chore: match Linux container CPU quota

Go is not cgroup aware and by default will set GOMAXPROCS to the number of available threads, regardless of whether it is within the allocated quota. This behaviour causes high amount of CPU throttling and degraded application performance. Fixes: #3735 Signed-off-by: Thomas Way <[email protected]>
prometheus · Feb 25, 2024 · 5aed3cf · 5aed3cf
1 parent efa801f
commit 5aed3cf
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diff --git a/cmd/alertmanager/main_test.go b/cmd/alertmanager/main_test.go
@@ -19,6 +19,7 @@ import (
 
  "github.com/go-kit/log"
  "github.com/stretchr/testify/require"
+ _ "go.uber.org/automaxprocs"
 )
 
 func TestExternalURL(t *testing.T) {

diff --git a/go.mod b/go.mod
@@ -85,6 +85,7 @@ require (
  go.opentelemetry.io/otel v1.17.0 // indirect
  go.opentelemetry.io/otel/metric v1.17.0 // indirect
  go.opentelemetry.io/otel/trace v1.17.0 // indirect
+ go.uber.org/automaxprocs v1.5.3 // indirect
  golang.org/x/crypto v0.18.0 // indirect
  golang.org/x/oauth2 v0.16.0 // indirect
  golang.org/x/sync v0.6.0 // indirect

diff --git a/go.sum b/go.sum
@@ -526,6 +526,8 @@ go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqe
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
 go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
+go.uber.org/automaxprocs v1.5.3 h1:kWazyxZUrS3Gs4qUpbwo5kEIMGe/DAvi5Z4tl2NW4j8=
+go.uber.org/automaxprocs v1.5.3/go.mod h1:eRbA25aqJrxAbsLO0xy5jVwPt7FQnRgjW+efnwa1WM0=
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
 go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=