytecode
jvm_minHeapSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The inimum heap size.
jvm_maxHeapSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The maximum heap size.
jvm_maxRAM
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The maximum amount of memory used by the JVM.
jvm_initialRAMPercentage
real
percent
1.563
0.1 → 100
yes
The initial percentage of memory used by the JVM.
jvm_maxRAMPercentage
real
percent
25.0
0.1 → 100.0
yes
The percentage of memory used for maximum heap size. Requires Java 10, Java 8 Update 191 or later.
jvm_alwaysPreTouch
categorical
-AlwaysPreTouch
+AlwaysPreTouch, -AlwaysPreTouch
yes
Pretouch pages during initialization.
jvm_metaspaceSize
integer
megabytes
20
You should select your own domain.
yes
The initial size of the allocated class metadata space.
jvm_maxMetaspaceSize
integer
megabytes
20
You should select your own domain.
yes
The maximum size of the allocated class metadata space.
jvm_useTransparentHugePages
categorical
-UseTransparentHugePages
+UseTransparentHugePages, -UseTransparentHugePages
yes
Enables the use of large pages that can dynamically grow or shrink.
jvm_allocatePrefetchInstr
integer
0
0 → 3
yes
Prefetch ahead of the allocation pointer.
jvm_allocatePrefetchDistance
integer
bytes
0
0 → 512
yes
Distance to prefetch ahead of allocation pointer. -1 use system-specific value (automatically determined).
jvm_allocatePrefetchLines
integer
lines
3
1 → 64
yes
The number of lines to prefetch ahead of array allocation pointer.
jvm_allocatePrefetchStyle
integer
1
0 → 3
yes
Selects the prefetch instruction to generate.
jvm_useLargePages
categorical
+UseLargePages
+UseLargePages, -UseLargePages
yes
Enable the use of large page memory.
jvm_aggressiveHeap
categorical
-AggressiveHeap
-AggressiveHeap, +AggressiveHeap
yes
Optimize heap options for long-running memory intensive apps.
jvm_newSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Sets the initial and maximum size of the heap for the young generation (nursery).
jvm_maxNewSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Specifies the upper bound for the young generation size.
jvm_survivorRatio
integer
8
1 → 100
yes
The ratio between the Eden and each Survivor-space within the JVM. For example, a jvm_survivorRatio would mean that the Eden-space is 6 times one Survivor-space.
jvm_useAdaptiveSizePolicy
categorical
+UseAdaptiveSizePolicy
+UseAdaptiveSizePolicy, -UseAdaptiveSizePolicy
yes
Enable adaptive generation sizing. Disable coupled with jvm_targetSurvivorRatio.
jvm_adaptiveSizePolicyWeight
integer
percent
10
1 → 100
yes
The weighting given to the current Garbage Collection time versus previous GC times when checking the timing goal.
jvm_targetSurvivorRatio
integer
50
1 → 100
yes
The desired percentage of Survivor-space used after young garbage collection.
jvm_minHeapFreeRatio
integer
percent
40
1 → 99
yes
The minimum percentage of heap free after garbage collection to avoid shrinking.
jvm_maxHeapFreeRatio
integer
percent
70
1 → 100
yes
The maximum percentage of heap free after garbage collection to avoid shrinking.
jvm_maxTenuringThreshold
integer
15
0 → 15
yes
The maximum value for the tenuring threshold.
jvm_gcType
categorical
Parallel
Serial, Parallel, ConcMarkSweep, G1
yes
Type of the garbage collection algorithm.
jvm_useParallelOldGC
categorical
-UseParallelOldGC
+UseParallelOldGC, -UseParallelOldGC
yes
Enables Parallel Mark and Compact Garbage Collection in Old/Tenured generations.
jvm_concurrentGCThreads
integer
threads
You should select your own default value.
You should select your own domain.
yes
The number of threads concurrent garbage collection will use.
jvm_parallelGCThreads
integer
threads
You should select your own default value.
You should select your own domain.
yes
The number of threads garbage collection will use for parallel phases.
jvm_maxGCPauseMillis
integer
milliseconds
200
1 → 32767
yes
Adaptive size policy maximum GC pause time goal in millisecond.
jvm_resizePLAB
categorical
+ResizePLAB
+ResizePLAB, -ResizePLAB
yes
Enables the dynamic resizing of promotion LABs.
jvm_GCTimeRatio
integer
99
0 → 100
yes
The target fraction of time that can be spent in garbage collection before increasing the heap, computet as 1 / (1 + GCTimeRatio).
jvm_initiatingHeapOccupancyPercent
integer
45
0 → 100
yes
Sets the percentage of the heap occupancy at which to start a concurrent GC cycle.
jvm_youngGenerationSizeIncrement
integer
percent
20
0 → 100
yes
The increment size for Young Generation adaptive resizing.
jvm_tenuredGenerationSizeIncrement
integer
percent
20
0 → 100
yes
The increment size for Old/Tenured Generation adaptive resizing.
jvm_adaptiveSizeDecrementScaleFactor
integer
percent
4
1 → 1024
yes
Specifies the scale factor for goal-driven generation resizing.
jvm_CMSTriggerRatio
integer
80
0 → 100
yes
The percentage of MinHeapFreeRatio allocated before CMS GC starts
jvm_CMSInitiatingOccupancyFraction
integer
-1
-1 → 99
yes
Configure oldgen occupancy fraction threshold for CMS GC. Negative values default to CMSTriggerRatio.
jvm_CMSClassUnloadingEnabled
categorical
+CMSClassUnloadingEnabled
+CMSClassUnloadingEnabled, -CMSClassUnloadingEnabled
yes
Enables class unloading when using CMS.
jvm_useCMSInitiatingOccupancyOnly
categorical
-UseCMSInitiatingOccupancyOnly
+UseCMSInitiatingOccupancyOnly, -UseCMSInitiatingOccupancyOnly
yes
Use of the occupancy value as the only criterion for initiating the CMS collector.
jvm_G1HeapRegionSize
integer
megabytes
8
1→32
yes
Sets the size of the regions for G1.
jvm_G1ReservePercent
integer
10
0 → 50
yes
Sets the percentage of the heap that is reserved as a false ceiling to reduce the possibility of promotion failure for the G1 collector.
jvm_G1NewSizePercent
integer
5
0 → 100
yes
Sets the percentage of the heap to use as the minimum for the young generation size.
jvm_G1MaxNewSizePercent
integer
60
0 → 100
yes
Sets the percentage of the heap size to use as the maximum for young generation size.
jvm_G1MixedGCLiveThresholdPercent
integer
85
0 → 100
yes
Sets the occupancy threshold for an old region to be included in a mixed garbage collection cycle.
jvm_G1HeapWastePercent
integer
5
0 → 100
yes
The maximum percentage of the reclaimable heap before starting mixed GC.
jvm_G1MixedGCCountTarget
integer
collections
8
0 → 100
yes
Sets the target number of mixed garbage collections after a marking cycle to collect old regions with at most G1MixedGCLIveThresholdPercent live data. The default is 8 mixed garbage collections.
jvm_G1OldCSetRegionThresholdPercent
integer
10
0 → 100
yes
The upper limit on the number of old regions to be collected during mixed GC.
jvm_G1AdaptiveIHOPNumInitialSamples
integer
3
1→2097152
yes
The number of completed time periods from initial mark to first mixed GC required to use the input values for prediction of the optimal occupancy to start marking.
jvm_G1UseAdaptiveIHOP
categorical
+G1UseAdaptiveIHOP
+G1UseAdaptiveIHOP, -G1UseAdaptiveIHOP
yes
Adaptively adjust the initiating heap occupancy from the initial value of InitiatingHeapOccupancyPercent.
jvm_reservedCodeCacheSize
integer
megabytes
240
3 → 2048
yes
The maximum size of the compiled code cache pool.
jvm_tieredCompilation
categorical
+TieredCompilation
+TieredCompilation, -TieredCompilation
yes
The type of the garbage collection algorithm.
jvm_tieredCompilationStopAtLevel
integer
4
0 → 4
yes
Overrides the number of detected CPUs that the VM will use to calculate the size of thread pools.
jvm_compilationThreads
integer
threads
You should select your own default value.
You should select your own domain.
yes
The number of compilation threads.
jvm_backgroundCompilation
categorical
+BackgroundCompilation
+BackgroundCompilation, -BackgroundCompilation
yes
Allow async interpreted execution of a method while it is being compiled.
jvm_inline
categorical
+Inline
+Inline, -Inline
yes
Enable inlining.
jvm_maxInlineSize
integer
bytes
35
1 → 2097152
yes
The bytecode size limit (in bytes) of the inlined methods.
jvm_inlineSmallCode
integer
bytes
2000
1 → 16384
yes
The maximum compiled code size limit (in bytes) of the inlined methods.
jvm_aggressiveOpts
categorical
-AggressiveOpts
+AggressiveOpts, -AggressiveOpts
yes
Turn on point performance compiler optimizations.
jvm_usePerfData
categorical
+UsePerfData
+UsePerfData, -UsePerfData
yes
Enable monitoring of performance data.
jvm_useNUMA
categorical
-UseNUMA
+UseNUMA, -UseNUMA
yes
Enable NUMA.
jvm_useBiasedLocking
categorical
+UseBiasedLocking
+UseBiasedLocking, -UseBiasedLocking
yes
Manage the use of biased locking.
jvm_activeProcessorCount
integer
CPUs
1
1 → 512
yes
Overrides the number of detected CPUs that the VM will use to calculate the size of thread pools.
Parameter
Default value
Domain
jvm_minHeapSize
Depends on the instance available memory
jvm_maxHeapSize
Depends on the instance available memory
jvm_newSize
Depends on the configured heap
jvm_maxNewSize
Depends on the configured heap
jvm_concurrentGCThreads
Depends on the available CPU cores
Depends on the available CPU cores
jvm_parallelGCThreads
Depends on the available CPU cores
Depends on the available CPU cores
jvm_compilation_threads
Depends on the available CPU cores
Depends on the available CPU cores
jvm.jvm_minHeapSize <= jvm.jvm_maxHeapSize
jvm.jvm_minHeapFreeRatio <= jvm.jvm_maxHeapFreeRatio
jvm.jvm_maxNewSize < jvm.jvm_maxHeapSize * 0.8
jvm.jvm_concurrentGCThreads <= jvm.jvm_parallelGCThreads
jvm_activeProcessorCount < container.cpu_limits + 1
mem_used
bytes
The total amount of memory used
requests_throughput
requests/s
The number of requests performed per second
requests_response_time
milliseconds
The average request response time
jvm_heap_size
bytes
The size of the JVM heap memory
jvm_heap_used
bytes
The amount of heap memory used
jvm_heap_util
percent
The utilization % of heap memory
jvm_memory_used
bytes
The total amount of memory used across all the JVM memory pools
jvm_memory_used_details
bytes
The total amount of memory used broken down by pool (e.g., code-cache, compressed-class-space)
jvm_memory_buffer_pool_used
bytes
The total amount bytes used by buffers within the JVM buffer memory pool
cpu_util
percent
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
cpu_used
CPUs
The total amount of CPUs used
jvm_gc_time
percent
The % of wall clock time the JVM spent doing stop the world garbage collection activities
jvm_gc_time_details
percent
The % of wall clock time the JVM spent doing stop the world garbage collection activities broken down by type of garbage collection algorithm (e.g., ParNew)
jvm_gc_count
collections/s
The total number of stop the world JVM garbage collections that have occurred per second
jvm_gc_count_details
collections/s
The total number of stop the world JVM garbage collections that have occurred per second, broken down by type of garbage collection algorithm (e.g., G1, CMS)
jvm_gc_duration
seconds
The average duration of a stop the world JVM garbage collection
jvm_gc_duration_details
seconds
The average duration of a stop the world JVM garbage collection broken down by type of garbage collection algorithm (e.g., G1, CMS)
jvm_threads_current
threads
The total number of active threads within the JVM
jvm_threads_deadlocked
threads
The total number of deadlocked threads within the JVM
jvm_compilation_time
milliseconds
The total time spent by the JVM JIT compiler compiling bytecode
jvm_minHeapSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The inimum heap size.
jvm_maxHeapSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The maximum heap size.
jvm_maxRAM
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The maximum amount of memory used by the JVM.
jvm_initialRAMPercentage
real
percent
1.563
0.1 → 100
yes
The initial percentage of memory used by the JVM.
jvm_maxRAMPercentage
real
percent
25.0
0.1 → 100.0
yes
The percentage of memory used for maximum heap size. Requires Java 10, Java 8 Update 191 or later.
jvm_alwaysPreTouch
categorical
-AlwaysPreTouch
+AlwaysPreTouch, -AlwaysPreTouch
yes
Pretouch pages during initialization.
jvm_metaspaceSize
integer
megabytes
20
You should select your own domain.
yes
The initial size of the allocated class metadata space.
jvm_maxMetaspaceSize
integer
megabytes
20
You should select your own domain.
yes
The maximum size of the allocated class metadata space.
jvm_useTransparentHugePages
categorical
-UseTransparentHugePages
+UseTransparentHugePages, -UseTransparentHugePages
yes
Enables the use of large pages that can dynamically grow or shrink.
jvm_allocatePrefetchInstr
integer
0
0 → 3
yes
Prefetch ahead of the allocation pointer.
jvm_allocatePrefetchDistance
integer
bytes
0
0 → 512
yes
Distance to prefetch ahead of allocation pointer. -1 use system-specific value (automatically determined).
jvm_allocatePrefetchLines
integer
lines
3
1 → 64
yes
The number of lines to prefetch ahead of array allocation pointer.
jvm_allocatePrefetchStyle
integer
1
0 → 3
yes
Selects the prefetch instruction to generate.
jvm_useLargePages
categorical
+UseLargePages
+UseLargePages, -UseLargePages
yes
Enable the use of large page memory.
jvm_newSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Sets the initial and maximum size of the heap for the young generation (nursery).
jvm_maxNewSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Specifies the upper bound for the young generation size.
jvm_survivorRatio
integer
8
1 → 100
yes
The ratio between the Eden and each Survivor-space within the JVM. For example, a jvm_survivorRatio would mean that the Eden-space is 6 times one Survivor-space.
jvm_useAdaptiveSizePolicy
categorical
+UseAdaptiveSizePolicy
+UseAdaptiveSizePolicy, -UseAdaptiveSizePolicy
yes
Enable adaptive generation sizing. Disable coupled with jvm_targetSurvivorRatio.
jvm_adaptiveSizePolicyWeight
integer
percent
10
1 → 100
yes
The weighting given to the current Garbage Collection time versus previous GC times when checking the timing goal.
jvm_targetSurvivorRatio
integer
50
1 → 100
yes
The desired percentage of Survivor-space used after young garbage collection.
jvm_minHeapFreeRatio
integer
percent
40
1 → 99
yes
The minimum percentage of heap free after garbage collection to avoid shrinking.
jvm_maxHeapFreeRatio
integer
percent
70
1 → 100
yes
The maximum percentage of heap free after garbage collection to avoid shrinking.
jvm_maxTenuringThreshold
integer
15
0 → 15
yes
The maximum value for the tenuring threshold.
jvm_gcType
categorical
Parallel
Serial, Parallel, ConcMarkSweep, G1
yes
Type of the garbage collection algorithm.
jvm_useParallelOldGC
categorical
-UseParallelOldGC
+UseParallelOldGC, -UseParallelOldGC
yes
Enables Parallel Mark and Compact Garbage Collection in Old/Tenured generations.
jvm_concurrentGCThreads
integer
threads
You should select your own default value.
