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callcount

io.Writer.Write

standard library

The 21st most-called standard-library method by production calls. Called 1,360 times across 148 modules; 1,039 of those run outside tests and generated code.

15% in production calls vs 2026-06-sample (902 → 1,039)

All of io → Docs on pkg.go.dev ↗

prod calls
1,039
non-test, non-generated
all calls
1,360
total callsites
modules
148
distinct callers
in loop
15%
of prod calls
in tests
17%
230 calls
resolved
12%
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 method12%A method on a value whose type is known exactly.
  • Interface method71%Called through an interface. The runtime target may differ.
  • Unresolved17%Receiver typed by a dependency outside the crawl.

who calls this

Notable callers

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

where it's called

Callsites in the wild

6 representative callsites of 1,360, prioritizing in-loop and non-test usage. We link to source, never display it.

Writer.Write · 6 of 1,360 callsites

top callers

The modules that reach for it

The modules that call Writer.Write most in this snapshot.

  • k8s.io/apimachinery44333%
  • github.com/sirupsen/logrus31323%
  • github.com/spf13/cobra15611%

siblings

More from io

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