io.MultiReader
standard libraryThe 2505th most-called standard-library function by production calls. Called 336 times across 153 modules; 245 of those run outside tests and generated code.
3% in production calls vs 2026-W37 (239 → 245)
- prod calls
- 245
- non-test, non-generated
- all calls
- 336
- total callsites
- modules
- 153
- distinct callers
- in loop
- 11%
- of prod calls
- in tests
- 27%
- 91 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 MultiReader from notable Go projects. Open one on the map to see what else it hammers.
- Gitea 16 7%
- Tailscale 7 3%
- containerd 4 2%
- Docker 3 1%
- Go (golang.org/x) 3 1%
where it's called
Callsites in the wild
12 representative callsites of 336, prioritizing in-loop and non-test usage. We link to source, never display it.
-
docker/cli @v29.8.1+incompatible
in loop - in loop
- in loop
-
google/gvisor @v0.0.0-20260919054224-26f3455a4cb9
in loop -
rclone/rclone @v1.75.1
in loop - in loop
- in loop
- in loop
-
tj/go-archive @v1.0.2
in loop -
tsenart/vegeta @v11.4.0+incompatible
in loop - in loop
- in loop
top callers
The modules that reach for it
The modules that call MultiReader most in this snapshot.
- gitea.dev175%
- github.com/go-gitea/gitea175%
- github.com/rclone/rclone124%
- github.com/benbjohnson/litestream82%
- github.com/tailscale/tailscale82%
siblings
More from io
The other most-called functions in this package. See all →