strings.Builder.WriteString
standard libraryThe 37th most-called standard-library method by production calls. Called 44,379 times across 696 modules; 33,485 of those run outside tests and generated code.
1% in production calls vs 2026-W37 (33,151 → 33,485)
- prod calls
- 33,485
- non-test, non-generated
- all calls
- 44,379
- total callsites
- modules
- 696
- distinct callers
- in loop
- 30%
- of prod calls
- in tests
- 6%
- 2,452 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.
estimate
Estimated relative cost
Roughly 0.01× the estimated relative cost of fmt.Sprintf . Benchmarked at 9.74 ns/op × 33,485 production calls, normalized so fmt.Sprintf = 1.0.
This is not dollars and not a verdict. Per-op time depends heavily on inputs (argument sizes, contention, patterns), the benchmark ran on a single machine (darwin/arm64 (Apple Silicon), go1.26.0), and static call counts are not runtime frequency. How this is estimated →
who calls this
Notable callers
Production calls into Builder.WriteString from notable Go projects. Open one on the map to see what else it hammers.
- Grafana 477 1%
- Kubernetes 455 1%
- Istio 396 1%
- Cilium 391 1%
- Go (golang.org/x) 263 <1%
where it's called
Callsites in the wild
12 representative callsites of 44,379, prioritizing in-loop and non-test usage. We link to source, never display it.
- in loop
- in loop
-
go/protovalidate @v1.4.0
validation_error.go:42
in loop -
bubbles/v2 @v2.2.1
help/help.go:157
in loop -
bubbletea/v2 @v2.0.9
cursed_renderer.go:796
in loop -
charm.land/fantasy @v0.44.0
model.go:64
in loop -
lipgloss/v2 @v2.0.6
ranges.go:25
in loop -
log/v2 @v2.0.1
text.go:82
in loop - in loop
-
cockroachdb/pebble/v2 @v2.1.7
in loop -
miekg/dns @v0.6.114
cmd/atomdns/internal/dnszone/node.go:27
in loop -
readeck/go-readability/v2 @v2.1.2
internal/re2go/normalize.go:82
in loop
top callers
The modules that reach for it
The modules that call Builder.WriteString most in this snapshot.
- github.com/elastic/go-elasticsearch/v87,46517%
- github.com/elastic/go-elasticsearch/v72,2305%
- github.com/bytebase/bytebase1,9564%
- github.com/elastic/go-elasticsearch/v61,5443%
- vitess.io/vitess1,5033%
siblings
More from strings
The other most-called members in this package. See all →