The Node JS runtime
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