testing.T.Parallel
standard libraryThe 1824th most-called standard-library method by production calls. Called 79,663 times across 527 modules; 349 of those run outside tests and generated code.
No change in production calls since 2026-W39.
- prod calls
- 349
- non-test, non-generated
- all calls
- 79,663
- total callsites
- modules
- 527
- distinct callers
- in loop
- 14%
- of prod calls
- in tests
- 100%
- 79,314 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 method100%A method on a value whose type is known exactly.
- Embedded method<1%Reached through an embedded type.
who calls this
Notable callers
Production calls into T.Parallel from notable Go projects. Open one on the map to see what else it hammers.
- Docker 50 14%
- OpenTelemetry 13 4%
- Kubernetes 8 2%
- Tailscale 7 2%
- CockroachDB 2 <1%
where it's called
Callsites in the wild
12 representative callsites of 79,663, prioritizing in-loop and non-test usage. We link to source, never display it.
- in loop
- in loop
-
docker/docker @v28.5.2+incompatible
in loop - in loop
- in loop
- in loop
-
coder/coder @v0.27.3
in loop - in loop
-
golang-migrate/migrate @v3.5.4+incompatible
in loop - in loop
- in loop
-
google/gvisor @v0.0.0-20260927234935-6485c3fbdfe2
in loop
top callers
The modules that reach for it
The modules that call T.Parallel most in this snapshot.
- github.com/microsoft/typescript-go6,0628%
- github.com/gruntwork-io/terragrunt4,8146%
- github.com/go-openapi/testify/v22,9964%
- github.com/grafana/k62,6473%
- go.k6.io/k62,6473%
siblings
More from testing
The other most-called members in this package. See all →