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callcount

io/fs.FS.Open

standard library

The 2684th most-called standard-library method by production calls. Called 294 times across 98 modules; 232 of those run outside tests and generated code.

No change in production calls since 2026-W39.

All of io/fs → Docs on pkg.go.dev ↗

prod calls
232
non-test, non-generated
all calls
294
total callsites
modules
98
distinct callers
in loop
8%
of prod calls
in tests
21%
62 calls
resolved
1%
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 →

  • Embedded method<1%Reached through an embedded type.
  • Interface method99%Called through an interface. The runtime target may differ.

who calls this

Notable callers

Production calls into FS.Open 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 294, prioritizing in-loop and non-test usage. We link to source, never display it.

FS.Open · 12 of 294 callsites

top callers

The modules that reach for it

The modules that call FS.Open most in this snapshot.

  • github.com/navidrome/navidrome3512%
  • github.com/aquasecurity/trivy3211%
  • github.com/containerd/containerd/v2186%
  • github.com/tailscale/tailscale72%
  • tailscale.com72%

siblings

More from io/fs

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