pprof（用于golang）不显示我的包的详细信息。

huangapple
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英文:

pprof (for golang) doesn't show details for my package

问题

我一直在尝试使用pprof对我的Go应用程序（evm-specification-miner）进行性能分析，但输出结果并不是很有用：

  1. (pprof) top5
  2. 108.59mins of 109.29mins total (99.36%)
  3. Dropped 607 nodes (cum <= 0.55mins)
  4. Showing top 5 nodes out of 103 (cum >= 0.98mins)
  5.       flat  flat%   sum%        cum   cum%
  6.   107.83mins 98.66% 98.66% 108.64mins 99.40%  [evm-specification-miner]
  7.   0.36mins  0.33% 98.99%      6mins  5.49%  net.dialIP
  8.   0.30mins  0.28% 99.27%   4.18mins  3.83%  net.listenIP
  9.   0.06mins 0.052% 99.32%  34.66mins 31.71%  
  10. github.com/urfave/cli.BoolFlag.ApplyWithError
  11.   0.04mins 0.036% 99.36%   0.98mins   0.9%  net.probeIPv6Stack

这是累积输出结果：

  1. (pprof) top5 --cum
  2. 1.80hrs of 1.82hrs total (98.66%)
  3. Dropped 607 nodes (cum <= 0.01hrs)
  4. Showing top 5 nodes out of 103 (cum >= 1.53hrs)
  5.       flat  flat%   sum%        cum   cum%
  6.    1.80hrs 98.66% 98.66%    1.81hrs 99.40%  [evm-specification-miner]
  7.          0     0% 98.66%    1.53hrs 83.93%  net.IP.matchAddrFamily
  8.          0     0% 98.66%    1.53hrs 83.92%  net.(*UDPConn).WriteToUDP
  9.          0     0% 98.66%    1.53hrs 83.90%  net.sockaddrToUDP
  10.          0     0% 98.66%    1.53hrs 83.89%  net.(*UDPConn).readMsg

如你所见，大部分时间都花在了evm-specification-miner（我的Go应用程序名称）上，但我无法获得更多细节，甚至不理解这些方括号代表什么（有一个类似问题的问题，但没有得到答案）。

以下是构建和pprof命令：

  1. go install evm-specification-miner
  2. go tool pprof evm-specification-miner cpuprof

我甚至尝试了调试标志-gcflags "-N -l"（如此处所述：https://golang.org/doc/gdb#Introduction），但没有成功。

性能分析是通过调用pprof.StartCPUProfile()和pprof.StopCPUProfile()来完成的，如此博客文章所述：https://blog.golang.org/profiling-go-programs：

  1. func StartProfiling(cpuprof string) error {
  2.     f, err := os.Create(cpuprof)
  3.     if err != nil {
  4.         return err
  5.     }
  6.     return pprof.StartCPUProfile(f)
  7. }
  9. func StopProfiling() error {
  10.     pprof.StopCPUProfile()
  11.     return nil
  12. }

StartProfiling在main()的开头调用，而StopProfiling在接收到信号（中断或终止）时调用（或者程序正常终止）。此分析是在中断后获得的。

英文:

I've been trying to profile my go application (evm-specification-miner) with pprof, but the output is not really useful:

  1. (pprof) top5
  2. 108.59mins of 109.29mins total (99.36%)
  3. Dropped 607 nodes (cum <= 0.55mins)
  4. Showing top 5 nodes out of 103 (cum >= 0.98mins)
  5.       flat  flat%   sum%        cum   cum%
  6.   107.83mins 98.66% 98.66% 108.64mins 99.40%  [evm-specification-miner]
  7.   0.36mins  0.33% 98.99%      6mins  5.49%  net.dialIP
  8.   0.30mins  0.28% 99.27%   4.18mins  3.83%  net.listenIP
  9.   0.06mins 0.052% 99.32%  34.66mins 31.71%  
  10. github.com/urfave/cli.BoolFlag.ApplyWithError
  11.   0.04mins 0.036% 99.36%   0.98mins   0.9%  net.probeIPv6Stack

And here is the cumulative output:

  1. (pprof) top5 --cum
  2. 1.80hrs of 1.82hrs total (98.66%)
  3. Dropped 607 nodes (cum <= 0.01hrs)
  4. Showing top 5 nodes out of 103 (cum >= 1.53hrs)
  5.       flat  flat%   sum%        cum   cum%
  6.    1.80hrs 98.66% 98.66%    1.81hrs 99.40%  [evm-specification-miner]
  7.          0     0% 98.66%    1.53hrs 83.93%  net.IP.matchAddrFamily
  8.          0     0% 98.66%    1.53hrs 83.92%  net.(*UDPConn).WriteToUDP
  9.          0     0% 98.66%    1.53hrs 83.90%  net.sockaddrToUDP
  10.          0     0% 98.66%    1.53hrs 83.89%  net.(*UDPConn).readMsg

As you can see, most of the time is spent in evm-specification-miner (which is the name of my go application), but I've been unable to obtain more details or even understand what these square brackets meant (there is a question with a similar problem, but it didn't receive any answer).

Here are the build and pprof commands:

  1. go install evm-specification-miner
  2. go tool pprof evm-specification-miner cpuprof

I've even tried the debug flags -gcflags "-N -l" (as noted here: https://golang.org/doc/gdb#Introduction), to no avail.

The profiling is done with calls to pprof.StartCPUProfile() and pprof.StopCPUProfile() as is explained by this blog post: https://blog.golang.org/profiling-go-programs:

  1. func StartProfiling(cpuprof string) error {
  2. 	f, err := os.Create(cpuprof)
  3. 	if err != nil {
  4. 		return err
  5. 	}
  6. 	return pprof.StartCPUProfile(f)
  7. }
  9. func StopProfiling() error {
  10.     pprof.StopCPUProfile()
  11.     return nil
  12. }

StartProfiling is called at the beginning of main(), and StopProfiling when a signal (interrupt or kill) is received (or if the program terminates normally). This profile was obtained after an interruption.

答案1

得分: 0

看起来更新到1.9rc1修复了它。

我的配置文件中不再有[evm-specifiation-miner]（记录一下，顶部的函数甚至不是来自我的包，所以它们之前没有出现甚至更奇怪）。

英文:

Looks like updating to 1.9rc1 fixed it.

I no longer have [evm-specifiation-miner] in the profile (for the record, the top functions do not even come from my own package, so it is even weirder than they did not appear before).

huangapple
  • 本文由 发表于 2017年7月26日 00:36:44
  • 转载请务必保留本文链接：https://go.coder-hub.com/45309074.html
  • go
  • pprof
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