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callcount

sync.RWMutex.RLock

standard library

The 59th most-called standard-library method by production calls. Called 22,387 times across 715 modules; 16,958 of those run outside tests and generated code.

All of sync → Docs on pkg.go.dev ↗

prod calls
16,958
non-test, non-generated
all calls
22,387
total callsites
modules
715
distinct callers
in loop
4%
of prod calls
in tests
9%
2,058 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 →

  • Concrete method82%A method on a value whose type is known exactly.
  • Embedded method18%Reached through an embedded type.

estimate

Experimental

Estimated relative cost

Roughly 0.00× the estimated relative cost of fmt.Sprintf . Benchmarked at 3.94 ns/op × 16,958 production calls, normalized so fmt.Sprintf = 1.0.

This is not dollars and not a verdict. Per-op time depends heavily on inputs (argument sizes, contention, patterns), the benchmark ran on a single machine (darwin/arm64 (Apple Silicon), go1.26.0), and static call counts are not runtime frequency. How this is estimated →

who calls this

Notable callers

Production calls into RWMutex.RLock 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 22,387, prioritizing in-loop and non-test usage. We link to source, never display it.

RWMutex.RLock · 12 of 22,387 callsites

top callers

The modules that reach for it

The modules that call RWMutex.RLock most in this snapshot.

  • github.com/hyperledger/fabric2,0839%
  • github.com/nats-io/nats-server/v21,3116%
  • github.com/livekit/livekit1,2526%
  • github.com/seaweedfs/seaweedfs5923%
  • github.com/kubernetes/kubernetes5472%

siblings

More from sync

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