golang[84]-http/pprof

pprof的使用

import _ "net/http/pprof"

如果没有htpp服务器，则需要开一个goroutine 开启http

go func() {
log.Println(http.ListenAndServe(“localhost:6060”, nil))
}()

如果你本身就是一个http服务器，要注意直接添加可能没效果，因为其使用了默认的mux。

httprouter的使用办法：

Route{"pprof", "GET", "/debug/*name", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
  http.DefaultServeMux.ServeHTTP(writer,request)
} },

If you’re using a github.com/gorilla/mux.Router you can simply hand off any request prefixed with /debug/ to the http.DefaultServeMux.

import _ "net/http/debug"
router := mux.NewRouter()
router.PathPrefix("/debug/").Handler(http.DefaultServeMux)

or

func init() {
        http.Handle("/debug/pprof/", http.HandlerFunc(Index))
        http.Handle("/debug/pprof/cmdline", http.HandlerFunc(Cmdline))
        http.Handle("/debug/pprof/profile", http.HandlerFunc(Profile))
        http.Handle("/debug/pprof/symbol", http.HandlerFunc(Symbol))
        http.Handle("/debug/pprof/trace", http.HandlerFunc(Trace))
}

使用方式

go tool pprof http://localhost:6060/debug/pprof/goroutine
go tool pprof http://localhost:6060/debug/pprof/heap
go tool pprof http://localhost:6060/debug/pprof/threadcreate
go tool pprof http://localhost:6060/debug/pprof/block
go tool pprof http://localhost:6060/debug/pprof/mutex

会进入命令面板
常用的有top

查看cup：
go tool pprof ./hyperkube http://192.168.1.7:9970/debug/pprof/profile

heap

– inuse_space: Means pprof is showing the amount of memory allocated
and not yet released.
– inuse_objects: Means pprof is showing the amount of objects allocated
and not yet released.
– alloc_space: Means pprof is showing the amount of memory allocated,
regardless if it was released or not.
– alloc_objects: Means pprof is showing the amount of objects allocated,
– flat: Represents the memory allocated by a function and still held by that
function.
– cum: Represents the memory allocated by a function or any other function
that is called down the stack.

trace

注意下面的代码对于cgo不支持
curl http://127.0.0.1:6060/debug/pprof/trace?seconds=20 > trace.out
go tool trace trace.out

如果吧下面的代码写入main函数中，会生成trace文件，但是注意，必须要程序停止后才能执行trace.out

package main

import (
	"os"
	"runtime/trace"
)

func main() {
  //trace
  	go func() {
  		f, err := os.Create("trace.out")
  		if err != nil {
  			panic(err)
  		}
  		err = trace.Start(f)
  		if err != nil {
  			panic(err)
  		}
  		defer func() {
  			trace.Stop()
  			panic(f.Close())
  		}()
  		ch := make(chan os.Signal, 1)
  		//系统退出信号
  		signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGQUIT)
  		select {
  		case <-ch:
  			return
  		}
  	}()
  }