You should select your own domain.
yes
The number of threads concurrent garbage collection will use.
jvm_parallelGCThreads
integer
threads
You should select your own default value.
You should select your own domain.
yes
The number of threads garbage collection will use for parallel phases.
jvm_maxGCPauseMillis
integer
milliseconds
200
1 → 32767
yes
Adaptive size policy maximum GC pause time goal in millisecond.
jvm_resizePLAB
categorical
+ResizePLAB
+ResizePLAB, -ResizePLAB
yes
Enables the dynamic resizing of promotion LABs.
jvm_GCTimeRatio
integer
99
0 → 100
yes
The target fraction of time that can be spent in garbage collection before increasing the heap, computet as 1 / (1 + GCTimeRatio).
jvm_initiatingHeapOccupancyPercent
integer
45
0 → 100
yes
Sets the percentage of the heap occupancy at which to start a concurrent GC cycle.
jvm_youngGenerationSizeIncrement
integer
percent
20
0 → 100
yes
The increment size for Young Generation adaptive resizing.
jvm_tenuredGenerationSizeIncrement
integer
percent
20
0 → 100
yes
The increment size for Old/Tenured Generation adaptive resizing.
jvm_adaptiveSizeDecrementScaleFactor
integer
percent
4
1 → 1024
yes
Specifies the scale factor for goal-driven generation resizing.
jvm_CMSTriggerRatio
integer
80
0 → 100
yes
The percentage of MinHeapFreeRatio allocated before CMS GC starts
jvm_CMSInitiatingOccupancyFraction
integer
-1
-1 → 99
yes
Configure oldgen occupancy fraction threshold for CMS GC. Negative values default to CMSTriggerRatio.
jvm_CMSClassUnloadingEnabled
categorical
+CMSClassUnloadingEnabled
+CMSClassUnloadingEnabled, -CMSClassUnloadingEnabled
yes
Enables class unloading when using CMS.
jvm_useCMSInitiatingOccupancyOnly
categorical
-UseCMSInitiatingOccupancyOnly
+UseCMSInitiatingOccupancyOnly, -UseCMSInitiatingOccupancyOnly
yes
Use of the occupancy value as the only criterion for initiating the CMS collector.
jvm_G1HeapRegionSize
integer
megabytes
8
1→32
yes
Sets the size of the regions for G1.
jvm_G1ReservePercent
integer
10
0 → 50
yes
Sets the percentage of the heap that is reserved as a false ceiling to reduce the possibility of promotion failure for the G1 collector.
jvm_G1NewSizePercent
integer
5
0 → 100
yes
Sets the percentage of the heap to use as the minimum for the young generation size.
jvm_G1MaxNewSizePercent
integer
60
0 → 100
yes
Sets the percentage of the heap size to use as the maximum for young generation size.
jvm_G1MixedGCLiveThresholdPercent
integer
85
0 → 100
yes
Sets the occupancy threshold for an old region to be included in a mixed garbage collection cycle.
jvm_G1HeapWastePercent
integer
5
0 → 100
yes
The maximum percentage of the reclaimable heap before starting mixed GC.
jvm_G1MixedGCCountTarget
integer
collections
8
0 → 100
yes
Sets the target number of mixed garbage collections after a marking cycle to collect old regions with at most G1MixedGCLIveThresholdPercent live data. The default is 8 mixed garbage collections.
jvm_G1OldCSetRegionThresholdPercent
integer
10
0 → 100
yes
The upper limit on the number of old regions to be collected during mixed GC.
jvm_reservedCodeCacheSize
integer
megabytes
240
3 → 2048
yes
The maximum size of the compiled code cache pool.
jvm_tieredCompilation
categorical
+TieredCompilation
+TieredCompilation, -TieredCompilation
yes
The type of the garbage collection algorithm.
jvm_tieredCompilationStopAtLevel
integer
4
0 → 4
yes
Overrides the number of detected CPUs that the VM will use to calculate the size of thread pools.
jvm_compilationThreads
integer
threads
You should select your own default value.
You should select your own domain.
yes
The number of compilation threads.
jvm_backgroundCompilation
categorical
+BackgroundCompilation
+BackgroundCompilation, -BackgroundCompilation
yes
Allow async interpreted execution of a method while it is being compiled.
jvm_inline
categorical
+Inline
+Inline, -Inline
yes
Enable inlining.
jvm_maxInlineSize
integer
bytes
35
1 → 2097152
yes
The bytecode size limit (in bytes) of the inlined methods.
jvm_inlineSmallCode
integer
bytes
2000
1 → 16384
yes
The maximum compiled code size limit (in bytes) of the inlined methods.
jvm_aggressiveOpts
categorical
-AggressiveOpts
+AggressiveOpts, -AggressiveOpts
yes
Turn on point performance compiler optimizations.
jvm_usePerfData
categorical
+UsePerfData
+UsePerfData, -UsePerfData
yes
Enable monitoring of performance data.
jvm_useNUMA
categorical
-UseNUMA
+UseNUMA, -UseNUMA
yes
Enable NUMA.
jvm_useBiasedLocking
categorical
+UseBiasedLocking
+UseBiasedLocking, -UseBiasedLocking
yes
Manage the use of biased locking.
jvm_activeProcessorCount
integer
CPUs
1
1 → 512
yes
Overrides the number of detected CPUs that the VM will use to calculate the size of thread pools.
Parameter
Default value
Domain
jvm_minHeapSize
Depends on the instance available memory
jvm_maxHeapSize
Depends on the instance available memory
jvm_newSize
Depends on the configured heap
jvm_maxNewSize
Depends on the configured heap
jvm_concurrentGCThreads
Depends on the available CPU cores
Depends on the available CPU cores
jvm_parallelGCThreads
Depends on the available CPU cores
Depends on the available CPU cores
jvm_compilation_threads
Depends on the available CPU cores
Depends on the available CPU cores
jvm.jvm_minHeapSize <= jvm.jvm_maxHeapSize
jvm.jvm_minHeapFreeRatio <= jvm.jvm_maxHeapFreeRatio
jvm.jvm_maxNewSize < jvm.jvm_maxHeapSize
jvm.jvm_concurrentGCThreads <= jvm.jvm_parallelGCThreads
jvm_heap_size
bytes
The size of the JVM heap memory
jvm_heap_used
bytes
The amount of heap memory used
jvm_heap_util
percent
The utilization % of heap memory
jvm_memory_used
bytes
The total amount of memory used across all the JVM memory pools
jvm_memory_used_details
bytes
The total amount of memory used broken down by pool (e.g., code-cache, compressed-class-space)
jvm_memory_buffer_pool_used
bytes
The total amount of bytes used by buffers within the JVM buffer memory pool
jvm_gc_time
percent
The % of wall clock time the JVM spent doing stop the world garbage collection activities
jvm_gc_time_details
percent
The % of wall clock time the JVM spent doing stop the world garbage collection activities broken down by type of garbage collection algorithm (e.g., ParNew)
jvm_gc_count
collections/s
The total number of stop the world JVM garbage collections that have occurred per second
jvm_gc_count_details
collections/s
The total number of stop the world JVM garbage collections that have occurred per second, broken down by type of garbage collection algorithm (e.g., G1, CMS)
jvm_gc_duration
seconds
The average duration of a stop the world JVM garbage collection
jvm_gc_duration_details
seconds
The average duration of a stop the world JVM garbage collection broken down by type of garbage collection algorithm (e.g., G1, CMS)
jvm_threads_current
threads
The total number of active threads within the JVM
jvm_threads_deadlocked
threads
The total number of deadlocked threads within the JVM
jvm_compilation_time
milliseconds
The total time spent by the JVM JIT compiler compiling bytecode
j9vm_minHeapSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Minimum heap size (in megabytes)
j9vm_maxHeapSize
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Maximum heap size (in megabytes)
j9vm_minFreeHeap
real
percent
0.3
0.1 → 0.5
yes
Specify the minimum % free heap required after global GC
j9vm_maxFreeHeap
real
percent
0.6
0.4 → 0.9
yes
Specify the maximum % free heap required after global GC
j9vm_gcPolicy
categorical
gencon
gencon, subpool, optavgpause, optthruput, nogc
yes
GC policy to use
j9vm_gcThreads
integer
threads
You should select your own default value.
1 → 64
yes
Number of threads the garbage collector uses for parallel operations
j9vm_scvTenureAge
integer
10
1 → 14
yes
Set the initial tenuring threshold for generational concurrent GC policy
j9vm_scvAdaptiveTenureAge
categorical
blank
blank, -Xgc:scvNoAdaptiveTenure
yes
Enable the adaptive tenure age for generational concurrent GC policy
j9vm_newSpaceFixed
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The fixed size of the new area when using the gencon GC policy. Must not be set alongside min or max
j9vm_minNewSpace
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The initial size of the new area when using the gencon GC policy
j9vm_maxNewSpace
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The maximum size of the new area when using the gencon GC policy
j9vm_oldSpaceFixed
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The fixed size of the old area when using the gencon GC policy. Must not be set alongside min or max
j9vm_minOldSpace
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The initial size of the old area when using the gencon GC policy
j9vm_maxOldSpace
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
The maximum size of the old area when using the gencon GC policy
j9vm_concurrentScavenge
categorical
concurrentScavenge
concurrentScavenge, noConcurrentScavenge
yes
Support pause-less garbage collection mode with gencon
j9vm_gcPartialCompact
categorical
nopartialcompactgc
nopartialcompactgc, partialcompactgc
yes
Enable partial compaction
j9vm_concurrentMeter
categorical
soa
soa, loa, dynamic
yes
Determine which area is monitored by the concurrent mark
j9vm_concurrentBackground
integer
0
0 → 128
yes
The number of background threads assisting the mutator threads in concurrent mark
j9vm_concurrentSlack
integer
megabytes
0
You should select your own domain.
yes
The target size of free heap space for concurrent collectors
j9vm_concurrentLevel
integer
percent
8
0 → 100
yes
The ratio between the amount of heap allocated and the amount of heap marked
j9vm_gcCompact
categorical
blank
blank, -Xcompactgc, -Xnocompactgc
yes
Enables full compaction on all garbage collections (system and global)
j9vm_minGcTime
real
percent
0.05
0.0 → 1.0
yes
The minimum percentage of time to be spent in garbage collection, triggering the resize of the heap to meet the specified values
j9vm_maxGcTime
real
percent
0.13
0.0 → 1.0
yes
The maximum percentage of time to be spent in garbage collection, triggering the resize of the heap to meet the specified values
j9vm_loa
categorical
loa
loa, noloa
yes
Enable the allocation of the large area object during garbage collection
j9vm_loa_initial
real
0.05
0.0 → 0.95
yes
The initial portion of the tenure area allocated to the large area object
j9vm_loa_minimum
real
0.01
0.0 → 0.95
yes
The minimum portion of the tenure area allocated to the large area object
j9vm_loa_maximum
real
0.5
0.0 → 0.95
yes
The maximum portion of the tenure area allocated to the large area object
j9vm_jitOptlevel
ordinal
noOpt
noOpt, cold, warm, hot, veryHot, scorching
yes
Force the JIT compiler to compile all methods at a specific optimization level
j9vm_compilationThreads
integer
threads
You should select your own default value.
1 → 7
yes
Number of JIT threads
j9vm_codeCacheTotal
integer
megabytes
You should select your own default value.
