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Description
What version of Go are you using (go version
)?
$ go version go version go1.17.1 linux/amd64
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 GO111MODULE="" GOARCH="amd64" GOBIN="" GOCACHE="/root/.cache/go-build" GOENV="/root/.config/go/env" GOEXE="" GOEXPERIMENT="" 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="/mnt/d/00.Tool/00.golang/go1.17" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/mnt/d/00.Tool/00.golang/go1.17/pkg/tool/linux_amd64" GOVCS="" GOVERSION="go1.17.1" GCCGO="gccgo" AR="ar" CC="gcc" CXX="g++" CGO_ENABLED="1" GOMOD="/mnt/d/01.Project/03.go_performance/demo/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-build2033964888=/tmp/go-build -gno-record-gcc-switches"
What did you do?
server.go:
package main
import (
"log"
"net"
"net/http"
_ "net/http/pprof"
"time"
)
func init() {
go func() {
http.ListenAndServe("127.0.0.1:6060", nil)
}()
// backend
go func() {
http.ListenAndServe("127.0.0.1:6061", nil)
}()
}
func main() {
l, err := net.Listen("tcp", "127.0.0.1:3000")
if err != nil {
panic(err)
}
for {
c, err := l.Accept()
if err != nil {
panic(err)
}
r := make([]byte, 50)
for {
time.Sleep(50 * time.Millisecond)
n, err := c.Read(r)
log.Println(n, err)
}
}
}
client.go
package main
import (
"net"
"time"
)
func main() {
c, err := net.Dial("tcp", "127.0.0.1:3000")
if err != nil {
panic(err)
}
for {
time.Sleep(time.Millisecond)
c.Write([]byte{'c'})
}
}
And excute these command:
$ go run server.go $ go run client.go $ curl http://127.0.0.1:6060/debug/pprof/trace?seconds=5 -o trace.data $ go tool trace trace.data
What did you expect to see?
In trace view, the event "proc start" and "proc stop" should appear every 50 ms because of time.Sleep(50 * time.Millisecond)
.
What did you see instead?
The event "proc start" and "proc stop" appears every 1 ms because of client sends data every 1 ms.
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Triage Backlog