pprof在http服务的使用¶
使用前准备¶
编译运行:
$ go build -o pprof_http pprof_http.go
$ ./pprof_http
模拟请求:
$ wrk -c 400 -t 8 -d 3m http://localhost:9876/test
CPU 的占用分析使用¶
打开 http://localhost:9876/debug/pprof:
$ wget http://localhost:9876/debug/pprof/profile
$ go tool pprof pprof_http profile
(pprof) top 5
Showing nodes accounting for 4.93mins, 97.46% of 5.06mins total
Dropped 180 nodes (cum <= 0.03mins)
Showing top 5 nodes out of 42
flat flat% sum% cum cum%
4.64mins 91.69% 91.69% 4.64mins 91.69% main.doSomeThingOne
0.11mins 2.16% 93.85% 0.11mins 2.16% runtime.usleep
0.09mins 1.83% 95.68% 0.09mins 1.84% runtime.newstack
0.08mins 1.52% 97.19% 0.08mins 1.52% runtime.pthread_cond_signal
0.01mins 0.27% 97.46% 0.14mins 2.68% math/rand.(*Rand).Int31n
(pprof) web // 打开本篇最后的效果图
内存快照的占用分析¶
$ wget http://localhost:9876/debug/pprof/heap
$ go tool pprof pprof_http heap
(pprof)
源码¶
package main
import (
"bytes"
"io/ioutil"
"log"
"math/rand"
"net/http"
_ "net/http/pprof"
)
func main() {
http.HandleFunc("/test", handler)
log.Fatal(http.ListenAndServe(":9876", nil))
}
func handler(w http.ResponseWriter, r *http.Request) {
err := r.ParseForm()
if nil != err {
w.Write([]byte(err.Error()))
return
}
doSomeThingOne(10000)
buff := genSomeBytes()
b, err := ioutil.ReadAll(buff)
if nil != err {
w.Write([]byte(err.Error()))
return
}
w.Write(b)
}
func doSomeThingOne(times int) {
for i := 0; i < times; i++ {
for j := 0; j < times; j++ {
}
}
}
func genSomeBytes() *bytes.Buffer {
var buff bytes.Buffer
for i := 1; i < 20000; i++ {
buff.Write([]byte{'0' + byte(rand.Intn(10))})
}
return &buff
}
效果图¶