You should select your own domain.
yes
Maximum size limit in MB for the JIT code cache
j9vm_jit_count
integer
10000
0 → 1000000
yes
The number of times a method is called before it is compiled
j9vm_lockReservation
categorical
blank
blank, -XlockReservation
no
Enables an optimization that presumes a monitor is owned by the thread that last acquired it
j9vm_compressedReferences
categorical
blank
blank, -Xcompressedrefs, -Xnocompressedrefs
yes
Enable/disable the use of compressed references
j9vm_aggressiveOpts
categorical
blank
blank, -Xaggressive
yes
Enable the use of aggressive performance optimization features, which are expected to become default in upcoming releases
j9vm_virtualized
categorical
blank
blank, -Xtune:virtualized
yes
Optimize the VM for virtualized environment, reducing CPU usage when idle
j9vm_shareclasses
categorical
blank
blank, -Xshareclasses
yes
Enable class sharing
j9vm_quickstart
categorical
blank
blank, -Xquickstart
yes
Run JIT with only a subset of optimizations, improving the performance of short-running applications
j9vm_minimizeUserCpu
categorical
blank
blank, -Xthr:minimizeUserCPU
yes
Minimizes user-mode CPU usage in thread synchronization where possible
j9vm_minNewSpace
25% of j9vm_minHeapSize
must not exceed j9vm_minHeapSize
j9vm_maxNewSpace
25% of j9vm_maxHeapSize
must not exceed j9vm_maxHeapSize
j9vm_minOldSpace
75% of j9vm_minHeapSize
must not exceed j9vm_minHeapSize
j9vm_maxOldSpace
same as j9vm_maxHeapSize
must not exceed j9vm_maxHeapSize
j9vm_gcthreads
number of CPUs - 1, up to a maximum of 64
capped to default, no benefit in exceeding that value
j9vm_compressedReferences
enabled for j9vm_maxHeapSize<= 57 GB
jvm.j9vm_minHeapSize < jvm.j9vm_maxHeapSize
jvm.j9vm_minNewSpace < jvm.j9vm_maxNewSpace && jvm.j9vm_minNewSpace < jvm.j9vm_minHeapSize && jvm.j9vm_maxNewSpace < jvm.j9vm_maxHeapSize
jvm.j9vm_minOldSpace < jvm.j9vm_maxOldSpace && jvm.j9vm_minOldSpace < jvm.j9vm_minHeapSize && jvm.j9vm_maxOldSpace < jvm.j9vm_maxHeapSize
jvm.j9vm_loa_minimum <= jvm.j9vm_loa_initial && jvm.j9vm_loa_initial <= jvm.j9vm_loa_maximum
jvm.j9vm_minFreeHeap + 0.05 < jvm.j9vm_maxFreeHeap
jvm.j9vm_minGcTimeMin < jvm.j9vm_maxGcTime
The Golang runtime 1
cpu_used
CPUs
The total amount of CPUs used
cpu_util
percents
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
memory_used
bytes
The total amount of memory used
memory_util
percent
The average memory utilization %
nodejs_gc_heap_used
bytes
GC heap used
nodejs_rss
bytes
Process Resident Set Size (RSS)
nodejs_v8_heap_total
bytes
V8 heap total
nodejs_v8_heap_used
bytes
V8 heap used
nodejs_number_active_threads
threads
Number of active threads
v8_allocation_size_pretenuring
categorical
true
true, false
yes
Pretenure with allocation sites
v8_min_semi_space_size
integer
megabytes
0
0 → 1048576
yes
Min size of a semi-space, the new space consists of two semi-spaces
v8_min_semi_space_size
integer
megabytes
0
0 → 1048576
yes
Max size of a semi-space, the new space consists of two semi-spaces
v8_semi_space_grouth_factor
integer
2
0 → 100
yes
Factor by which to grow the new space
v8_max_old_space_size
integer
megabytes
0
0 → 1048576
yes
Max size of the old space
v8_max_heap_size
integer
megabytes
0
0 → 1048576
yes
Max size of the heap both max_semi_space_size and max_old_space_size take precedence. All three flags cannot be specified at the same time.
v8_initial_heap_size
integer
megabytes
0
0 → 1048576
yes
Initial size of the heap
v8_initial_old_space_size
integer
megabytes
0
0 → 1048576
yes
Initial old space size
v8_parallel_scavenge
categorical
true
true, false
yes
Parallel scavenge
v8_scavenge_task_trigger
integer
80
1 → 100
yes
Scavenge task trigger in percent of the current heap limit
v8_scavenge_separate_stack_scanning
categorical
false
true, false
yes
Use a separate phase for stack scanning in scavenge
v8_concurrent_marking
categorical
true
true, false
yes
Use concurrent marking
v8_parallel_marking
categorical
true
true, false
yes
Use parallel marking in atomic pause
v8_concurrent_sweeping
categorical
true
true, false
yes
Use concurrent sweeping
v8_heap_growing_percent
integer
0
0 → 99
yes
Specifies heap growing factor as (1 + heap_growing_percent/100)
v8_os_page_size
integer
kylobytes
0
0 → 1048576
yes
Override OS page size
v8_stack_size
integer
kylobytes
984
16 → 1048576
yes
Default size of stack region v8 is allowed to use
v8_single_threaded
categorical
false
true, false
yes
Disable the use of background tasks
v8_single_threaded_gc
categorical
false
true, false
yes
Disable the use of background gc tasks
The Node JS runtime
Web Application
cpu_used
CPUs
The total amount of CPUs used
cpu_util
percents
The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work)
go_heap_size
bytes
The largest size reached by the Go heap memory
go_heap_used
bytes
The amount of heap memory used
go_heap_util
bytes
The amount of heap memory used
go_memory_used
bytes
The total amount of memory used by Go
go_gc_time
percent
The % of wall clock time the Go spent doing stop the world garbage collection activities
go_gc_duration
seconds
The average duration of a stop the world Go garbage collection
go_gc_count
collections/s
The total number of stop the world Go garbage collections that have occurred per second
go_threads_current
threads
The total number of active Go threads
go_goroutines_current
goroutines
The total number of active Goroutines
go_gcTargetPercentage
integer
100
0 → 25000
yes
Sets the GOGC variable which controls the aggressiveness of the garbage collector
go_maxProcs
integer
8
0 → 100
yes
Limits the number of operating system threads that can execute user-level code simultaneously
transactions_throughput | transactions/s | The number of transactions executed per second |
transactions_response_time | milliseconds | The average transaction response time |
transactions_response_time_max | milliseconds | The maximum recorded transaction response time |
transactions_response_time_min | milliseconds | The minimum recorded transaction response time |
pages_throughput | pages/s | The number of pages requested per second |
pages_response_time | milliseconds | The average page response time |
pages_response_time_max | milliseconds | The maximum recorded page response time |
pages_response_time_min | milliseconds | The minimum recorded page response time |
requests_throughput | requests/s | The number of requests performed per second |
requests_response_time | milliseconds | The average request response time |
requests_response_time_max | milliseconds | The maximum recorded request response time |
requests_response_time_min | milliseconds | The minimum recorded request response time |
transactions_error_rate | percent | The percentage of transactions flagged as error |
transactions_error_throughput | transactions/s | The number of transactions flagged as error per second |
pages_error_rate | percent | The percentage of pages flagged as error |
pages_error_throughput | pages/s | The number of pages flagged as error per second |
requests_error_rate | percent | The requests of requests flagged as error |
requests_error_throughput | requests/s | The number of requests flagged as error per second |
users | users | The number of users performing requests on the web |
k8s_workload_desired_pods | pods | Number of desired pods per workload |
k8s_workload_pods | pods | Pods per workload and phase |
k8s_workload_running_pods | pods | The number of running pods per workload |
k8s_workload_cpu_used | millicores | The total amount of CPUs used by the entire workload |
k8s_workload_memory_used | bytes | The total amount of memory used by the entire workload |
k8s_workload_replicas | integer | pods |
|
| yes | Number of desired pods in the deployment |
k8s_pod_cpu_used | millicores | The CPUs used by the pod |
k8s_pod_cpu_throttle_time | percent | The percentage of time the CPU has been throttled |
k8s_pod_cpu_request | millicores | The CPUs requested for the pod |
k8s_pod_cpu_limit | millicores | The CPUs allowed for the pod |
k8s_pod_cpu_util | percent | Percentage of CPUs used with respect to the limit |
k8s_pod_memory_util | percent | The percentage of memory used with respect to the limit. Memory used includes all types of memory, including file system cache |
k8s_pod_memory_util_nocache | percent | The percentage of working set memory used with respect to the limit |
k8s_pod_memory_used | bytes | The total amount of memory used by the pod. Memory used includes all types of memory, including file system cache |
k8s_pod_memory_request | bytes | The memory requested for the pod |
k8s_pod_memory_limit | bytes | The memory limit for the pod |
k8s_pod_memory_working_set | bytes | Current working set in bytes |
k8s_pod_memory_limit_hits | hits/s | The number of times per second the used memory hit the limit |
k8s_pod_container_restarts | events | The number of pod restarts for a container (Labels: container) |
k8s_pod_desired_containers | containers | The number of desired c |
container_cpu_util | CPUs | The number of CPUs (or fraction of CPUs) allowed for a container |
container_cpu_used | percents | CPUs used by the container per second |
container_cpu_throttle_time | CPUs | CPUs used by the container per second |
container_cpu_limit | percent | The number of CPUs (or fraction of CPUs) allowed for a container |
container_mem_util_nocache | percent | Percentage of memory used with respect to the limit. Memory used includes all types of memory, including file system cache |
container_mem_util | percent | Percentage of working set memory used with respect to the limit |
container_mem_used | bytes | The total amount of memory used by the container. Memory used includes all types of memory, including file system cache |
container_mem_limit | bytes | Memory limit for the container |
container_mem_working_set | threads | Current working set in bytes |
container_mem_limit_hits | hits/s | Number of times memory usage hits memory limit per second |
limits_cpu | integer | CPUs | 0.7 |
| Limits on the amount of CPU resources usage in CPU units |
requests_cpu | integer | megabytes | 0.7 |
| Limits on the amount of memory resources usage |
limits_memory | integer | CPUs | 128 |
| Amount of CPU resources requests in CPU units |
requests_memory | integer | megabytes | 128 |
| Amount of memory resources requests |
Kubernetes Container |
Kubernetes Pod |
Kubernetes Workload |
Kubernetes Namespace |
Kubernetes Cluster |
Docker container |
The PostgreSQL optimization pack allows you to explore and tune the configuration space of PostgreSQL parameters. In this way, an Akamas study can ramp up the transaction number or minimize its resource consumption according to your typical workload, cutting costs. The main tuning areas covered by the parameters provided in this optimization pack are:
Background writer management
VACUUM management
Deadlock and concurrency management
Write-ahead management
The optimization pack includes metrics to monitor:
Query executions
Concurrency and locks
Buffers and disk I/O
These component types model different PostgreSQL releases. They provided a subset of the parameters available for the best optimization results.
| Component Type | Description |
|---|
Here’s the command to install the PostgreSQL optimization pack using the Akamas CLI:
This page describes the Optimization Pack for AWS EC2.
| Name | Unit | Description |
|---|
| Name | Unit | Description |
|---|
| Name | Unit | Description |
|---|
Notice: for the following parameters to take effect, the instance needs to be stopped and changes need to be applied before restarting the instance.
The following table shows a sample of constraints that are required in the definition of the study, depending on the tuned parameters.
Notice that AWS does not support all combinations of instance types and sizes, so it is better to specify them beforehand in your constraints to avoid unnecessary experiment failures.
Instance size is an ordinal parameter, this means you constraint it by using a 0-based index, as in this example:
| Parameter | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Parameter | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
| Name | Unit | Description |
|---|
| Name | Unit | Description |
|---|
| Name | Unit | Type | Default Value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Type | Unit | Default value | Restart | Description |
|---|
k8s_cluster_cpu
millicores
The CPUs in the cluster
k8s_cluster_cpu_available
millicores
The CPUs available for additional pods in the cluster
k8s_cluster_cpu_util
percent
The percentage of used CPUs in the cluster
k8s_cluster_cpu_request
millicores
The total CPUs requested in the cluster
k8s_cluster_memory
bytes
The overall memory in the cluster
k8s_cluster_memory_available
bytes
The amount of memory available for additional pods in the cluster
k8s_cluster_memory_util
percent
The percentage of used memory in the cluster
k8s_cluster_memory_request
bytes
The total memory requested in the cluster
k8s_cluster_nodes
nodes
The number of nodes in the cluster
IBM WebSphere Application Server 8.5
IBM WebSphere Liberty ND
k8s_namespace_cpu_limit
millicores
The CPU limit for the namespace
k8s_namespace_cpu_request
millicores
The CPUs requested for the namespace
k8s_namespace_memory_limit
bytes
The memory limit for the namespace
k8s_namespace_memory_request
bytes
Memory requested for the namespace
k8s_namespace_running_pods
pdds
The number of running pods in the namespace
Amazon Web Services Elastic Compute Cloud
Amazon Web Services Lambda
was_tcp_maxppenconnections_tcp2
integer
connections
20000
1 → 128000
yes
Maximum number of connections that are available for a server to use (TCP_2)
was_tcp_listenBacklog_tcp2
integer
connections
511
1 → 1024
yes
Maximum number of outstanding connection requests that the operating system can buffer while it waits for the application server to accept the connections (TCP_2)
was_tcp_maxppenconnections_tcp4
integer
connections
20000
1 → 128000
yes
Maximum number of connections that are available for a server to use (TCP_4)
was_tcp_listenBacklog_tcp4
integer
connections
511
1 → 1024
yes
Maximum number of outstanding connection requests that the operating system can buffer while it waits for the application server to accept the connections (TCP_4)
was_http_maximumPersistentRequests_http2
integer
requests
10000
1 → 20000
yes
Maximum number of persistent requests that are allowed on a single HTTP connection (HTTP_2)
was_http_maximumPersistentRequests_http4
integer
requests
10000
1 → 20000
yes
Maximum number of persistent requests that are allowed on a single HTTP connection (HTTP_4)
was_threadpools_minimumSize_webcontainer
integer
threads
50
1 → 100
yes
Minimum number of threads to allow in the pool (Web Container)
was_threadpools_maximumsize_webcontainer
integer
threads
50
1 → 500
yes
Maximum number of threads to maintain in the thread pool (Web Container)
was_threadpools_minimumSize_default
integer
threads
20
1 → 100
yes
Maximum number of threads to maintain in the thread pool (Web Container)
was_threadpools_maximumsize_default
integer
threads
20
1 → 500
yes
Maximum number of threads to maintain in the default thread pool (default)
was_threadpools_minimumSize_threadpoolmanager_orb
integer
threads
10
1 → 100
yes
Minimum number of threads to allow in the pool (ThreadPoolManager ORB)
was_threadpools_maximumsize_threadpoolmanager_orb
integer
threads
50
1 → 500
yes
Maximum number of threads to maintain in the thread pool (ThreadPoolManager ORB)
was_threadpools_minimumSize_objectrequestbroker_orb
integer
threads
10
1 → 100
yes
Minimum number of threads to allow in the pool (ObjectRequestBroker ORB)
was_threadpools_maximumsize_objectrequestbroker_orb
integer
threads
50
1 → 500
yes
Maximum number of threads to maintain in the thread pool (ObjectRequestBroker ORB)
was_threadpools_minimumSize_custom_TCPChannel_DCS
integer
20
1 → 100
yes
Minimum number of threads to allow in the pool (TCPChannel.DCS)
was_threadpools_maximumsize_custom_TCPChannel_DCS
integer
threads
100
1 → 500
yes
Maximum number of threads to maintain in the thread pool (TCPChannel.DCS)
was_auth_cacheTimeout
integer
milliseconds
600
0 → 7200
yes
The time period at which the authenticated credential in the cache expires
was_webserverplugin_serverIOtimeout
integer
milliseconds
900
-1 → 1800
yes
How long should the plug-in wait for a response from the application
was_Server_provisionComponents
categorical
false
true, false
yes
Select this property if you want the server components started as they are needed by an application that is running on this server
was_ObjectRequestBroker_noLocalCopies
categorical
false
true, false
yes
Specifies how the ORB passes parameters. If enabled, the ORB passes parameters by reference instead of by value, to avoid making an object copy. If disabled, a copy of the parameter passes rather than the parameter object itself.
