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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