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服务性能分析

ghttp包提供了非常强大和简便的服务性能分析功能,内部完美集成了pprof性能分析工具,可以在任何时候通过EnablePprof方法启用性能分析特性,并可自定义性能分析工具页面路由地址,不传递路由地址时,默认URI地址为/debug/pprof

我们来看一个简单的例子:

package main

import (
    "gitee.com/johng/gf/g/net/ghttp"
)

func main() {
    s := ghttp.GetServer()
    s.EnablePprof()
    s.BindHandler("/", func(r *ghttp.Request){
        r.Response.Writeln("哈喽世界!")
    })
    s.SetPort(8199)
    s.Run()
}

这个例子使用了s.EnablePprof()启用了性能分析,默认会自动注册以下几个路由规则:

/debug/pprof/*action
/debug/pprof/cmdline
/debug/pprof/profile
/debug/pprof/symbol
/debug/pprof/trace

其中/debug/pprof/*action为页面访问的路由,其他几个地址为go tool pprof命令准备的。简单的性能分析我们直接访问/debug/pprof地址即可,内容如下: 1. pprof页面 1. 堆使用量 1. 当前进程中的goroutine详情

如果想要进行详细的性能分析,基本上离不开go tool pprof命令行工具的支持,在开启性能分析支持后,我们可以使用以下命令执行性能采集分析:

go tool pprof "http://127.0.0.1:8199/debug/pprof/profile"

执行后pprof工具经过约30秒左右的接口信息采集(这30秒期间Web Server应当有流量进入,我们这里不停地访问hello world页面以作测试),然后生成性能分析报告,随后可以通过top10/web等pprof命令查看报告结果,更多命令可使用go tool pprof查看。关于pprof的详细使用介绍,请查看golang官方:blog.golang.org/profiling-go-programs

本示例中的命令行性能分析结果如下:

john@johnhome:~/Workspace/Go/gf$ go tool pprof "http://127.0.0.1:8199/debug/pprof/profile"
Fetching profile over HTTP from http://127.0.0.1:8199/debug/pprof/profile
Saved profile in /home/john/pprof/pprof.___go_build_pprof_go.samples.cpu.001.pb.gz
File: ___go_build_pprof_go
Type: cpu
Time: Apr 17, 2018 at 10:53pm (CST)
Duration: 30s, Total samples = 80ms ( 0.27%)
Entering interactive mode (type "help" for commands, "o" for options)
(pprof) top10
Showing nodes accounting for 80ms, 100% of 80ms total
Showing top 10 nodes out of 49
      flat  flat%   sum%        cum   cum%
      10ms 12.50% 12.50%       10ms 12.50%  gitee.com/johng/gf/g/net/ghttp.(*Cookie).Get /home/john/Workspace/Go/GOPATH/src/gitee.com/johng/gf/g/net/ghttp/http_server_cookie.go
      10ms 12.50% 25.00%       10ms 12.50%  internal/poll.runtime_pollReset /home/john/Softs/go1.9.2/src/runtime/netpoll.go
      10ms 12.50% 37.50%       10ms 12.50%  runtime.futex /home/john/Softs/go1.9.2/src/runtime/sys_linux_amd64.s
      10ms 12.50% 50.00%       10ms 12.50%  runtime.getitab /home/john/Softs/go1.9.2/src/runtime/iface.go
      10ms 12.50% 62.50%       10ms 12.50%  runtime.newarray /home/john/Softs/go1.9.2/src/runtime/slice.go
      10ms 12.50% 75.00%       10ms 12.50%  runtime.rawstringtmp /home/john/Softs/go1.9.2/src/runtime/string.go
      10ms 12.50% 87.50%       10ms 12.50%  runtime.usleep /home/john/Softs/go1.9.2/src/runtime/sys_linux_amd64.s
      10ms 12.50%   100%       10ms 12.50%  sync.(*RWMutex).Lock /home/john/Softs/go1.9.2/src/sync/rwmutex.go
         0     0%   100%       10ms 12.50%  bufio.(*Writer).Flush /home/john/Softs/go1.9.2/src/bufio/bufio.go
         0     0%   100%       10ms 12.50%  gitee.com/johng/gf/g/container/gqueue.(*Queue).PopFront /home/john/Workspace/Go/GOPATH/src/gitee.com/johng/gf/g/container/gqueue/gqueue.go
(pprof) web
Failed to execute dot. Is Graphviz installed? Error: exec: "dot": executable file not found in $PATH
(pprof) web
(pprof)

其中web命令用以图形展示接口之间的调用关系以及性能情况,但是需要安装Graphviz图形化工具,以我目前的系统为ubuntu为例,直接执行sudo apt-get install graphviz命令即可安装完成图形化工具,随后再次使用web命令,最终生成以下图表: