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profile: How to profile a go program base on wall time instead of cpu time? #28203

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ppggff opened this issue Oct 15, 2018 · 2 comments
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profile: How to profile a go program base on wall time instead of cpu time? #28203

ppggff opened this issue Oct 15, 2018 · 2 comments
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@ppggff
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ppggff commented Oct 15, 2018

As I know, go profile use SIGPROF to sample call stacks N times per second in cpu time.
It will ignore idle time, waiting time since these time doesn't consume cpu.

To profile a go program with mix load, I want to profile it base on wall time: samples
call stacks N times per second in wall time. And it will show the result in same UI of cpu time.

For example, poor man's profiler (https://poormansprofiler.org/) sampling program by running gdb per second(or minute).

How to do it with current go prof? or some others tools?
@ianlancetaylor
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I don't think there is a way.

Note that we don't use the issue tracker for questions. See https://golang.org/wiki/Questions . I'm going to close this issue report because there is no clear way to fix it.

@ppggff
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ppggff commented Oct 15, 2018 •
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Thanks. I created a topic at Go Forum: https://forum.golangbridge.org/t/profile-how-to-profile-a-go-program-base-on-wall-time-instead-of-cpu-time/10990

And I am trying to make it work by:

  • Set cpu sample rate to 1Hz
  • Start a time ticker (100Hz) to send SIGPROF to self

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@ppggff @ianlancetaylor @gopherbot