was_PMIService_statisticSet
categorical
basic
true, false
yes
When PMI service is enabled, the monitoring of individual components can be enabled or disabled dynamically. PMI provides four predefined statistic sets that can be used to enable a set of statistics
aws_lambda_duration | seconds | The duration of an AWS Lambda function execution |
aws_lambda_memory_size | megabytes | The memory size allocated for an AWS Lambda function |
aws_lambda_cost | dollars | The elaboration cost of an AWS Lambda function |
aws_lambda_reserved_concurrency | instances | The maximum number of concurrent instances for an AWS Lambda function |
aws_lambda_provisioned_concurrency | instances | The number of prepared environments for an AWS Lambda function |
aws_lambda_memory_size |
| integer | 128 | 128 → 10240 | no | The memory size allocated for an AWS Lambda function |
aws_lambda_reserved_concurrency |
| integer | 100 | 0→ 1000 | no | The maximum number of concurrent instances for an AWS Lambda function |
aws_lambda_provisioned_concurrency | integer | 0 | 0→100 | no | The number of prepared environments for an AWS Lambda function |
cpu_util | percent | The average CPU utilization % across all the CPUs (i.e., how much time on average the CPUs are busy doing work) |
network_in_bytes_details | bytes/s | The number of inbound network packets in bytes per second broken down by network device (e.g., wlp4s0) |
network_out_bytes_details | bytes/s | The number of outbound network packets in bytes per second broken down by network device (e.g., eth01) |
disk_read_bytes | bytes/s | The number of bytes per second read across all disks |
disk_write_bytes | bytes/s | The number of bytes per second written across all disks |
aws_ec2_disk_iops_reads | ops/s | The per second average number of EBS IO disk-read operations summed across all disks |
aws_ec2_disk_iops_writes | ops/s | The per second average number of EBS IO disk-write operations summed across all disks |
aws_ec2_disk_iops | ops/s | The per second average number of EBS IO disk operations summed across all disks |
aws_ec2_credits_cpu_available | credits | The number of earned CPU credits that an instance has accrued since it was launched or started. Credits are accrued in the credit balance after they are earned, and removed from the credit balance when they are spent |
aws_ec2_credits_cpu_used | credits | The number of CPU credits spent by the instance for CPU utilization |
aws_ec2_ebs_credits_io_util | percent | The percentage of I/O credits remaining in the burst bucket |
aws_ec2_ebs_credits_bytes_util | percent | The percentage of throughput credits remaining in the burst bucket |
aws_ec2_price | dollars | AWS EC2 hourly instance price (on-demand) |
aws_ec2_instance_type | Categorical |
|
| yes | Instance types comprise varying combinations of CPU, memory, storage, and networking capacity, optimized to fit different use cases |
aws_ec2_instance_size | Ordinal |
|
| yes |
| Domain of aws_ec2_instance_size here is: [4xlarge, 8xlarge, 9xlarge]. Since "c5" instance type does not support 8xlarge instance size, and "m5" instance family does not support the 9xlarge one, this option is enforced with a constraint that allows only c5.4xlarge, c5.9xlarge, m5.4xlarge, and m5.8xlarge configurations |
pg_connections | connections | The number of connections in the db. |
pg_start_time | seconds | The total amount time spent by postresql to boot up. |
pg_commits | commits/s | The number of transactions committed per second. |
pg_rollbacks | rollbacks/s | The number of transactions rollbacked per second. |
pg_checkpoint_executed | checkpoints/s | The total number of checkpoint operations executed by postgresql. |
pg_disk_used | bytes | The amount of disk space used by postgresql. |
pg_blocks_read | blocks/s | The number of blocks read per second by postgresql. |
pg_blocks_cache_hit | blocks/s | Number of blocks found in the buffer cache. |
pg_backend_fsync_count | syncs | The total number of times postgresql executed a sync of data to disk. |
pg_effective_io_concurrency | integer | iops |
|
| no | The number of simultaneous requests that can be handled efficiently by the disk subsystem. |
pg_bgwriter_delay | integer | milliseconds |
|
| no | The delay between activity rounds for the background writer. |
pg_bgwriter_lru_maxpages | integer | buffers |
|
| no | The maximum number of LRU pages to flush per round by the background writer. |
pg_checkpoint_completion_target | real |
|
|
| no | The time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval. |
pg_effective_cache_size | integer | kilobytes |
|
| no | The planner's assumption about the effective size of the disk cache available to a single query. A higher value makes it more likely index scans will be used, a lower value makes it more likely sequential scans will be used. |
PostgeSQL 11 |
PostgeSQL 12 |
Cassandra NoSQL database version 3 |
The MySQL optimization pack allows the user to monitor a MySQL instance and explore the configuration space of its parameters. The optimization pack provides parameters and metrics that can be leveraged to reach, among others, two main goals:
Throughput optimization - increasing the capacity of a MySQL deployment to serve clients
Cost optimization - decreasing the size of a MySQL deployment while guaranteeing the same service level
To reach the aforementioned goals, the optimization pack focuses on three key areas of tuning of the InnoDB, the storage engine for MySQL:
Buffer management
Threading
Paging
The following table describes the supported component types by the MySQL optimization pack.
| Component Type | Description |
|---|---|
Here’s the command to install the MySQL optimization-pack using the Akamas CLI:
The Oracle Database optimization pack allows monitoring of an Oracle instance and exploring the configuration space of its initialization parameters. In this way, an Akamas study can achieve goals such as maximizing the throughput of an Oracle-backed application or minimizing its resource consumption, thus reducing costs.
The main tuning areas covered by the parameters provided in this optimization pack are:
SGA memory management
PGA memory management
SQL plan optimization
Approximate query execution
The optimization pack also includes metrics to monitor:
Memory allocation and utilization
Sessions
Query executions
Wait events
These component types model different Oracle Database releases, either as on-premise or cloud solutions. They provide the initialization parameters the workflow can apply through the OracleConfigurator operator, and a set of metrics to monitor the instance performances.
Notice that for the Oracle Database hosted on Amazon RDS, a subset of initialization parameters can be applied in the workflow to interact with the RDS API interface.
| Component Type | Description |
|---|---|
Here’s the command to install the Oracle Database optimization pack using the Akamas CLI:
The optimization pack for Oracle Database 12c.
| Metric | Unit | Description |
|---|---|---|
The following parameters require their ranges or default values to be updated according to the described rules:
The following tables show a list of constraints that may be required in the definition of the study, depending on the tuned parameters.
The MongoDB optimization pack helps you optimize instances of MongoDB to reach the desired performance goal. The optimization pack provides parameters and metrics specific to MongoDB that can be leveraged to reach, among others, two main goals:
Throughput optimization - increasing the capacity of a MongoDB deployment to serve clients
Cost optimization - decreasing the size of a MongoDB deployment while guaranteeing the same service level
To reach such goals the pack focuses mostly on the parameters managing the cache, being one of the elements that impact performances the most; in particular, the optimization pack provides parameters to control the lifecycle and the size of the MongoDB’s cache thus significantly impacting performance.
Even though it is possible to evaluate performance improvements of MongoDB by looking at the business application that uses it as its database, looking at the end to end throughput or response time or using a performance test like , the optimization pack provides internal MongoDB metrics that can shed a light too on how MongoDB is performing, in particular in terms of throughput, for example:
The number of documents inserted in the database per second
The number of active connections
The optimization pack supports the following version of MongoDB.
| Component Type | Description |
|---|
Here’s the command to install the MongoDB optimization-pack using the Akamas CLI:
The Elasticsearch optimization pack provides support for optimizing Elasticsearch NoSQL databases.
The following component types are supported for Elasticsearch NoSQL databases.
| Component Type | Description |
|---|
Here’s the command to install the Elasticsearch optimization pack using the Akamas CLI:
| Parameter | Type | Unit | Default value | Domain | Description | Restart |
|---|---|---|---|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Metric | Unit | Description |
|---|---|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|---|---|---|---|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|---|---|---|---|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|---|---|---|---|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|---|---|---|---|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|---|---|---|---|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|---|---|---|---|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|---|---|---|---|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|---|---|---|---|---|
| Formula | Notes |
|---|---|
| Formula | Notes |
|---|---|
MySQL 8.0 Database, deployed on-premises.
Oracle Database 12c
Oracle Database 18c
Oracle Database 19c
Oracle Database 11g on Amazon RDS
Oracle Database 12c on Amazon RDS
mysql_aborted_connection
connections
The number of failed attempts to connect to the MySQL
mysql_connections_current
connections
The current number of connection opened towards MySql
mysql_connections_max
connections
The maximum number of connections that can be opened towards MySQL
mysql_innodb_buffer_pool_size
bytes
The size of the memory area where InnoDB caches tables and indexes
mysql_mem_usage
bytes
MySQL instance memory consumption divided by type (innodb_buffer_pool_data, innodb_log_buffer, query_cache, key_buffer_size)
mysql_query_throughput
queries/s
The number of queries per second processed by mysql
mysql_slow_query_rate
querys/s
The rate of queries that are considered slow based on parameters mysql_long_query_time and mysql_long_query_min_examined_row
mysql_statements_rate
statements/s
The rate at which each type of statement (select, insert, update, delete) executed per second.
mysql_threads_running
threads
The number of threads running in the MySQL instance
mysql_transactions_rate
transactions
The rate at which each type of transaction (handler label) is executed (commit. rollback, prepare, savepoint)
network_in_bytes_rate
bytes/s
The number of network inbound data in bytes per second
network_out_bytes_rate
bytes/s
The number of network outbound data in bytes per second
mysql_innodb_buffer_pool_size
integer
bytes
134217728
5242880 → 25769803776
The size of the buffer pool used by InnoDB to cache tables and indexes in memory
no
mysql_innodb_buffer_pool_instances
integer
regions
8
1→64
The number of regions that the InnoDB buffer pool is divided into
no
mysql_innodb_thread_sleep_delay
integer
milliseconds
10000
0 → 1000000
The number of milliseconds each InnoDB thread sleeps before joining the InnoDB queue
no
mysql_innodb_flush_method
string
-
fsync
fsync
O_DSYNC
littlesync
nosync
O_DIRECT
O_DIRECT_NO_FSYNC
The method used to flush data to InnoDB's datafiles and log files
yes
mysql_innodb_log_file_size
integer
bytes
50331648
4194304 →5368709120
The size of each log file in each log group maintained by InnoDB. The total size of log files cannot exceed 4GB.
