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// Copyright 2013 Beego Authors
// Copyright 2014 The Macaron Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package toolbox
import (
"bytes"
"errors"
"fmt"
"io"
"os"
"path"
"runtime"
"runtime/debug"
"runtime/pprof"
"time"
"github.com/Unknwon/com"
"gopkg.in/macaron.v1"
)
var (
profilePath string
pid int
startTime = time.Now()
inCPUProfile bool
)
// StartCPUProfile starts CPU profile monitor.
func StartCPUProfile() error {
if inCPUProfile {
return errors.New("CPU profile has alreday been started!")
}
inCPUProfile = true
os.MkdirAll(profilePath, os.ModePerm)
f, err := os.Create(path.Join(profilePath, "cpu-"+com.ToStr(pid)+".pprof"))
if err != nil {
panic("fail to record CPU profile: " + err.Error())
}
pprof.StartCPUProfile(f)
return nil
}
// StopCPUProfile stops CPU profile monitor.
func StopCPUProfile() error {
if !inCPUProfile {
return errors.New("CPU profile hasn't been started!")
}
pprof.StopCPUProfile()
inCPUProfile = false
return nil
}
func init() {
pid = os.Getpid()
}
// DumpMemProf dumps memory profile in pprof.
func DumpMemProf(w io.Writer) {
pprof.WriteHeapProfile(w)
}
func dumpMemProf() {
os.MkdirAll(profilePath, os.ModePerm)
f, err := os.Create(path.Join(profilePath, "mem-"+com.ToStr(pid)+".memprof"))
if err != nil {
panic("fail to record memory profile: " + err.Error())
}
runtime.GC()
DumpMemProf(f)
f.Close()
}
func avg(items []time.Duration) time.Duration {
var sum time.Duration
for _, item := range items {
sum += item
}
return time.Duration(int64(sum) / int64(len(items)))
}
func dumpGC(memStats *runtime.MemStats, gcstats *debug.GCStats, w io.Writer) {
if gcstats.NumGC > 0 {
lastPause := gcstats.Pause[0]
elapsed := time.Now().Sub(startTime)
overhead := float64(gcstats.PauseTotal) / float64(elapsed) * 100
allocatedRate := float64(memStats.TotalAlloc) / elapsed.Seconds()
fmt.Fprintf(w, "NumGC:%d Pause:%s Pause(Avg):%s Overhead:%3.2f%% Alloc:%s Sys:%s Alloc(Rate):%s/s Histogram:%s %s %s \n",
gcstats.NumGC,
com.ToStr(lastPause),
com.ToStr(avg(gcstats.Pause)),
overhead,
com.HumaneFileSize(memStats.Alloc),
com.HumaneFileSize(memStats.Sys),
com.HumaneFileSize(uint64(allocatedRate)),
com.ToStr(gcstats.PauseQuantiles[94]),
com.ToStr(gcstats.PauseQuantiles[98]),
com.ToStr(gcstats.PauseQuantiles[99]))
} else {
// while GC has disabled
elapsed := time.Now().Sub(startTime)
allocatedRate := float64(memStats.TotalAlloc) / elapsed.Seconds()
fmt.Fprintf(w, "Alloc:%s Sys:%s Alloc(Rate):%s/s\n",
com.HumaneFileSize(memStats.Alloc),
com.HumaneFileSize(memStats.Sys),
com.HumaneFileSize(uint64(allocatedRate)))
}
}
// DumpGCSummary dumps GC information to io.Writer
func DumpGCSummary(w io.Writer) {
memStats := &runtime.MemStats{}
runtime.ReadMemStats(memStats)
gcstats := &debug.GCStats{PauseQuantiles: make([]time.Duration, 100)}
debug.ReadGCStats(gcstats)
dumpGC(memStats, gcstats, w)
}
func handleProfile(ctx *macaron.Context) string {
switch ctx.Query("op") {
case "startcpu":
if err := StartCPUProfile(); err != nil {
return err.Error()
}
case "stopcpu":
if err := StopCPUProfile(); err != nil {
return err.Error()
}
case "mem":
dumpMemProf()
case "gc":
var buf bytes.Buffer
DumpGCSummary(&buf)
return string(buf.Bytes())
default:
return fmt.Sprintf(`<p>Available operations:</p>
<ol>
<li><a href="%[1]s?op=startcpu">Start CPU profile</a></li>
<li><a href="%[1]s?op=stopcpu">Stop CPU profile</a></li>
<li><a href="%[1]s?op=mem">Dump memory profile</a></li>
<li><a href="%[1]s?op=gc">Dump GC summary</a></li>
</ol>`, opt.ProfileURLPrefix)
}
ctx.Redirect(opt.ProfileURLPrefix)
return ""
}
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