This issue may be of interest to you:
https://github.com/golang/go/issues/10958
On Tuesday, September 20, 2016 at 7:42:24 PM UTC-7, Tony Chen wrote:
>
> ### What version of Go are you using (`go version`)?
> go 1.6.2 mac/amd64
>
> ### What operating system and processor architecture are you using (`go
> env`)?
> GOARCH="amd64"
> GOBIN=""
> GOEXE=""
> GOHOSTARCH="amd64"
> GOHOSTOS="darwin"
> GOOS="darwin"
> GOPATH="/data/apps/go"
> GORACE=""
> GOROOT="/usr/local/go"
> GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
> GO15VENDOREXPERIMENT="1"
> CC="clang"
> GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments
> -fmessage-length=0 -fno-common"
> CXX="clang++"
> CGO_ENABLED="1"
>
> ### What did you do?
>
> package main
>
> import (
> "net/http"
> "strconv"
> "fmt"
> )
>
> func main() {
> http.HandleFunc("/", httpHandler)
> http.ListenAndServe(":8001", nil)
> }
>
> func httpHandler(w http.ResponseWriter, r *http.Request) {
> b, _ := strconv.ParseBool(r.URL.Query().Get("loop"))
> if b {
> loop()
> }
> fmt.Fprintf(w, "ok")
> }
>
> func loop() {
> i := 0
> for {
> if i == 10000 {
> i = 0
> }
> i++
> }
> }
> 1. curl http://127.0.0.1:8001/?loop=true
> 2. curl http://127.0.0.1:8001/?loop=false
> When the loop to the CPU processing and about 8 times the request, refused
> to all the HTTP request.
> ### What did you expect to see?
>
> export GODEBUG=schedtrace=1000
> SCHED 1010ms: gomaxprocs=8 idleprocs=8 threads=6 spinningthreads=0
> idlethreads=3 runqueue=0 [0 0 0 0 0 0 0 0]
> SCHED 2016ms: gomaxprocs=8 idleprocs=8 threads=6 spinningthreads=0
> idlethreads=3 runqueue=0 [0 0 0 0 0 0 0 0]
> SCHED 3019ms: gomaxprocs=8 idleprocs=8 threads=6 spinningthreads=0
> idlethreads=3 runqueue=0 [0 0 0 0 0 0 0 0]
> SCHED 4028ms: gomaxprocs=8 idleprocs=7 threads=6 spinningthreads=0
> idlethreads=2 runqueue=0 [0 0 0 0 0 0 0 0]
> SCHED 5033ms: gomaxprocs=8 idleprocs=5 threads=6 spinningthreads=0
> idlethreads=0 runqueue=0 [0 0 0 0 0 0 0 0]
> SCHED 6033ms: gomaxprocs=8 idleprocs=3 threads=8 spinningthreads=0
> idlethreads=0 runqueue=0 [0 0 0 0 0 0 0 0]
> SCHED 7035ms: gomaxprocs=8 idleprocs=0 threads=10 spinningthreads=0
> idlethreads=0 runqueue=0 [0 0 0 0 0 0 0 0]
> SCHED 8037ms: gomaxprocs=8 idleprocs=0 threads=10 spinningthreads=0
> idlethreads=0 runqueue=1 [0 0 0 0 0 0 0 0]
> SCHED 9044ms: gomaxprocs=8 idleprocs=0 threads=10 spinningthreads=0
> idlethreads=0 runqueue=1 [0 0 0 0 0 0 0 0]
> SCHED 10050ms: gomaxprocs=8 idleprocs=0 threads=10 spinningthreads=0
> idlethreads=0 runqueue=1 [0 0 0 0 0 0 0 0]
> SCHED 11059ms: gomaxprocs=8 idleprocs=0 threads=10 spinningthreads=0
> idlethreads=0 runqueue=1 [0 0 0 0 0 0 0 0]
> SCHED 12060ms: gomaxprocs=8 idleprocs=0 threads=10 spinningthreads=0
> idlethreads=0 runqueue=1 [0 0 0 0 0 0 0 0]
>
>
>
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