yes
mysql_innodb_thread_concurrency
integer
threads
0
0 → 1000
The limit on the number of os threads used by InnoDB to serve user requests
no
mysql_innodb_max_dirty_pages_pct
real
percentage
10.0
0.0 → 99.99
The limit on the percentage of dirty pages in the buffer pool of InnoDB
no
mysql_innodb_read_ahead_threshold
integer
pages
56
0 → 64
The number of sequentially read pages after which MySQL initiates an async read of the following extend (a group of pages within a tablespace)
no
mysql_innodb_adaptive_hash_index
-
ON
ON
OFF
Whether or not enable the adaptive hash index optimization for InnoDB tables
no
mysql_innodb_fill_factor
integer
percentage
100
10→100
The percentage of each B-tree page that is filled during a sorted index build
no
read_rate
ops/s
Read queries per second
read_response_time_p99
milliseconds
99th percentile of read queries response time
read_response_time_avg
milliseconds
Average response time of read queries
write_rate
ops/s
Write queries per second
write_response_time_p99
milliseconds
99th percentile of write queries response time
read_response_time_max
milliseconds
Maximum response time of read queries
total_rate
ops/s
Total queries per second
write_response_time_avg
milliseconds
Average response time of write queries
write_response_time_max
milliseconds
Maximum response time of write queries
read_response_time_p90
milliseconds
90th percentile of read queries response time
write_response_time_p90
milliseconds
90th percentile of write queries response time
cassandra_compactionStrategy
categorical
SizeTieredCompactionStrategy
LeveledCompactionStrategy, SizeTieredCompactionStrategy, TimeWindowCompactionStrategy
yes
Compaction strategy in use
cassandra_concurrentReads
integer
32
2 → 128
yes
Concurrent Reads
cassandra_concurrentWrites
integer
32
2 → 128
yes
Concurrent Writes
cassandra_fileCacheSizeInMb
integer
megabytes
512
128 → 4096
yes
Total memory to use for SSTable-reading buffers
cassandra_memtableCleanupThreshold
real
0.11
0.01 → 0.99
yes
Ratio used for automatic memtable flush
cassandra_concurrentCompactors
integer
2
1 → 32
yes
Sets the number of concurrent compaction processes allowed to run simultaneously on a node
cassandra_commitlog_compression
categorical
NoCompressor
NoCompressor, LZ4Compressor, SnappyCompressor, DeflateCompressor
Sets the compression of commit log
cassandra_commitlog_segment_size_in_mb
integer
megabytes
32
8 → 32
Sets the segment size of commit log
cassandra_compaction_throughput_mb_per_sec
integer
megabytes/s
16
0 → 999
Sets the number of throughput for compaction
cassandra_commitlog_sync_period_in_ms
integer
milliseconds
10000
1 → 25000
Sets the sync period of commit log
oracle_sga_total_size
bytes
The current memory size of the SGA.
oracle_sga_free_size
bytes
The amount of SGA currently available.
oracle_sga_max_size
bytes
The configured maximum memory size for the SGA.
oracle_pga_target_size
bytes
The configured target memory size for the PGA.
oracle_redo_buffers_size
bytes
The memory size of the redo buffers.
oracle_default_buffer_cache_size
bytes
The memory size for the DEFAULT buffer cache component.
oracle_default_2k_buffer_cache_size
bytes
The memory size for the DEFAULT 2k buffer cache component.
oracle_default_4k_buffer_cache_size
bytes
The memory size for the DEFAULT 4k buffer cache component.
oracle_default_8k_buffer_cache_size
bytes
The memory size for the DEFAULT 8k buffer cache component.
oracle_default_16k_buffer_cache_size
bytes
The memory size for the DEFAULT 16k buffer cache component.
oracle_default_32k_buffer_cache_size
bytes
The memory size for the DEFAULT 32k buffer cache component.
oracle_keep_buffer_cache_size
bytes
The memory size for the KEEP buffer cache component.
oracle_recycle_buffer_cache_size
bytes
The memory size for the RECYCLE buffer cache component.
oracle_asm_buffer_cache_size
bytes
The memory size for the ASM buffer cache component.
oracle_shared_io_pool_size
bytes
The memory size for the IO pool component.
oracle_java_pool_size
bytes
The memory size for the Java pool component.
oracle_large_pool_size
bytes
The memory size for the large pool component.
oracle_shared_pool_size
bytes
The memory size for the shared pool component.
oracle_streams_pool_size
bytes
The memory size for the streams pool component.
oracle_buffer_cache_hit_ratio
percent
How often a requested block has been found in the buffer cache without requiring disk access.
oracle_wait_class_commit
percent
The percentage of time spent waiting on the events of class 'Commit'.
oracle_wait_class_concurrency
percent
The percentage of time spent waiting on the events of class 'Concurrency'.
oracle_wait_class_system_io
percent
The percentage of time spent waiting on the events of class 'System I/O'.
oracle_wait_class_user_io
percent
The percentage of time spent waiting on the events of class 'User I/O'.
oracle_wait_class_other
percent
The percentage of time spent waiting on the events of class 'Other'.
oracle_wait_class_scheduler
percent
The percentage of time spent waiting on the events of class 'Scheduler'.
oracle_wait_class_idle
percent
The percentage of time spent waiting on the events of class 'Idle'.
oracle_wait_class_application
percent
The percentage of time spent waiting on the events of class 'Application'.
oracle_wait_class_network
percent
The percentage of time spent waiting on the events of class 'Network'.
oracle_wait_class_configuration
percent
The percentage of time spent waiting on the events of class 'Configuration'.
oracle_wait_event_log_file_sync
percent
The percentage of time spent waiting on the 'log file sync' event.
oracle_wait_event_log_file_parallel_write
percent
The percentage of time spent waiting on the 'log file parallel write' event.
oracle_wait_event_log_file_sequential_read
percent
The percentage of time spent waiting on the 'log file sequential read' event.
oracle_wait_event_enq_tx_contention
percent
The percentage of time spent waiting on the 'enq: TX - contention' event.
oracle_wait_event_enq_tx_row_lock_contention
percent
The percentage of time spent waiting on the 'enq: TX - row lock contention' event.
oracle_wait_event_latch_row_cache_objects
percent
The percentage of time spent waiting on the 'latch: row cache objects' event.
oracle_wait_event_latch_shared_pool
percent
The percentage of time spent waiting on the 'latch: shared pool' event.
oracle_wait_event_resmgr_cpu_quantum
percent
The percentage of time spent waiting on the 'resmgr:cpu quantum' event.
oracle_wait_event_sql_net_message_from_client
percent
The percentage of time spent waiting on the 'SQL*Net message from client' event.
oracle_wait_event_rdbms_ipc_message
percent
The percentage of time spent waiting on the 'rdbms ipc message' event.
oracle_wait_event_db_file_sequential_read
percent
The percentage of time spent waiting on the 'db file sequential read' event.
oracle_wait_event_log_file_switch_checkpoint_incomplete
percent
The percentage of time spent waiting on the 'log file switch (checkpoint incomplete)' event.
oracle_wait_event_row_cache_lock
percent
The percentage of time spent waiting on the 'row cache lock' event.
oracle_wait_event_buffer_busy_waits
percent
The percentage of time spent waiting on the 'buffer busy waits' event.
oracle_wait_event_db_file_async_io_submit
percent
The percentage of time spent waiting on the 'db file async I/O submit' event.
oracle_sessions_active_user
sessions
The number of active user sessions.
oracle_sessions_inactive_user
sessions
The number of inactive user sessions.
oracle_sessions_active_background
sessions
The number of active background sessions.
oracle_sessions_inactive_background
sessions
The number of inactive background sessions.
oracle_calls_execute_count
calls
Total number of calls (user and recursive) that executed SQL statements.
oracle_tuned_undoretention
seconds
The amount of time for which undo will not be recycled from the time it was committed.
oracle_max_query_length
seconds
The length of the longest query executed.
oracle_transaction_count
transactions
The total number of transactions executed within the period.
oracle_sso_errors
errors/s
The number of ORA-01555 (snapshot too old) errors raised per second.
oracle_redo_log_space_requests
requests
The number of times a user process waits for space in the redo log file, usually caused by checkpointing or log switching.
bitmap_merge_area_size
kilobytes
1048576
0 → 2147483647
yes
The amount of memory Oracle uses to merge bitmaps retrieved from a range scan of the index.
create_bitmap_area_size
megabytes
8388608
0 → 1073741824
yes
Size of create bitmap buffer for bitmap index. Relevant only for systems containing bitmap indexes.
db_block_size
bytes
8192
2048 → 32768
yes
The size of Oracle database blocks. The value of this parameter can be changed only when the database is first created.
db_cache_size
megabytes
48
0 → 2097152
no
The size of the DEFAULT buffer pool for standard block size buffers. The value must be at least 4M * cpu number.
db_2k_cache_size
megabytes
0
0 → 2097152
no
Size of cache for 2K buffers.
db_4k_cache_size
megabytes
0
0 → 2097152
no
Size of cache for 4K buffers.
db_8k_cache_size
megabytes
0
0 → 2097152
no
Size of cache for 8K buffers.
db_16k_cache_size
megabytes
0
0 → 2097152
no
Size of cache for 16K buffers.
db_32k_cache_size
megabytes
0
0 → 2097152
no
Size of cache for 32K buffers.
hash_area_size
kilobytes
131072
0 → 2147483647
yes
Maximum size of in-memory hash work area maximum amount of memory.
java_pool_size
megabytes
24
0 → 65536
no
The size of the Java pool. If SGA_TARGET is set, this value represents the minimum value for the memory pool.
large_pool_size
megabytes
0
0 → 65536
no
The size of large pool allocation heap.
lock_sga
FALSE
TRUE, FALSE
yes
Lock the entire SGA in physical memory.
memory_max_target
megabytes
8192
152 → 2097152
yes
The maximum value to which a DBA can set the MEMORY_TARGET initialization parameter.
memory_target
megabytes
6144
0 → 2097152
no
Oracle systemwide usable memory. The database tunes memory to the MEMORY_TARGET value, reducing or enlarging the SGA and PGA as needed.
pga_aggregate_limit
megabytes
2048
0 → 4194304
no
The limit on the aggregate PGA memory consumed by the instance.
pga_aggregate_target
megabytes
1024
0 → 4194304
no
The target aggregate PGA memory available to all server processes attached to the instance.
result_cache_max_result
percent
5
0 → 100
no
Maximum result size as a percent of cache the size.
result_cache_max_size
megabytes
0
0 → 65536
no
The maximum amount of SGA memory that can be used by the Result Cache.
result_cache_remote_expiration
minutes
0
0 → 10000
no
The expiration in minutes of remote objects. High values may cause stale answers.
sga_max_size
megabytes
8192
0 → 2097152
yes
The maximum size of the SGA for the lifetime of the instance.
sga_min_size
megabytes
2920
0 → 1048576
no
The guaranteed SGA size for a pluggable database (PDB). When SGA_MIN_SIZE is set for a PDB, it guarantees the specified SGA size for the PDB.
sga_target
megabytes
5840
0 → 2097152
no
The total size of all SGA components, acts as the minimum value for the size of the SGA.
shared_pool_reserved_size
megabytes
128
1 → 2048
yes
The shared pool space reserved for large contiguous requests for shared pool memory.
shared_pool_size
megabytes
0
0 → 65536
no
The size of the shared pool.
sort_area_retained_size
kilobytes
0
0 → 2147483647
no
The maximum amount of the User Global Area memory retained after a sort run completes.
sort_area_size
kilobytes
64
0 → 8388608
no
The maximum amount of memory Oracle will use for a sort. If more space is required then temporary segments on disks are used.
streams_pool_size
megabytes
0
0 → 65536
no
Size of the streams pool.
use_large_pages
TRUE
ONLY, FALSE, TRUE
yes
Enable the use of large pages for SGA memory.
commit_logging
BATCH
IMMEDIATE, BATCH
no
Control how redo is batched by Log Writer.
log_archive_max_processes
processes
4
1 → 30
no
Maximum number of active ARCH processes.
log_buffer
megabytes
16
2 → 8192
yes
The amount of memory that Oracle uses when buffering redo entries to a redo log file.
log_checkpoint_interval
blocks
0
0 → 2147483647
no
The maximum number of log file blocks between incremental checkpoints.
log_checkpoint_timeout
seconds
1800
0 → 2147483647
no
Maximum time interval between checkpoints. Guarantees a no buffer remains dirty for more than the specified time.
undo_retention
seconds
900
0 → 2147483647
no
Low threshold value of undo retention.
undo_management
AUTO
MANUAL, AUTO
yes
Instance runs in SMU mode if TRUE, else in RBU mode
temp_undo_enabled
FALSE
TRUE, FALSE
no
Split undo log into temporary (temporary objects) and permanent (persistent objects) undo log.
optimizer_adaptive_plans
FALSE
TRUE, FALSE
no
Controls adaptive plans, execution plans built with alternative choices based on collected statistics.
optimizer_adaptive_statistics
FALSE
TRUE, FALSE
no
Enable the optimizer to use adaptive statistics for complex queries.
optimizer_capture_sql_plan_baselines
FALSE
TRUE, FALSE
no
Automatic capture of SQL plan baselines for repeatable statements
optimizer_dynamic_sampling
2
0 → 11
no
Controls both when the database gathers dynamic statistics, and the size of the sample that the optimizer uses to gather the statistics.
optimizer_features_enable
11.2.0.4
11.2.0.4.1, 11.2.0.4, 11.2.0.3, 11.2.0.2, 11.2.0.1, 11.1.0.7, 11.1.0.6, 10.2.0.5, 10.2.0.4, 10.2.0.3, 10.2.0.2, 10.2.0.1, 10.1.0.5, 10.1.0.4, 10.1.0.3, 10.1.0, 9.2.0.8, 9.2.0, 9.0.1, 9.0.0, 8.1.7, 8.1.6, 8.1.5, 8.1.4, 8.1.3, 8.1.0, 8.0.7, 8.0.6, 8.0.5, 8.0.4, 8.0.3, 8.0.0
no
Enable a series of optimizer features based on an Oracle release number.
optimizer_index_caching
0
0 → 100
no
Adjust the behavior of cost-based optimization to favor nested loops joins and IN-list iterators.
optimizer_index_cost_adj
100
1 → 10000
no
Tune optimizer behavior for access path selection to be more or less index friendly.
optimizer_inmemory_aware
TRUE
TRUE, FALSE
no
Enables all of the optimizer cost model enhancements for in-memory.
optimizer_mode
ALL_ROWS
ALL_ROWS, FIRST_ROWS, FIRST_ROWS_1, FIRST_ROWS_10, FIRST_ROWS_100, FIRST_ROWS_1000
no
The default behavior for choosing an optimization approach for the instance.
optimizer_use_invisible_indexes
FALSE
TRUE, FALSE
no
Enable or disables the use of invisible indexes.
