[golang]pprof性能分析工具

来源：互联网发布：属于网络教育的特征是编辑：程序博客网时间：2024/05/24 05:32

1. 关于pprof

pprof是golang程序一个性能分析的工具，可以查看堆栈、cpu信息等。

2. 源码示例

package mainimport (    "flag"    "log"    "net/http"    _ "net/http/pprof"    "sync"    "time")func Counter(wg *sync.WaitGroup) {    time.Sleep(time.Second)    var counter int    for i := 0; i < 1000000; i++ {        time.Sleep(time.Millisecond * 200)        counter++    }    wg.Done()}func main() {    flag.Parse()    //远程获取pprof数据    go func() {        log.Println(http.ListenAndServe("localhost:8080", nil))    }()    var wg sync.WaitGroup    wg.Add(10)    for i := 0; i < 10; i++ {        go Counter(&wg)    }    wg.Wait()    // sleep 10mins, 在程序退出之前可以查看性能参数.    time.Sleep(60 * time.Second)}

3. 编译运行

go run test_pprof.go

4. 通过网页查看overview

golang pprof

5. 通过终端命令查看各参数

查看堆栈信息

root@XIAOMO:~# go tool pprof http://localhost:8080/debug/pprof/heapFetching profile from http://localhost:8080/debug/pprof/heapSaved profile in /root/pprof/pprof.localhost:8080.inuse_objects.inuse_space.003.pb.gzEntering interactive mode (type "help" for commands)(pprof) top101069.45kB of 1069.45kB total (  100%)Showing top 10 nodes out of 11 (cum >= 512.19kB)      flat  flat%   sum%        cum   cum%  557.26kB 52.11% 52.11%   557.26kB 52.11%  html.init  512.19kB 47.89%   100%   512.19kB 47.89%  runtime.malg         0     0%   100%   557.26kB 52.11%  html/template.init         0     0%   100%   557.26kB 52.11%  main.init         0     0%   100%   557.26kB 52.11%  net/http/pprof.init         0     0%   100%   557.26kB 52.11%  runtime.goexit         0     0%   100%   557.26kB 52.11%  runtime.main         0     0%   100%   512.19kB 47.89%  runtime.mcommoninit         0     0%   100%   512.19kB 47.89%  runtime.mpreinit         0     0%   100%   512.19kB 47.89%  runtime.rt0_go(pprof) web

top10命令查看了堆栈空间最大的10个函数调用;
web明令则生成了很详细的图, 如下:
golang pprof

查看cpu性能信息

root@xiaomo:~$ go tool pprof http://localhost:8080/debug/pprof/profileFetching profile from http://localhost:8080/debug/pprof/profilePlease wait... (30s)Saved profile in /home/xiaomo/pprof/pprof.pprof.localhost:8080.samples.cpu.001.pb.gzEntering interactive mode (type "help" for commands)(pprof) web

输入命令web后生成详细结果，如下图所示:
pprof_cpu

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