51.Golang FlameGraph（火焰图）

1.安装组件

1. 安装go-torch
   go get github.com/uber/go-torch
2. 安装 FlameGraph
   cd $WORK_PATH && git clone https://gitee.com/mirrors/FlameGraph.git
export PATH=$PATH:$WORK_PATH/FlameGraph
3. 安装graphviz
   yum install graphviz(CentOS, Redhat)

2.代码修改

package main

import (
    "net/http"
    "net/http/pprof"
)

func main() {
    // 主函数中添加
    go func() {
        http.HandleFunc("/debug/pprof/block", pprof.Index)
        http.HandleFunc("/debug/pprof/goroutine", pprof.Index)
        http.HandleFunc("/debug/pprof/heap", pprof.Index)
        http.HandleFunc("/debug/pprof/threadcreate", pprof.Index)

        http.ListenAndServe("0.0.0.0:8888", nil)
    }()

    var finishWaiter chan int
    <-finishWaiter
}

3.查看结果

运行上述程序后，使用如下命令生成ＣＰＵ火焰图：
go-torch -u http://localhost:8888/debug/pprof/ -p > profile-local.svg

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