optimizer_use_pending_statistics
FALSE
TRUE, FALSE
no
Control whether the optimizer uses pending statistics when compiling SQL statements.
optimizer_use_sql_plan_baselines
TRUE
TRUE, FALSE
no
Enables the use of SQL plan baselines stored in SQL Management Base.
approx_for_aggregation
FALSE
TRUE, FALSE
no
Replace exact query processing for aggregation queries with approximate query processing.
approx_for_count_distinct
FALSE
TRUE, FALSE
no
Automatically replace COUNT (DISTINCT expr) queries with APPROX_COUNT_DISTINCT queries.
approx_for_percentile
NONE
NONE, PERCENTILE_CONT, PERCENTILE_CONT DETERMINISTIC, PERCENTILE_DISC, PERCENTILE_DISC DETERMINISTIC, ALL, ALL DETERMINISTIC
no
Converts exact percentile functions to their approximate percentile function counterparts.
parallel_max_servers
processes
0
0 → 32767
no
The maximum number of parallel execution processes and parallel recovery processes for an instance.
parallel_min_servers
processes
0
0 → 2000
no
The minimum number of execution processes kept alive to service parallel statements.
parallel_threads_per_cpu
2
1 → 128
no
Number of parallel execution threads per CPU.
cpu_count
cpus
0
0 → 512
no
Number of CPUs available for the Oracle instance to use.
db_files
files
200
100 → 20000
yes
The maximum number of database files that can be opened for this database. This may be subject to OS constraints.
open_cursors
cursors
50
0 → 65535
no
The maximum number of open cursors (handles to private SQL areas) a session can have at once.
open_links
connections
4
0 → 32768
yes
The maximum number of concurrent open connections to remote databases in one session.
open_links_per_instance
connections
4
0 → 2147483647
yes
Maximum number of migratable open connections globally for each database instance.
processes
processes
800
6 → 20000
yes
The maximum number of OS user processes that can simultaneously connect to Oracle.
read_only_open_delayed
FALSE
TRUE, FALSE
yes
Delay opening of read only files until first access.
sessions
sessions
1262
1 → 65536
no
The maximum number of sessions that can be created in the system, effectively the maximum number of concurrent users in the system.
transactions
transactions
1388
4 → 2147483647
yes
The maximum number of concurrent transactions.
audit_sys_operations
FALSE
TRUE, FALSE
yes
Enable sys auditing
audit_trail
NONE
NONE, OS, DB, DB, EXTENDED, XML, XML, EXTENDED
yes
Configure system auditing.
gcs_server_processes
processes
0
0 → 100
yes
The number of background GCS server processes to serve the inter-instance traffic among Oracle RAC instances.
java_jit_enabled
TRUE
TRUE, FALSE
no
Enables the Just-in-Time (JIT) compiler for the Oracle Java Virtual Machine.
fast_start_mttr_target
seconds
0
0 → 3600
no
number of seconds the database should take to perform crash recovery of a single instance. This parameter impacts the time between checkpoints.
recyclebin
ON
ON, OFF
no
Allow recovering of dropped tables.
statistics_level
TYPICAL
BASIC, TYPICAL, ALL
no
Level of collection for database and operating system statistics.
transactions_per_rollback_segment
5
1 → 10000
yes
Expected number of active transactions per rollback segment.
filesystemio_options
asynch
none, setall, directIO, asynch
yes
Specifies I/O operations for file system files.
Parameter
Default value
Domain
db_cache_size
MAX(48MB, 4MB * cpu_num)
java_pool_size
24MB if SGA_TARGET is not set
0 if SGA_TARGET is set, meaning the lower bound for the pool is automatically determined
shared_pool_reserved_size
5% of shared_pool_size
shared_pool_size
0 if sga_target is set, 128MB otherwise
shared_pool_reserved_size
upper bound can’t exceed half the size of shared_pool_size
pga_aggregate_target
MAX(10MB, 0.2*sga_target)
pga_aggregate_limit
MEMORY_MAX_TARGET if MEMORY_TARGET explicit or
2 * PGA_AGGREGATE_TARGET if PGA_AGGREGATE_TARGET explicit or
0.9 * ({MEMORY_AVAILABLE} - SGA)
at least MAX(2GB, 3MB * db.processes)
hash_area_size
2 * sort_area_size
Parameter
Default value
Domain
cpu_count
should match the available CPUs 0 to let the Oracle engine automatically determine the value
must not exceed the available CPUs
gcs_server_processes
0 if cluster_database=false
1 for 1-3 CPUs, or if ASM
2 for 4-15 CPUs2+lower(CPUs/32) for 16+ CPUs
parallel_min_servers
CPU_COUNT * PARALLEL_THREADS_PER_CPU * 2
parallel_max_servers
PARALLEL_THREADS_PER_CPU * CPU_COUNT * concurrent_parallel_users * 5
sessions
1.1 * processes + 5
must be at least equal to the default value
transactions
1.1 * sessions
db.memory_target <= db.memory_max_target && db.memory_max_target < {MEMORY_AVAILABLE}
Add when tuning automatic memory management
db.sga_max_size + db.pga_aggregate_limit <= db.memory_max_target
Add when tuning SGA and PGA
db.sga_target + db.pga_aggregate_target <= db.memory_target
Add when tuning SGA and PGA
db.sga_target <= db.sga_max_size
Add when tuning SGA
db.db_cache_size + db.java_pool_size + db.large_pool_size + db.log_buffer + db.shared_pool_size + db.streams_pool_size < db.sga_max_size
Add when tuning SGA areas
db.pga_aggregate_target <= db.pga_aggregate_limit
Add when tuning PGA
db.shared_pool_reserved_size <= 0.5 * db.shared_pool_size
db.sort_area_retained_size <= db.sort_area_size
db.sessions < db.transactions
db.parallel_min_servers < db.parallel_max_servers
es_cluster_search_query_time | milliseconds | The average search query time of elasticsearch |
es_cluster_search_query_throughput | queries/s | The throughput of elasticsearch in terms of search queries per second |
es_cluster_active_shards | shards | The total number of active shards (including replica shards) across all indices within the elasticsearch cluster |
es_cluster_status | flag | The status of the elasticsearch search cluster, red = 0, yellow = 1, green = 2 |
es_cluster_out_packets | packets/s | The number of packets per second transmitted outside of the elasticsearch cluster |
es_cluster_out_bytes | bytes/s | The number of bytes per second transmitted outside of the elasticsearch cluster |
es_cluster_in_packets | packets/s | The number of packets per second received by the elasticsearch cluster |
es_cluster_in_bytes | bytes/s | The number of bytes per second received by the elasticsearch cluster |
es_node_process_open_files | files | The total number of file descriptors opened by the elasticsearch process within the elasticsearch node |
es_node_process_cpu_util | percentage | The CPU utilization % of the elasticsearch process within the elasticsearch node |
es_node_process_jvm_gc_duration | milliseconds | The average duration of jvm garbage collection for the eleasticearch process |
es_node_process_jvm_gc_count | gcs | The total number of jvm garbage collections that have occurred for the elasticsearch process in the node |
index_merge_scheduler_max_thread_count | integer | threads |
|
| ElasticSearch max number of threads for merge operations |
indices_store_throttle_max_bytes_per_sec | integer | bytes/s |
|
| ElasticSearch max bandwidth for store operations. |
index_translog_flush_threshold_size | integer | megabytes |
|
| ElasticSearch flush threshold size. |
index_refresh_interval | integer | seconds |
|
| ElasticSearch refresh interval. |
index_number_of_shards | integer | shards |
|
| ElasticSearch number of shards. |
index_number_of_replicas | integer | replicas |
|
| ElasticSearch number of replicas. |
MongoDB version 4.x |
MongoDB version 5.x |
ElasticSearch NoSQL database version 6 |
The Spark optimization pack allows tuning applications running on the Apache Spark framework. Through this optimization pack, Akamas is able to explore the space of the Spark parameters in order to find the configurations that best optimize the allocated resources or the execution time.
To achieve these goals the optimization pack provides parameters that focus on the following areas:
Driver and executors' resources allocation
Parallelism
Shuffling
Spark SQL
Similarly, the bundled metrics provide visibility on the following statistics from the Spark History Server:
Execution time
Executors' resource usage
Garbage collection time
| Component Type | Description |
|---|---|
Here’s the command to install the Spark optimization pack using the Akamas CLI:
The optimization pack for Oracle Database 11g on Amazon RDS.
| Metric | Unit | Description |
|---|
The following parameters require their ranges or default values to be updated according to the described rules.
The following tables show a list of constraints that may be required in the definition of the study, depending on the tuned parameters:
This page describes the Optimization Pack for Spark Application 2.2.0.
| Metric | Unit | Desciption |
|---|
| Metric | Unit | Description |
|---|
The following tables show a list of constraints that may be required in the definition of the study, depending on the tuned parameters:
The overall resources allocated to the application should be constrained by a maximum and, sometimes, a minimum value:
the maximum value could be the sum of resources physically available in the cluster, or a lower limit to allow the concurrent execution of other applications
an optional minimum value could be useful to avoid configurations that allocate executors that are both small and scarce
This page describes the Optimization Pack for MongoDb version 4.x.
| Name | Unit | Description |
|---|
| Name | Unit | Description |
|---|
Here are some constraints on parameters of MongoDB 4 that avoid common errors in the configuration of a MongoDB deployment:
| Metric | Unit | Description |
|---|
| Metric | Unit | Description |
|---|
| Metric | Unit | Description |
|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Default value | Domain | Restart | Description |
|---|
| Parameter | Default value | Domain |
|---|
| Parameter | Default value | Domain |
|---|
| Formula | Notes |
|---|
| Formula | Notes |
|---|
| Metric | Unit | Description |
|---|
| Metric | Unit | Description |
|---|
| Parameter | Unit | Type | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Type | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Type | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Type | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Type | Default value | Domain | Restart | Description |
|---|
| Parameter | Unit | Type | Default value | Domain | Restart | Description |
|---|
| Name | Unit | Type | Default | Domain | Restart | Description |
|---|
| Name | Unit | Type | Default | Domain | Restart | Description |
|---|
| Constraint |
|---|
Spark Application 2.2.0
Spark Application 2.3.0
Spark Application 2.4.0
oracle_sga_total_size | bytes | The current memory size of the SGA. |
oracle_sga_free_size | bytes | The amount of SGA currently available. |
oracle_sga_max_size | bytes | The configured maximum memory size for the SGA. |
oracle_pga_target_size | bytes | The configured target memory size for the PGA. |
oracle_redo_buffers_size | bytes | The memory size of the redo buffers. |
oracle_default_buffer_cache_size | bytes | The memory size for the DEFAULT buffer cache component. |
oracle_default_2k_buffer_cache_size | bytes | The memory size for the DEFAULT 2k buffer cache component. |
oracle_default_4k_buffer_cache_size | bytes | The memory size for the DEFAULT 4k buffer cache component. |
oracle_default_8k_buffer_cache_size | bytes | The memory size for the DEFAULT 8k buffer cache component. |
oracle_default_16k_buffer_cache_size | bytes | The memory size for the DEFAULT 16k buffer cache component. |
oracle_default_32k_buffer_cache_size | bytes | The memory size for the DEFAULT 32k buffer cache component. |
oracle_keep_buffer_cache_size | bytes | The memory size for the KEEP buffer cache component. |
oracle_recycle_buffer_cache_size | bytes | The memory size for the RECYCLE buffer cache component. |
oracle_asm_buffer_cache_size | bytes | The memory size for the ASM buffer cache component. |
oracle_shared_io_pool_size | bytes | The memory size for the IO pool component. |
oracle_java_pool_size | bytes | The memory size for the Java pool component. |
oracle_large_pool_size | bytes | The memory size for the large pool component. |
oracle_shared_pool_size | bytes | The memory size for the shared pool component. |
oracle_streams_pool_size | bytes | The memory size for the streams pool component. |
oracle_buffer_cache_hit_ratio | percent | How often a requested block has been found in the buffer cache without requiring disk access. |
oracle_wait_class_commit | percent | The percentage of time spent waiting on the events of class 'Commit'. |
oracle_wait_class_concurrency | percent | The percentage of time spent waiting on the events of class 'Concurrency'. |
oracle_wait_class_system_io | percent | The percentage of time spent waiting on the events of class 'System I/O'. |
oracle_wait_class_user_io | percent | The percentage of time spent waiting on the events of class 'User I/O'. |
oracle_wait_class_other | percent | The percentage of time spent waiting on the events of class 'Other'. |
oracle_wait_class_scheduler | percent | The percentage of time spent waiting on the events of class 'Scheduler'. |
oracle_wait_class_idle | percent | The percentage of time spent waiting on the events of class 'Idle'. |
oracle_wait_class_application | percent | The percentage of time spent waiting on the events of class 'Application'. |
oracle_wait_class_network | percent | The percentage of time spent waiting on the events of class 'Network'. |
oracle_wait_class_configuration | percent | The percentage of time spent waiting on the events of class 'Configuration'. |
oracle_wait_event_log_file_sync | percent | The percentage of time spent waiting on the 'log file sync' event. |
oracle_wait_event_log_file_parallel_write | percent | The percentage of time spent waiting on the 'log file parallel write' event. |
oracle_wait_event_log_file_sequential_read | percent | The percentage of time spent waiting on the 'log file sequential read' event. |
oracle_wait_event_enq_tx_contention | percent | The percentage of time spent waiting on the 'enq: TX - contention' event. |
oracle_wait_event_enq_tx_row_lock_contention | percent | The percentage of time spent waiting on the 'enq: TX - row lock contention' event. |
oracle_wait_event_latch_row_cache_objects | percent | The percentage of time spent waiting on the 'latch: row cache objects' event. |
oracle_wait_event_latch_shared_pool | percent | The percentage of time spent waiting on the 'latch: shared pool' event. |
oracle_wait_event_resmgr_cpu_quantum | percent | The percentage of time spent waiting on the 'resmgr:cpu quantum' event. |
oracle_wait_event_sql_net_message_from_client | percent | The percentage of time spent waiting on the 'SQL*Net message from client' event. |
