system

Documentation

Index

• Constants
• func NumCPU() int

Constants

const CacheLineSize = max(
	int(unsafe.Sizeof(cpu.CacheLinePad{})),

	64-65*int(unsafe.Sizeof(cpu.CacheLinePad{})),
)

CacheLineSize is the size of a CPU cache line in bytes, or a non-zero estimate if the size is unknown.

Functions

func NumCPU

func NumCPU() int

NumCPU returns the number of logical CPUs usable by the current process.

!!Note!! If you are considering using this to scale parallelism with the machine size, use runtime.GOMAXPROCS(0) instead. The latter is better because GOMAXPROCS is reduced with certain test runs (with the race detector); it can also be reduced in containerized environments.

The set of available CPUs is checked by querying the operating system at process startup. Changes to operating system CPU allocation after process startup are not reflected.