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runtime: increased VmSize/VmData consumption #44999

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AlexBlack772 opened this issue Mar 14, 2021 · 5 comments
Closed

runtime: increased VmSize/VmData consumption #44999

AlexBlack772 opened this issue Mar 14, 2021 · 5 comments
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@AlexBlack772
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AlexBlack772 commented Mar 14, 2021 •
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What version of Go are you using (go version)?

go version go1.16.2 linux/amd64
CentOS Linux release 7.7.1908 (Core)
kernel-3.10.0-1062.el7.x86_64

Does this issue reproduce with the latest release?

yes

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

go env Output
$ go env
O111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/opt/go/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/opt/go/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.16.2"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/opt/go/go/go.mod"
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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build1972922996=/tmp/go-build -gno-record-gcc-switches"

What did you do?

A programm allocates some memory and than release it.

https://play.golang.org/p/Ljr0c6zRasB

What did you expect to see?

After golang version update to 1.16.2 I expect to see the same memory consumption as with go lang 1.13

With go lang 1.13 programm output was:

START VmSize:138Mb VmLck:0 VmPin:0 VmRSS:1 VmData:131 VmStk:0 VmExe:0 VmLib:1
VmSize:476Mb VmLck:0 VmPin:0 VmRSS:11 VmData:468 VmStk:0 VmExe:0 VmLib:1
VmSize:476Mb VmLck:0 VmPin:0 VmRSS:12 VmData:468 VmStk:0 VmExe:0 VmLib:1

What did you see instead?

With go lang 1.16.2 programm output is:

START VmSize:725Mb VmLck:0 VmPin:0 VmRSS:1 VmData:717 VmStk:0 VmExe:0 VmLib:1
VmSize:1321Mb VmLck:0 VmPin:0 VmRSS:21 VmData:1313 VmStk:0 VmExe:0 VmLib:1
VmSize:1321Mb VmLck:0 VmPin:0 VmRSS:22 VmData:1313 VmStk:0 VmExe:0 VmLib:1

Memory consumption is three times more in comparison with go lang 1.13 (VmSize:476Mb vs VmSize:1321Mb)
@AlexBlack772 AlexBlack772 changed the title GoLang update from 1.13->1.16 cause more VmData consumption GoLang update from 1.13->1.16 causes more VmData consumption Mar 14, 2021
@AlexBlack772 AlexBlack772 changed the title GoLang update from 1.13->1.16 causes more VmData consumption GoLang update from 1.13->1.16 causes more VmSize/VmData consumption Mar 14, 2021
@mdlayher mdlayher changed the title GoLang update from 1.13->1.16 causes more VmSize/VmData consumption runtime: increased VmSize/VmData consumption Mar 14, 2021
@AlexRouSg
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This sounds like #44554

@davecheney
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Duplicate of #44554

@davecheney davecheney marked this as a duplicate of #44554 Mar 15, 2021
@davecheney
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reopening at the OP's request

@davecheney davecheney reopened this Mar 18, 2021
@AlexBlack772
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AlexBlack772 commented Mar 18, 2021 •
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Issue #44554 talks about memory consumption increase in release 1.16 in comparison with release 1.15

My issue was about memory increase in 1.15, 1,16 releases in comparison with 1.13

I dig a bit more, here what I've found

For the sake of simplicity I used a test programm below

package main

import (
   "fmt"
   "io/ioutil"
)

func main() {
    contents, err := ioutil.ReadFile("/proc/self/status")
    if err != nil {
       fmt.Println("Error")
        return
     }

     fmt.Println(string(contents))
}

With release go1.13.15.linux-amd64.tar.gz (from page https://golang.org/dl/)

results are following

[root@localhost versions]# /mnt/ext-drive/go-ver/go1.13.15/bin/go run ./test.go
....

VmPeak: 102816 kB
VmSize: 102816 kB
.....

With release go1.14.linux-amd64.tar.gz memory usage increased 7 times

[root@localhost versions]# /mnt/ext-drive/go-ver/go1.14.0/bin/go run ./test.go

.....
VmPeak: 703080 kB
VmSize: 703080 kB
.....

[root@localhost versions]# cat /etc/centos-release
CentOS Linux release 7.7.1908 (Core)

@cherrymui
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As explained in #45000 (comment) , VmSize/VsData does not reflect actual physical memory resources used, and this is working as intended. Closing. Thanks.

cc @mknyszek in case I'm mistaken.

@golang golang locked and limited conversation to collaborators Mar 18, 2022
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@davecheney @AlexRouSg @gopherbot @cherrymui @AlexBlack772