oracle_wait_event_rdbms_ipc_message | percent | The percentage of time spent waiting on the 'rdbms ipc message' event. |
oracle_wait_event_db_file_sequential_read | percent | The percentage of time spent waiting on the 'db file sequential read' event. |
oracle_wait_event_log_file_switch_checkpoint_incomplete | percent | The percentage of time spent waiting on the 'log file switch (checkpoint incomplete)' event. |
oracle_wait_event_row_cache_lock | percent | The percentage of time spent waiting on the 'row cache lock' event. |
oracle_wait_event_buffer_busy_waits | percent | The percentage of time spent waiting on the 'buffer busy waits' event. |
oracle_wait_event_db_file_async_io_submit | percent | The percentage of time spent waiting on the 'db file async I/O submit' event. |
oracle_sessions_active_user | sessions | The number of active user sessions. |
oracle_sessions_inactive_user | sessions | The number of inactive user sessions. |
oracle_sessions_active_background | sessions | The number of active background sessions. |
oracle_sessions_inactive_background | sessions | The number of inactive background sessions. |
oracle_calls_execute_count | calls | Total number of calls (user and recursive) that executed SQL statements. |
oracle_tuned_undoretention | seconds | The amount of time for which undo will not be recycled from the time it was committed. |
oracle_max_query_length | seconds | The length of the longest query executed. |
oracle_transaction_count | transactions | The total number of transactions executed within the period. |
oracle_sso_errors | errors/s | The number of ORA-01555 (snapshot too old) errors raised per second. |
oracle_redo_log_space_requests | requests | The number of times a user process waits for space in the redo log file, usually caused by checkpointing or log switching. |
bitmap_merge_area_size | kilobytes |
|
| yes | The amount of memory Oracle uses to merge bitmaps retrieved from a range scan of the index. |
create_bitmap_area_size | megabytes |
|
| yes | Size of create bitmap buffer for bitmap index. Relevant only for systems containing bitmap indexes. |
db_cache_size | megabytes |
|
| no | The size of the DEFAULT buffer pool for standard block size buffers. The value must be at least 4M * cpu number. |
hash_area_size | kilobytes |
|
| yes | Maximum size of in-memory hash work area maximum amount of memory. |
java_pool_size | megabytes |
|
| no | The size of the Java pool. If SGA_TARGET is set, this value represents the minimum value for the memory pool. |
large_pool_size | megabytes |
|
| no | The size of large pool allocation heap. |
memory_max_target | megabytes |
|
| yes | The maximum value to which a DBA can set the MEMORY_TARGET initialization parameter. |
memory_target | megabytes |
|
| no | Oracle systemwide usable memory. The database tunes memory to the MEMORY_TARGET value, reducing or enlarging the SGA and PGA as needed. |
olap_page_pool_size | bytes |
|
| no | Size of the olap page pool. |
pga_aggregate_limit | megabytes |
|
| no | The limit on the aggregate PGA memory consumed by the instance. |
pga_aggregate_target | megabytes |
|
| no | The target aggregate PGA memory available to all server processes attached to the instance. |
pre_page_sga |
|
|
| yes | Read the entire SGA into memory at instance startup. |
result_cache_max_result | percent |
|
| no | Maximum result size as a percent of the cache size. |
result_cache_max_size | megabytes |
|
| no | The maximum amount of SGA memory that can be used by the Result Cache. |
result_cache_mode |
|
|
| no | Specifies when a ResultCache operator is spliced into a query's execution plan. |
result_cache_remote_expiration | minutes |
|
| no | The expiration in minutes of remote objects. High values may cause stale answers. |
sga_max_size | megabytes |
|
| yes | The maximum size of the SGA for the lifetime of the instance. |
sga_min_size | megabytes |
|
| no | The guaranteed SGA size for a pluggable database (PDB). When SGA_MIN_SIZE is set for a PDB, it guarantees the specified SGA size for the PDB. |
sga_target | megabytes |
|
| no | The total size of all SGA components, acts as the minimum value for the size of the SGA. |
shared_pool_reserved_size | megabytes |
|
| yes | The shared pool space reserved for large contiguous requests for shared pool memory. |
shared_pool_size | megabytes |
|
| no | The size of the shared pool. |
sort_area_retained_size | kilobytes |
|
| no | The maximum amount of the User Global Area memory retained after a sort run completes. |
sort_area_size | kilobytes |
|
| no | The maximum amount of memory Oracle will use for a sort. If more space is required then temporary segments on disks are used. |
streams_pool_size | megabytes |
|
| no | Size of the streams pool. |
use_large_pages |
|
|
| yes | Enable the use of large pages for SGA memory. |
workarea_size_policy |
|
|
| no | Policy used to size SQL working areas (MANUAL/AUTO). |
commit_logging |
|
|
| no | Control how redo is batched by Log Writer. |
log_archive_max_processes | processes |
|
| no | Maximum number of active ARCH processes. |
log_buffer | megabytes |
|
| yes | The amount of memory that Oracle uses when buffering redo entries to a redo log file. |
log_checkpoint_interval | blocks |
|
| no | The maximum number of log file blocks between incremental checkpoints. |
log_checkpoint_timeout | seconds |
|
| no | Maximum time interval between checkpoints. Guarantees a no buffer remains dirty for more than the specified time. |
db_flashback_retention_target | minutes |
|
| no | Maximum Flashback Database log retention time. |
undo_retention | seconds |
|
| no | Low threshold value of undo retention. |
optimizer_capture_sql_plan_baselines |
|
|
| no | Automatic capture of SQL plan baselines for repeatable statements |
optimizer_dynamic_sampling |
|
|
| no | Controls both when the database gathers dynamic statistics, and the size of the sample that the optimizer uses to gather the statistics. |
optimizer_features_enable |
|
|
| no | Enable a series of optimizer features based on an Oracle release number. |
optimizer_index_caching |
|
|
| no | Adjust the behavior of cost-based optimization to favor nested loops joins and IN-list iterators. |
optimizer_index_cost_adj |
|
|
| no | Tune optimizer behavior for access path selection to be more or less index friendly. |
optimizer_mode |
|
|
| no | The default behavior for choosing an optimization approach for the instance. |
optimizer_secure_view_merging |
|
|
| no | Enables security checks when the optimizer uses view merging. |
optimizer_use_invisible_indexes |
|
|
| no | Enable or disables the use of invisible indexes. |
optimizer_use_pending_statistics |
|
|
| no | Control whether the optimizer uses pending statistics when compiling SQL statements. |
optimizer_use_sql_plan_baselines |
|
|
| no | Enables the use of SQL plan baselines stored in SQL Management Base. |
parallel_degree_policy |
|
|
| no | Policy used to compute the degree of parallelism (MANUAL/LIMITED/AUTO). |
parallel_execution_message_size |
|
|
| yes | Message buffer size for parallel execution. |
parallel_force_local |
|
|
| no | Force single instance execution. |
parallel_max_servers | processes |
|
| no | The maximum number of parallel execution processes and parallel recovery processes for an instance. |
parallel_min_servers | processes |
|
| no | The minimum number of execution processes kept alive to service parallel statements. |
parallel_min_percent | percent |
|
| yes | The minimum percentage of parallel execution processes (of the value of PARALLEL_MAX_SERVERS) required for parallel execution. |
circuits | circuits |
|
| no | The total number of virtual circuits that are available for inbound and outbound network sessions. |
cpu_count | cpus |
|
| no | Number of CPUs available for the Oracle instance to use. |
cursor_bind_capture_destination |
|
|
| no | Allowed destination for captured bind variables. |
cursor_sharing |
|
|
| no | Cursor sharing mode. |
cursor_space_for_time |
|
|
| yes | Use more memory in order to get faster execution. |
db_files | files |
|
| yes | The maximum number of database files that can be opened for this database. This may be subject to OS constraints. |
open_cursors | cursors |
|
| no | The maximum number of open cursors (handles to private SQL areas) a session can have at once. |
open_links | connections |
|
| yes | The maximum number of concurrent open connections to remote databases in one session. |
open_links_per_instance | connections |
|
| yes | Maximum number of migratable open connections globally for each database instance. |
processes | processes |
|
| yes | The maximum number of OS user processes that can simultaneously connect to Oracle. |
serial_reuse |
|
|
| yes | Types of cursors that make use of the serial-reusable memory feature. |
session_cached_cursors |
|
|
| no | Number of session cursors to cache. |
session_max_open_files |
|
|
| yes | Maximum number of open files allowed per session. |
sessions | sessions |
|
| no | The maximum number of sessions that can be created in the system, effectively the maximum number of concurrent users in the system. |
transactions | transactions |
|
| yes | The maximum number of concurrent transactions. |
aq_tm_processes |
|
|
| no | Number of AQ Time Managers to start. |
audit_sys_operations |
|
|
| yes | Enable sys auditing |
audit_trail |
|
|
| yes | Configure system auditing. |
client_result_cache_lag | milliseconds |
|
| yes | Maximum time before checking the database for changes related to the queries cached on the client. |
client_result_cache_size | kilobytes |
|
| yes | The maximum size of the client per-process result set cache. |
db_block_checking |
|
|
| no | Header checking and data and index block checking. |
db_block_checksum |
|
|
| no | Store checksum in db blocks and check during reads. |
db_file_multiblock_read_count |
|
|
| no | Db block to be read each IO. |
db_keep_cache_size | megabytes |
|
| no | Size of KEEP buffer pool for standard block size buffers. |
db_lost_write_protect |
|
|
| no | Enable lost write detection. |
db_recovery_file_dest_size | megabytes |
|
| no | Database recovery files size limit. |
db_recycle_cache_size | megabytes |
|
| no | Size of RECYCLE buffer pool for standard block size buffers. |
db_writer_processes |
|
|
| yes | Number of background database writer processes to start. |
ddl_lock_timeout |
|
|
| no | Timeout to restrict the time that ddls wait for dml lock. |
deferred_segment_creation |
|
|
| no | Defer segment creation to first insert. |
distributed_lock_timeout | seconds |
|
| yes | Number of seconds a distributed transaction waits for a lock. |
dml_locks |
|
|
| yes | The maximum number of DML locks - one for each table modified in a transaction. |
enable_goldengate_replication |
|
|
| no | Enable GoldenGate replication. |
fast_start_parallel_rollback |
|
|
| no | Max number of parallel recovery slaves that may be used. |
hs_autoregister |
|
|
| no | Enable automatic server DD updates in HS agent self-registration. |
java_jit_enabled |
|
|
| no | Enables the Just-in-Time (JIT) compiler for the Oracle Java Virtual Machine. |
java_max_sessionspace_size | bytes |
|
| yes | Max allowed size in bytes of a Java sessionspace. |
java_soft_sessionspace_limit | bytes |
|
| yes | Warning limit on size in bytes of a Java sessionspace. |
job_queue_processes |
|
|
| no | Maximum number of job queue slave processes. |
object_cache_max_size_percent | percent |
|
| no | Percentage of maximum size over optimal of the user sessions object cache. |
object_cache_optimal_size | kilobytes |
|
| no | Optimal size of the user sessions object cache. |
plscope_settings |
|
|
| no | Plscope_settings controls the compile-time collection, cross reference, and storage of PL/SQLsourcecode identifier data. |
plsql_code_type |
|
|
| no | PL/SQL code-type. |
plsql_optimize_level |
|
|
| no | PL/SQL optimize level. |
query_rewrite_enabled |
|
|
| no | Allow rewrite of queries using materialized views if enabled. |
query_rewrite_integrity |
|
|
| no | Perform rewrite using materialized views with desired integrity. |
remote_dependencies_mode |
|
|
| no | Remote-procedure-call dependencies mode parameter. |
replication_dependency_tracking |
|
|
| yes | Tracking dependency for Replication parallel propagation. |
resource_limit |
|
|
| no | Enforce resource limits in database profiles. |
resourcemanager_cpu_allocation |
|
|
| no | ResourceManager CPU allocation. |
resumable_timeout | seconds |
|
| no | Enables resumable statements and specifies resumable timeout at the system level. |
sql_trace |
|
|
| no | Enable SQL trace. |
star_transformation_enabled |
|
|
| no | Enable the use of star transformation. |
timed_os_statistics |
|
|
| no | The interval at which Oracle collects operating system statistics. |
timed_statistics |
|
|
| no | Maintain internal timing statistics. |
trace_enabled |
|
|
| no | Enable in-memory tracing. |
transactions_per_rollback_segment |
|
|
| yes | Expected number of active transactions per rollback segment. |
|
|
|
|
|
|
|
|
|
|
|
|
|
| upper bound can’t exceed half the size of |
|
|
|
|
| at least |
|
|
|
| should match the available CPUs 0 to let the Oracle engine automatically determine the value | must not exceed the available CPUs |
|
|
|
|
|
|
|
|
|
|
| must be at least equal to the default value |
|
|
|
| Add when tuning automatic memory management |
| Add when tuning SGA and PGA |
| Add when tuning SGA and PGA |
| Add when tuning SGA |
| Add when tuning SGA areas |
| Add when tuning PGA |
|
|
|
|
|
|
|
|
spark_application_duration | milliseconds | The duration of the Spark application |
spark_job_duration | milliseconds | The duration of the job |
spark_stage_duration | milliseconds | The duration of the stage |
spark_task_duration | milliseconds | The duration of the task |
spark_driver_rdd_blocks | blocks | The total number of persisted RDD blocks for the driver |
spark_driver_mem_used | bytes | The total amount of memory used by the driver |
spark_driver_disk_used | bytes | The total amount of disk used for RDDs by the driver |
spark_driver_cores | cores | The total number of concurrent tasks that can be run by the driver |
spark_driver_total_input_bytes | bytes | The total number of bytes read from RDDs or persisted data by the driver |
spark_driver_total_tasks | tasks | The total number of tasks run for each the driver |
spark_driver_total_duration | milliseconds | The total amount of time spent by the driver running tasks |
spark_driver_max_mem_used | bytes | The maximum amount of memory used by the driver |
