runtime.findrunable cost 23% of cpu prof #22829
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There is work currently happening at improving some of this in Go master (Go 1.10). Please try the master branch and report any problems. (We won't be backporting performance things back to Go 1.8) Thanks! (I'm going to close this bug for now.) |
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Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (
go version)?go1.8.0
Does this issue reproduce with the latest release?
no
What operating system and processor architecture are you using (
go env)?GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/data12/home/xuegeng/go"
GORACE=""
GOROOT="/opt/tiger/go/go1.8.0"
GOTOOLDIR="/opt/tiger/go/go1.8.0/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build643110445=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
What did you do?
i run a mysql proxy ,which handle muti client request and sent these request to backend mysql.
i didn;t confrontend a error, but just the runtime.findrunable() func cost 23% cpu when i use pprof moniter my app.
What did you expect to see?
What did you see instead?
![Uploading runtime.findrunable .png…]()i see that runtime.findrunable() cost many cpu ，and most of them b used by net_poll and runqsteal , so i wander how should i do to reduse these coasts
most of my goruntime is waiting in
net.runtime_pollWait+0x58 (5849/5894)
in the most of time
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