go性能分析工具pprof的用途及使用详解

package main

import (
    "flag"
    "fmt"
    "log"
    "os"
    "runtime/pprof"
)

//执行 go run main -help 查看帮助信息
//执行 go run main -cpuprofile cpu.prof 生成cpu性能分析文件
func main() {
    var cpuprofile = flag.String("cpuprofile", "", "请输入 -cpuprofile 指定cpu性能分析文件名称")
    //在所有flag都注册之后，调用：flag.Parse()
    flag.Parse()
    f, err := os.Create(*cpuprofile)
    if err != nil {
        log.Fatal("could not create CPU profile: ", err)
    }
    // StartCPUProfile为当前进程开启CPU profile。
    if err := pprof.StartCPUProfile(f); err != nil {
        log.Fatal("could not start CPU profile: ", err)
    }
    // StopCPUProfile会停止当前的CPU profile（如果有）
    defer pprof.StopCPUProfile()

    sum := 0
    for i := 0; i < 100; i++ {
        sum += i
    }
    fmt.Printf("sum=%d\n", sum)
}

go run main.go -cpuprofile cpu.prof

go tool pprof cpu.prof

package main

import (
    "flag"
    "fmt"
    "log"
    "os"
    "runtime"
    "runtime/pprof"
)

//执行 go run main -help 查看帮助信息
//执行 go run main -menprofile men.prof 生成内存性能分析文件
func main() {
    var menprofile = flag.String("menprofile", "", "请输入 -menprofile 指定内存性能分析文件名称")
    //在所有flag都注册之后，调用：flag.Parse()
    flag.Parse()
    f, err := os.Create(*menprofile)
    if err != nil {
        log.Fatal("could not create memory profile: ", err)
    }
    defer f.Close() // error handling omitted for example
    runtime.GC()    // get up-to-date statistics
    if err := pprof.WriteHeapProfile(f); err != nil {
        log.Fatal("could not write memory profile: ", err)
    }
    sum := 0
    for i := 0; i < 100; i++ {
        sum += i
    }
    fmt.Printf("sum=%d\n", sum)
}

package main

import (
    "fmt"
    "gin_pro/pkg/setting"
    "gin_pro/routers"
    "net/http"
    _ "net/http/pprof"
)

func main() {
    //用于pprof检测内存使用情况
    go func() {
        http.ListenAndServe("0.0.0.0:8080", nil)
    }()

    router := routers.InitRouter()

    s := &http.Server{
        Addr:           fmt.Sprintf(":%d", setting.HTTPPort),
        Handler:        router,
        ReadTimeout:    setting.ReadTimeout,
        WriteTimeout:   setting.WriteTimeout,
        MaxHeaderBytes: 1 << 20, // 1* 2^20 = 1*1024*1024 = 1M
    }
    s.ListenAndServe()
}

#所有过去内存分配的采样
go tool pprof http://127.0.0.1:8080/debug/pprof/allocs

#对活动对象的内存分配进行采样（活动）
go tool pprof http://127.0.0.1:8080/debug/pprof/heap

# 下载 cpu profile，默认从当前开始收集 30s 的 cpu 使用情况，需要等待 30s
go tool pprof http://127.0.0.1:8080/debug/pprof/profile
# wait 120s
go tool pprof http://127.0.0.1:8080/debug/pprof/profile?seconds=120    

#导致同步原语阻塞的堆栈跟踪
go tool pprof http://127.0.0.1:8080/debug/pprof/block

#所有当前goroutine的堆栈跟踪
go tool pprof http://127.0.0.1:8080/debug/pprof/goroutine

#争用互斥锁持有者的堆栈跟踪
go tool pprof http://127.0.0.1:8080/debug/pprof/mutex

#当前程序的执行轨迹。
go tool pprof http://127.0.0.1:8080/debug/pprof/trace