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viraptor
Asked: 2009-07-10 02:50:12 +0800 CST

Getting a per thread cpu stats

  • 772

I'm interested in the current usage of cpu - precisely cpu% and wait% - for each thread in a specific application. Is it possible to get that information from somewhere?

I know that top can split information per real thread (ones with pid), but it doesn't show the system/user/wait cpu usage split for each of them. I would also like some way to log that info. Do you know any apps (or apis) that can do that?

linux threads

7 Answers

  1. top -H -p pid

    hope it can help

    • 21

  2. Percent of cpu usage per thread you can get with ps command:

     ps -emo %cpu,pid,user,args

    The way it is calculated is described in ps manpage:

    Currently, it is the CPU time used divided by the time the process has been running (cputime/realtime ratio), expressed as a percentage.

    • 13
  3. Best Answer

    I'd look into SystemTap. This tool will certainly give you what you want. There is this example of profiling threads; don't know if it has all you want, but you could modify it so that it does.

    • 5

  4. Maybe have a look at htop, you can configure quite a lot with it.

    • 0

  5. Did you tried sar? It can fetch a lot of information even on pid level.

    • 0

  6. Nagios and PNP http://docs.pnp4nagios.org/pnp-0.4/start

    Works awesome... little configuration.

    • 0

  7. I have stumbled on this on a embedded system where we don't have the fancy tools to look in to this stuff.

    For this, I have used cpuacct cgroup and placed each thread into its own folder. This way I was able to measure their usage.

    Hierarchy was looking like this:

    my-app.service
|-tid1
|-tid2
|-tid3

    Then I changed it to

    my-app.service
|-dir1
|  -tid1
|-dir2
|  -tid2
|-dir3
|  -tid3
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