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callcount

runtime.NumCPU

standard library

The 1351st most-called standard-library function by production calls. Called 699 times across 222 modules; 461 of those run outside tests and generated code.

1% in production calls vs 2026-W37 (457 → 461)

All of runtime → Docs on pkg.go.dev ↗

prod calls
461
non-test, non-generated
all calls
699
total callsites
modules
222
distinct callers
in loop
2%
of prod calls
in tests
34%
238 calls
resolved
100%
to a known target

resolution mix

How each call resolves

How each call was attributed. Only resolved kinds, where the target function is known, count toward the ranking. Interface dispatch and unresolved receivers are reported separately and never guessed. Read the taxonomy →

  • Package function100%A direct call to an exported package function, resolved by type.

who calls this

Notable callers

Production calls into NumCPU from notable Go projects. Open one on the map to see what else it hammers.

where it's called

Callsites in the wild

12 representative callsites of 699, prioritizing in-loop and non-test usage. We link to source, never display it.

NumCPU · 12 of 699 callsites

top callers

The modules that reach for it

The modules that call NumCPU most in this snapshot.

  • github.com/cockroachdb/cockroach254%
  • github.com/photoprism/photoprism223%
  • github.com/hashicorp/nomad203%
  • github.com/cilium/workerpool172%
  • github.com/ethereum/go-ethereum152%

siblings

More from runtime

The other most-called functions in this package. See all →