Does golang return memory to OS?

[DevRockstarZ]

What version of Go are you using (go version)?

$ go version
go version go1.15.3 linux/amd64

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/workspace/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/workspace"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/root/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/root/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build107808986=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I ran the server using golang, but the memory seems to be increasing and it killed by OOM-killer.
Server doesn't return memory to OS.
I set GOGC=50 / GOGC=200 and more, it doesn't seems to be good.
[203213.592974] Out of memory: Killed process 7547 (server) total-vm:40164060kB, anon-rss:31842000kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:68512kB oom_score_adj:0

What did you expect to see?

I expect server returns memory to OS.

[martisch]

Yes it does: https://golang.org/doc/go1.12#runtime See MADV_FREE.

Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions. GitHub Issues are used for tracking bugs and proposals only.

https://github.com/golang/go/wiki/Questions

[davecheney]

Please review #42330 and it’s linked issues.