spark_driver_total_jvm_gc_duration | milliseconds | The total amount of time spent by the driver's JVM doing garbage across all tasks |
spark_driver_total_shuffle_read | bytes | The total number of bytes read during a shuffle by the driver |
spark_driver_total_shuffle_write | bytes | The total number of bytes written in shuffle operations by the driver |
spark_driver_used_on_heap_storage_memory | bytes | The amount of on-heap memory used by the driver |
spark_driver_used_off_heap_storage_memory | bytes | The amount of off-heap memory used by the driver |
spark_driver_total_on_heap_storage_memory | bytes | The total amount of available on-heap memory for the driver |
spark_driver_total_off_heap_storage_memory | bytes | The total amount of available off-heap memory for the driver |
spark_executor_max_count | executors | The maximum number of executors used for the application |
spark_executor_rdd_blocks | blocks | The total number of persisted RDD blocks for each executor |
spark_executor_mem_used | bytes | The total amount of memory used by each executor |
spark_executor_disk_used | bytes | The total amount of disk used for RDDs by each executor |
spark_executor_cores | cores | The number of cores used by each executor |
spark_executor_total_input_bytes | bytes | The total number of bytes read from RDDs or persisted data by each executor |
spark_executor_total_tasks | tasks | The total number of tasks run for each the executor |
spark_executor_total_duration | milliseconds | The total amount of time spent by each executor running tasks |
spark_executor_max_mem_used | bytes | The maximum amount of memory used by each executor |
spark_executor_total_jvm_gc_duration | milliseconds | The total amount of time spent by each executor's JVM doing garbage collection across all tasks |
spark_executor_total_shuffle_read | bytes | The total number of bytes read during a shuffle by each executor |
spark_executor_total_shuffle_write | bytes | The total number of bytes written in shuffle operations by each executor |
spark_executor_used_on_heap_storage_memory | bytes | The amount of on-heap memory used by each executor |
spark_executor_used_off_heap_storage_memory | bytes | The amount of off-heap memory used by each executor |
spark_executor_total_on_heap_storage_memory | bytes | The total amount of available on-heap memory for each executor |
spark_executor_total_off_heap_storage_memory | bytes | The total amount of available off-heap memory for each executor |
spark_stage_shuffle_read_bytes | bytes | The total number of bytes read in shuffle operations by each stage |
spark_task_jvm_gc_duration | milliseconds | The total duration of JVM garbage collections for each task |
spark_task_peak_execution_memory | bytes | The sum of the peak sizes across internal data structures created for each task |
spark_task_result_size | bytes | The size of the result of the computation of each task |
spark_task_result_serialization_time | milliseconds | The time spent by each task serializing the computation result |
spark_task_shuffle_read_fetch_wait_time | milliseconds | The time spent by each task waiting for remote shuffle blocks |
spark_task_shuffle_read_local_blocks_fetched | blocks | The total number of local blocks fetched in shuffle operations by each task |
spark_task_shuffle_read_local_bytes | bytes | The total number of bytes read in shuffle operations from local disk by each task |
spark_task_shuffle_read_remote_blocks_fetched | blocks | The total number of remote blocks fetched in shuffle operations by each task |
spark_task_shuffle_read_remote_bytes | bytes | The total number of remote bytes read in shuffle operations by each task |
spark_task_shuffle_read_remote_bytes_to_disk | bytes | The total number of remote bytes read to disk in shuffle operations by each task |
spark_task_shuffle_write_time | nanoseconds | The time spent by each task writing data on disk or on buffer caches during shuffle operations |
spark_task_executor_deserialize_time | nanoseconds | The time spent by the executor deserializing the task |
spark_task_executor_deserialize_cpu_time | nanoseconds | The CPU time spent by the executor deserializing the task |
spark_task_stage_shuffle_write_records | records | The total number of records written in shuffle operations broken down by task and stage |
spark_task_stage_shuffle_write_bytes | records | The total number of bytes written in shuffle operations broken down by task and stage |
spark_task_stage_shuffle_read_records | records | The total number of records read in shuffle operations broken down by task and stage |
spark_task_stage_disk_bytes_spilled | bytes | The total number of bytes spilled on disk broken down by task and stage |
spark_task_stage_memory_bytes_spilled | bytes | The total number of bytes spilled on memory broken down by task and stage |
spark_task_stage_input_bytes_read | bytes | The total number of bytes read, broken down by task and stage |
spark_task_stage_input_records_read | records | The total number of records read, broken down by task and stage |
spark_task_stage_output_bytes_written | bytes | The total number of bytes written, broken down by task and stage |
spark_task_stage_output_records_written | records | The total number of records written, broken down by task and stage |
spark_task_stage_executor_run_time | nanoseconds | The time spent by each executor actually running tasks (including fetching shuffle data) broken down by task, stage and executor |
spark_task_stage_executor_cpu_time | nanoseconds | The CPU time spent by each executor actually running each task (including fetching shuffle data) broken down by task and stage |
driverCores | integer | cores | You should select your own default | You should select your own domain | yes | The number of CPU cores assigned to the driver in cluster deploy mode. |
numExecutors | integer | executors | You should select your own default | You should select your own domain | yes | Number of executors to use. YARN only. |
totalExecutorCores | integer | cores | You should select your own default | You should select your own domain | yes | Total number of cores for the application. Spark standalone and Mesos only. |
executorCores | integer | cores | You should select your own default | You should select your own domain | yes | Number of CPU cores for an executor. Spark standalone and YARN only. |
defaultParallelism | integer | partitions | You should select your own default | You should select your own domain | yes | Default number of partitions in RDDs returned by transformations like join, reduceByKey, and parallelize when not set by user. |
broadcastBlockSize | integer | kilobytes |
|
| yes | Size of each piece of a block for TorrentBroadcastFactory. |
schedulerMode | categorical |
|
| yes | Define the scheduling strategy across jobs. |
driverMemory | integer | megabytes | You should select your own default | You should select your own domain | yes | Amount of memory to use for the driver process. |
yarnDriverMemoryOverhead | integer | megabytes |
|
| yes | Off-heap memory to be allocated per driver in cluster mode. Currently supported in YARN and Kubernetes. |
executorMemory | integer | megabytes | You should select your own default | You should select your own domain | yes | Amount of memory to use per executor. |
yarnExecutorMemoryOverhead | integer | megabytes |
|
| yes | Off-heap memory to be allocated per executor. Currently supported in YARN and Kubernetes. |
memoryOffHeapEnabled | categorical |
|
| yes | If true, Spark will attempt to use off-heap memory for certain operations. |
memoryOffHeapSize | integer | megabytes |
|
| yes | The absolute amount of memory in bytes which can be used for off-heap allocation. |
reducerMaxSizeInFlight | integer | megabytes |
|
| yes | Maximum size of map outputs to fetch simultaneously from each reduce task in MB. |
shuffleFileBuffer | integer | kilobytes |
|
| yes | Size of the in-memory buffer for each shuffle file output stream in KB. |
shuffleCompress | categorical |
|
| yes | Whether to compress map output files. |
shuffleServiceEnabled | categorical |
|
| yes | Enables the external shuffle service. This service preserves the shuffle files written by executors so the executors can be safely removed. |
dynamicAllocationEnabled | categorical |
|
| yes | Whether to use dynamic resource allocation, which scales the number of executors registered with this application up and down based on the workload. Requires spark.shuffle.service.enabled to be set. |
dynamicAllocationExecutorIdleTimeout | integer |
|
| yes | If dynamic allocation is enabled and an executor has been idle for more than this duration, the executor will be removed. |
dynamicAllocationInitialExecutors | integer | executors | You should select your own default | You should select your own domain | yes | Initial number of executors to run if dynamic allocation is enabled. |
dynamicAllocationMinExecutors | integer | executors | You should select your own default | You should select your own domain | yes | Lower bound for the number of executors if dynamic allocation is enabled. |
dynamicAllocationMaxExecutors | integer | executors | You should select your own default | You should select your own domain | yes | Upper bound for the number of executors if dynamic allocation is enabled. |
sqlInMemoryColumnarStorageCompressed | categorical |
|
| yes | When set to true Spark SQL will automatically select a compression codec for each column based on statistics of the data. |
sqlInMemoryColumnarStorageBatchSize | integer | records |
|
| yes | Controls the size of batches for columnar caching. Larger batch sizes can improve memory utilization and compression, but risk OOMs when caching data. |
sqlFilesMaxPartitionBytes | integer | bytes |
|
| yes | The maximum number of bytes to pack into a single partition when reading files. |
sqlFilesOpenCostInBytes | integer | bytes |
|
| yes | The estimated cost to open a file, measured by the number of bytes could be scanned in the same time. This is used when putting multiple files into a partition. |
compressionLz4BlockSize | integer | bytes |
|
| yes | Block size in bytes used in LZ4 compression. |
serializer | categorical |
|
| yes | Class to use for serializing objects that will be sent over the network or need to be cached in serialized form. |
kryoserializerBuffer | integer | bytes |
|
| yes | Initial size of Kryo's serialization buffer. Note that there will be one buffer per core on each worker. |
| The overall allocated memory should not exceed the specified limit |
| The overall allocated CPUs should not exceed the specified limit |
| The overall allocated memory should not exceed the specified limit |
| The overall allocated CPUs should not exceed the specified limit |
mongodb_document_deleted | documents/s | The average number of documents deleted per second |
mongodb_documents_inserted | documents/s | The average number of documents inserted per second |
mongodb_documents_updated | documents/s | The average number of documents updated per second |
mongodb_documents_returned | documents/s | The average number of documents returned by queries per second |
mongodb_connections_current | connections | The current number of opened connections |
mongodb_heap_used | bytes | The total size of heap space used (only available in Linux/Unix systems) |
mongodb_mem_used | bytes | The total amount of memory used |
mongodb_page_faults_total | faults/s | The average number of page faults per second (i.e., operations that require MongoDB to access data on disk rather than on memory) |
mongodb_global_lock_current_queue | ops | The current number of operations queued because of a lock |
mongodb_cache_size | megabytes | Integer | You should select your own default value when you create a study, since it is highly dependent on your system (how much memory your system has) | You should select your own default value when you create a study, since it is highly dependent on your system (how much memory your system has) | No | The maximum size of the internal cache that MongoDB (WiredTiger) will use to operate |
mongodb_eviction_trigger | percentage | Integer | 95 | 1 → 99 | No | The percentage threshold on the use of the MongoDB cache for which cache eviction will start and client threads will throttle |
mongodb_eviction_target | percentage | Integer | 80 | 1 → 99 | No | The target percentage usage of the MongoDB cache to reach after evictions |
mongodb_eviction_dirty_trigger | percentage | Integer | 20 | 1 → 99 | No | The percentage threshold on the use of MongoDB dirty cache for which cache eviction will start and client threads will throttle |
mongodb_eviction_dirty_target | percentage | Integer | 5 | 1 → 99 | No | The target percentage usage of the MongoDB dirty cache to reach after evictions |
mongodb_eviction_threads_min | threads | Integer | 4 | 1 → 20 | No | The minimum number of threads to use to perform cache eviction |
mongodb_eviction_threads_max | threads | Integer | 4 | 1 → 20 | No | The maximum number of threads to use to perform cache eviction |
mongodb_sync_delay | seconds | Integer | 1min | 1min → 6min | no | The temporal interval between fsync operations where mongod flushes its working memory to disk |
mongodb_eviction_threads_min <= mongodb_eviction_threads_max |
mongodb_eviction_dirty_target <= mongodb_eviction_target |
mongodb_eviction_dirty_trigger <= mongodb_eviction_trigger |
| Parameter | Type | Unit | Default | Domain | Restart | Description |
|---|---|---|---|---|---|---|
cm_maxPoolSize
integer
50
0 → 1000
yes
Maximum number of physical connections for a pool
cm_minPoolSize
integer
0
0 → 1000
yes
Minimum number of physical connections for a pool
cm_maxConnectionsPerThread
integer
1
0 → 30
yes
Maximum number of connections per thread
cm_numConnectionsPerThreadLocal
integer
1
0 → 30
yes
Maximum number of connections per local thread
cm_purgePolicy
categorical
EntirePool
EntirePool, FailingConnectionOnly, ValidateAllConnections
yes
Purge Policy
cm_connectionTimeout
categorical
30s
-1, 0, 5s, 10s, 30s, 60s, 90s, 120s
yes
Connection Timeout
cm_maxIdleTime
categorical
30m
-1, 1m, 5m, 10m, 15m, 30m
yes
Max Idle Time
cm_reapTime
categorical
3m
-1, 30s, 1m, 3m, 5m
yes
Reap Time
exe_coreThreads
integer
-1
-1, 4, 6, 8, 10, 12, 14, 16, 18, 20
yes
Number of core threads
exe_maxThreads
integer
-1
-1 → 200
yes
Max number of threads
db_minPoolSize
integer
0
0 → 1000
yes
Mimimum pool size
db_maxPoolSize
integer
50
0 → 1000
yes
Maximum pool size
db_connectionWaitTime
integer
180
0 → 3600
yes
Connection wait time