NodeJS

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	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

Parameters

Parameter	Type	Unit	Default Value	Domain	Restart	Description
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