Automatically set GOMAXPROCS to match the number of CPUs available to…

… the container

Signed-off-by: Rajat Vig <rajat.vig@gmail.com>
Signed-off-by: Rajat Vig <rvig@etsy.com>

changelogs/unreleased/5211-rajatvig-small.md

@@ -0,0 +1 @@
+Contour now sets GOMAXPROCS to match the number of CPUs available to the container which results in lower and more stable CPU usage under high loads and where the container and node CPU counts differ significantly.

cmd/contour/contour.go

@@ -14,6 +14,7 @@
 package main
 
 import (
+	"go.uber.org/automaxprocs/maxprocs"
 	"os"
 
 	"github.com/alecthomas/kingpin/v2"
@@ -29,6 +30,9 @@ func main() {
 	log := logrus.StandardLogger()
 	k8s.InitLogging(k8s.LogWriterOption(log.WithField("context", "kubernetes")))
 
+	// set GOMAXPROCS
+	maxprocs.Set(maxprocs.Logger(log.Printf))
+
 	// NOTE: when add a new subcommand, we'll have to remember to add it to 'TestOptionFlagsAreSorted'
 	// to ensure the option flags in lexicographic order.
 

go.mod

@@ -27,6 +27,7 @@ require (
 	github.com/stretchr/testify v1.8.2
 	github.com/tsaarni/certyaml v0.9.2
 	github.com/vektra/mockery/v2 v2.22.1
+	go.uber.org/automaxprocs v1.5.2
 	golang.org/x/oauth2 v0.6.0
 	gonum.org/v1/plot v0.12.0
 	google.golang.org/genproto v0.0.0-20230117162540-28d6b9783ac4

go.sum

@@ -327,6 +327,7 @@ github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZ
 github.com/pkg/sftp v1.13.1/go.mod h1:3HaPG6Dq1ILlpPZRO0HVMrsydcdLt6HRDccSgb87qRg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prashantv/gostub v1.1.0 h1:BTyx3RfQjRHnUWaGF9oQos79AlQ5k8WNktv7VGvVH4g=
 github.com/projectcontour/yages v0.1.0 h1:vcFpregOq5TVF0/AXLive1MY4CVMDkgL7/+qbUeIbDs=
 github.com/projectcontour/yages v0.1.0/go.mod h1:pcJrPa3dP17HwGj2YOfBZ4w5WmC1rSpv/X/sV4wauSw=
 github.com/prometheus/client_golang v1.14.0 h1:nJdhIvne2eSX/XRAFV9PcvFFRbrjbcTUj0VP62TMhnw=
@@ -412,6 +413,8 @@ go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
+go.uber.org/automaxprocs v1.5.2 h1:2LxUOGiR3O6tw8ui5sZa2LAaHnsviZdVOUZw4fvbnME=
+go.uber.org/automaxprocs v1.5.2/go.mod h1:eRbA25aqJrxAbsLO0xy5jVwPt7FQnRgjW+efnwa1WM0=
 go.uber.org/goleak v1.2.0 h1:xqgm/S+aQvhWFTtR0XK3Jvg7z8kGV8P4X14IzwN3Eqk=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 go.uber.org/multierr v1.8.0 h1:dg6GjLku4EH+249NNmoIciG9N/jURbDG+pFlTkhzIC8=