Node JS 18

This page describes the Optimization Pack for the component type NodeJS.

Metrics

Metric	Unit	Description
cpu_used	CPUs	The total amount of CPUs used
cpu_util	percent	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
nodejs_suspension_time	percent	Suspension time %
nodejs_active_handles	handles	Number of active libuv handles grouped by handle type. Every handle type is C++ class name
nodejs_active_handles_total	handles	Total number of active handles
nodejs_active_requests	requests	Number of active libuv requests grouped by request type. Every request type is C++ class name
nodejs_active_requests_total	requests	Total number of active requests
nodejs_eventloop_lag_max_seconds	seconds	The maximum recorded event loop delay
nodejs_eventloop_lag_mean_seconds	seconds	The mean of the recorded event loop delays
nodejs_eventloop_lag_min_seconds	seconds	The minimum recorded event loop delay
nodejs_eventloop_lag_p50_seconds	seconds	The 50th percentile of the recorded event loop delays
nodejs_eventloop_lag_p90_seconds	seconds	The 90th percentile of the recorded event loop delays
nodejs_eventloop_lag_p99_seconds	seconds	The 99th percentile of the recorded event loop delays
nodejs_eventloop_lag_seconds	seconds	Lag of event loop in seconds
nodejs_external_memory_bytes	bytes	NodeJS external memory size in bytes
nodejs_gc_duration_seconds_bucket	seconds	The total count of observations for a bucket in the histogram. Garbage collection duration by kind, one of major, minor, incremental or weakcb
nodejs_gc_duration_seconds_count	seconds	The total number of observations for Garbage collection duration by kind, one of major, minor, incremental or weakcb
nodejs_gc_duration_seconds_sum	seconds	The total sum of observations for Garbage collection duration by kind, one of major, minor, incremental or weakcb
nodejs_heap_size_total_bytes	bytes	Process heap size from NodeJS in bytes
nodejs_heap_size_used_bytes	bytes	Process heap size used from NodeJS in bytes
nodejs_heap_space_size_available_bytes	bytes	Process heap size available from NodeJS in bytes
nodejs_heap_space_size_total_bytes	bytes	Process heap space size total from NodeJS in bytes
nodejs_heap_space_size_used_bytes	bytes	Process heap space size used from NodeJS in bytes
process_cpu_seconds_total	seconds	Total user and system CPU time spent in seconds
process_cpu_system_seconds_total	seconds	Total system CPU time spent in seconds
process_cpu_user_seconds_total	seconds	Total user CPU time spent in seconds
process_heap_bytes	bytes	Process heap size in bytes
process_max_fds	fds	Maximum number of open file descriptors
process_open_fds	fds	Number of open file descriptors
process_resident_memory_bytes	bytes	Resident memory size in bytes
process_virtual_memory_bytes	bytes	Virtual memory size in bytes

Parameters

Parameter	Type	Unit	Default Value	Domain	restart	Description
v8_allocation_size_pretenuring	categorical		--allocation-site-pretenuring	--allocation-site-pretenuring, --no-allocation-site-pretenuring	yes	Pretenure with allocation sites
v8_min_semi_space_size	integer	megabytes	0	0 → 1048576	yes	Min size of a semi-space (in MBytes), the new space consists of two semi-spaces
v8_max_semi_space_size	integer	megabytes	0	0 → 1048576	yes	Max size of a semi-space (in MBytes), the new space consists of two semi-spaces. This parameter is equivalent to v8_max_semi_space_size_ordinal.
v8_max_semi_space_size_ordinal	ordinal	megabytes	16	2, 4, 6, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768	yes	Max size of a semi-space (in MBytes), the new space consists of two semi-spaces. This parameter is equivalent to v8_max_semi_space_size but forces power of 2 values.
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 (in Mbytes)
v8_max_heap_size	integer	megabytes	0	0 → 1048576	yes	Max size of the heap (in Mbytes) 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 (in Mbytes)
v8_initial_old_space_size	integer	megabytes	0	0 → 1048576	yes	Initial old space size (in Mbytes)
v8_parallel_scavenge	categorical		--parallel-scavenge	--parallel-scavenge, --no-parallel-scavenge	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		--no-scavenge-separate-stack-scanning	--scavenge-separate-stack-scanning, --no-scavenge-separate-stack-scanning	yes	Use a separate phase for stack scanning in scavenge
v8_concurrent_marking	categorical		--concurrent-marking	--concurrent-marking, --no-concurrent-marking	yes	Use concurrent marking
v8_parallel_marking	categorical		--parallel-marking	--parallel-marking, --no-parallel-marking	yes	Use parallel marking in atomic pause
v8_concurrent_sweeping	categorical		--concurrent-sweeping	--concurrent-sweeping, --no-concurrent-sweeping	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	kilobytes	0	0 → 1048576	yes	Override OS page size (in KBytes)
v8_stack_size	integer	kilobytes	984	16 → 1048576	yes	Default size of stack region v8 is allowed to use (in kBytes)
v8_single_threaded	categorical		--no-single-threaded	--single-threaded, --no-single-threaded	yes	Disable the use of background tasks
v8_single_threaded_gc	categorical		--no-single-threaded-gc	--single-threaded-gc, --no-single-threaded-gc	yes	Disable the use of background gc tasks