concurrency

Documentation

Index

• Variables
• func NoMoreThanNUMCPU(conc int) int

Variables

var (
	NUMCPU   = runtime.GOMAXPROCS(0)
	NUMCPUx2 = NUMCPU * 2
	NUMCPU_2 = NUMCPU / 2
)

Use runtime.GOMAXPROCS instead of runtime.NumCPU because NumCPU returns the physical CPU cores. However, in a containerization context, that might not be what we want. The physical node could have 128 cores, but we could be cgroup-limited to 2 cores. In that case, we want 2 to be our limit, not 128. It isn't guaranteed that MAXPROCS reflects the cgroup limit, but at least there is a chance that it was set correctly. If not, it defaults to NumCPU anyway, so we're not any worse off.

Functions

func NoMoreThanNUMCPU

func NoMoreThanNUMCPU(conc int) int