os.File.WriteAt
standard libraryThe 6092nd most-called standard-library method by production calls. Called 172 times across 64 modules; 98 of those run outside tests and generated code.
2% in production calls vs 2026-W37 (96 → 98)
- prod calls
- 98
- non-test, non-generated
- all calls
- 172
- total callsites
- modules
- 64
- distinct callers
- in loop
- 21%
- of prod calls
- in tests
- 43%
- 74 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 method95%A method on a value whose type is known exactly.
- Embedded method5%Reached through an embedded type.
who calls this
Notable callers
Production calls into File.WriteAt from notable Go projects. Open one on the map to see what else it hammers.
- containerd 8 8%
- etcd 4 4%
- Kubernetes 4 4%
- Docker 3 3%
- Grafana 2 2%
where it's called
Callsites in the wild
12 representative callsites of 172, prioritizing in-loop and non-test usage. We link to source, never display it.
- in loop
- in loop
- in loop
- in loop
-
benbjohnson/litestream @v0.5.17
in loop -
jetify-com/devbox @v0.0.0-20260916172240-9704c95c3294
in loop -
putyy/res-downloader @v0.0.0-20260812124208-f8ac4d9c85ba
in loop -
rclone/rclone @v1.75.1
in loop -
seaweedfs/seaweedfs @v0.0.0-20260921075935-e2608edda4f9
in loop -
superfly/ltx @v0.5.3
in loop -
tencentyun/cos-go-sdk-v5 @v0.7.75
in loop - in loop
top callers
The modules that reach for it
The modules that call File.WriteAt most in this snapshot.
- github.com/prometheus/prometheus2012%
- github.com/seaweedfs/seaweedfs1810%
- github.com/u-root/u-root106%
- github.com/containerd/continuity85%
- github.com/tencentyun/cos-go-sdk-v574%
siblings
More from os
The other most-called members in this package. See all →