GO性能追踪trace+pprof

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package main

import (
	"fmt"
	"os"
	"path/filepath"
	"runtime"
	"runtime/trace"
	"sync"
)

func FbnqDp(n int) (s int) {
	dp := make([]int, n+1)
	dp[1] = 1

	for i := 2; i < n+1; i++ {
		dp[i] = dp[i-2] + dp[i-1]
	}

	return dp[n]
}

func Fbnq(n int) (s int) {
	if n <= 2 {
		return 1
	}
	return Fbnq(n-1) + Fbnq(n-2)
}

func main() {
	runtime.GOMAXPROCS(1)
	dir, err := os.Getwd()
	if err != nil {
		fmt.Println("获取目录路径失败!")
	}

	fileName := filepath.Join(dir, "test.pprof")
	f, _ := os.Create(fileName)
	trace.Start(f)
	defer trace.Stop()

	wg := sync.WaitGroup{}
	wg.Add(2)
	go func() {
		defer wg.Done()
		fmt.Println(Fbnq(40))
	}()

	go func() {
		defer wg.Done()
		fmt.Println(FbnqDp(40))
	}()
	wg.Wait()
}

1

go run main.go

1

go tool trace test.pprof

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package main

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

func FbnqDp(n int) (s int) {
	dp := make([]int, n+1)
	dp[1] = 1

	for i := 2; i < n+1; i++ {
		dp[i] = dp[i-2] + dp[i-1]
	}

	return dp[n]
}

func Fbnq(n int) (s int) {
	if n <= 2 {
		return 1
	}
	return Fbnq(n-1) + Fbnq(n-2)
}

func main() {
	go func() {
		if err := http.ListenAndServe(":6060", nil); err != nil {
			log.Fatal(err)
		}
		os.Exit(0)
	}()

	http.HandleFunc("/hello", func(w http.ResponseWriter, req *http.Request) {
		w.Write([]byte("Hello World!"))
	})
	http.HandleFunc("/Fbnq", func(w http.ResponseWriter, req *http.Request) {
		fmt.Println(Fbnq(10))
	})
	http.HandleFunc("/FbnqDp", func(w http.ResponseWriter, req *http.Request) {
		fmt.Println(FbnqDp(10))
	})
	http.ListenAndServe(":8080", nil)
}

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➜  p9 go run main.go

# 20s是抓取时长，这期间的访问都会被记录到
➜  p9 curl http://127.0.0.1:6060/debug/pprof/trace\?seconds\=20 > trace.out

# 所以下面的命令需要在上面的命令执行后的20s内执行
➜  p9 curl 127.0.0.1:8080/hello 
Hello World!%                                 
➜  p9 curl 127.0.0.1:8080/Fbnq  
➜  p9 curl 127.0.0.1:8080/FbnqDp

➜  p9 go tool trace trace.out