Thread: measuring CPU usage

  1. 03-15-2017 #1
    dayalsoap
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    measuring CPU usage

    Hi all,

    Is there a way to measure CPU usage from your application's perspective? For example, I have an application that uses MPI and OpenMP that runs on a Xeon Phi. I just want to, using relatively standard Linux tools and available tools, see how much CPU usage each of the processes are using. I am figuring out how different settings will affect CPU utilizations/performance. PAPI seems a bit complicated right now given the time constraint.

    Is this the right place to ask? Should I ask in a Linux forum?

    Thanks
  2. 03-15-2017 #2
    algorism
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    Does top not give enough info?
  3. 03-15-2017 #3
    dayalsoap
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    Top is interesting but I want to collect data over the run and plot it. I'd need something in text form. Basically, top must use something that linux has from /proc, right?
  4. 03-15-2017 #4
    dayalsoap
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    I should also say, I'd like to get it on a per-core basis if that's even posssible
  5. 03-15-2017 #5
    dayalsoap
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    Something like a textual htop would be perfect haha
  6. 03-15-2017 #6
    Salem
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    Sure, there's a whole bunch of stuff underneath each /proc/<pid> directory.
    proc(5) - Linux manual page
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  7. 03-15-2017 #7
    dayalsoap
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    Anything specific out of there I should look for?
  8. 03-16-2017 #8
    Salem
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    Just go and read it.
    Or search for say "cpu" if you're that lazy.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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