Go 笔记 - http pprof

import (
    "fmt"
    "log"
    "net/http"
    _ "net/http/pprof"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprint(w, "hello world\n")
        for i := 0; i < 102400; i++ {
            s := make([]byte, 3)
            fmt.Sprint(s, "hello world\n")
          }
    })  
    log.Fatal(http.ListenAndServe("localhost:7777", nil))
}

• 通过页面访问：http://127.0.0.1:7777/debug/pprof/

  /debug/pprof/

  Types of profiles available: Count Profile 0 allocs 0 block 0 cmdline 4 goroutine 0 heap 0 mutex 0 profile 8 threadcreate 0 trace full goroutine stack dump

• 通过终端：go tool pprof http://localhost:7777/debug/pprof/profile?seconds=3

  Saved profile in /home/blue/pprof/pprof.http_pprof.samples.cpu.001.pb.gz File: http_pprof Type: cpu Time: Feb 21, 2020 at 2:07pm (CST) Duration: 3s, Total samples = 0 No samples were found with the default sample value type. Try "sample_index" command to analyze different sample values. Entering interactive mode (type "help" for commands, "o" for options)

  • 进入pprof终端，通过help查看帮助文档，对采集的数据进行分析。例如：top10 会输出cpu占用前10的函数

    Showing nodes accounting for 0, 0% of 0 total flat flat% sum% cum cum%

    flat：给定函数上运行耗时

    flat%：CPU 运行耗时总比例 sum%：给定函数累积使用 CPU 总比例 cum：当前函数加上它之上的调用运行总耗时 cum%：CPU 运行耗时总比例

  • 获取heap信息：go tool pprof http://localhost:7777/debug/pprof/heap

  • 获取block信息：go tool pprof http://localhost:6060/debug/pprof/block

  • 获取mutex信息：go tool pprof http://localhost:6060/debug/pprof/mutex

• 通过web命令：

  • 进入pprof终端：go tool pprof http://localhost:7777/debug/pprof/profile?seconds=10
  • 在pprof终端中输入：web 命令

  •