Go | pprof

Go | pprof

1. 简介

Go语言性能分析工作，通过HTTP接口来分析内存、CPU占用锁冲突问题等。

2. 服务端

Go默认HTTP Server

package main

import (
	"log"
	"net/http"
	// net/http/pprof包中init方法注册路由
	_ "net/http/pprof"
)

func main() {
	log.Println(http.ListenAndServe(":6060", nil))
}

gin框架

package main

import (
	"github.com/gin-gonic/gin"
	"net/http/pprof"
)

func main() {
	r := gin.Default()
	r.GET("/debug/pprof/:name", func(c *gin.Context) {
		pprof.Index(c.Writer, c.Request)
	})
	r.GET("/debug/pprof/cmdline", func(c *gin.Context) {
		pprof.Cmdline(c.Writer, c.Request)
	})
	r.GET("/debug/pprof/profile", func(c *gin.Context) {
		pprof.Profile(c.Writer, c.Request)
	})
	r.GET("/debug/pprof/symbol", func(c *gin.Context) {
		pprof.Symbol(c.Writer, c.Request)
	})
	r.GET("/debug/pprof/trace", func(c *gin.Context) {
		pprof.Trace(c.Writer, c.Request)
	})
	r.Run(":6060") // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
}

3. 客户端

3.1. 准备

需要提前安装graphviz，下面演示macOS安装方法

macOS：

brew install graphviz

3.2. 拉取和加载信息

下面两种方法都可以

使用命令直接查看

# 分析内存占用
go tool pprof http://localhost:6060/debug/pprof/heap

# 分析CPU占用
go tool pprof http://localhost:6060/debug/pprof/profile

将信息拉取到本地在查看

# 拉取内存信息
wget -O heap.out  http://localhost:6060/debug/pprof/heap

# 加载信息（交互式命令）
go tool pprof heap.out

3.3. 查看信息

注意当前已进入go tool pprof命令交互

查看占用内存最多10个

(pprof) top 10
Showing nodes accounting for 3586.70kB, 100% of 3586.70kB total
Showing top 10 nodes out of 37
      flat  flat%   sum%        cum   cum%
  513.31kB 14.31% 14.31%   513.31kB 14.31%  regexp/syntax.(*compiler).inst (inline)
  512.56kB 14.29% 28.60%   512.56kB 14.29%  runtime.allocm
  512.50kB 14.29% 42.89%   512.50kB 14.29%  regexp.makeOnePass
  512.20kB 14.28% 57.17%   512.20kB 14.28%  runtime.malg
  512.05kB 14.28% 71.45%   512.05kB 14.28%  regexp/syntax.simplify1 (inline)
  512.05kB 14.28% 85.72%   512.05kB 14.28%  text/template/parse.(*lexer).emit
  512.02kB 14.28%   100%   512.02kB 14.28%  text/template/parse.(*Tree).newList (inline)
         0     0%   100%  1537.87kB 42.88%  github.com/go-playground/validator/v10.init
         0     0%   100%   512.02kB 14.28%  html/template.(*Template).Parse
         0     0%   100%   512.02kB 14.28%  net/rpc.init

在网页已查看图示

(pprof) web

查看更多命令

(pprof) help
输出内容太多省略

4. 参考

• pprof