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Analyzing Linux Performance Issues With Perf

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  • Analyzing Linux Performance Issues With Perf

    Phoronix: Analyzing Linux Performance Issues With Perf

    If you have never made use of Linux's perf subsystem, it can provide some valuable insight to what is slowing down your game/application...

    http://www.phoronix.com/scan.php?pag...f-Collab-Guide

  • #2
    Another good feature of "perf" is that since it uses kernel facilities to "see" the whole program-execution, it can tell you about things like systems-library usage that don't show up with user-level tools like "prof".

    As an example, running the EPA's (numerical supercomputing) air quality model CMAQ for the standard 15KM test case with "perf" showed that this model spent 29.8% of its time in Fortran run-time-library string manipulation. (Remember, this is supposed to be a numerical, not a text, application!!.

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    • #3
      If you want to dig deeper into all of what perf can do, there is a fantastic guide here: http://www.brendangregg.com/perf.html

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      • #4
        Originally posted by coats View Post
        As an example, running the EPA's (numerical supercomputing) air quality model CMAQ for the standard 15KM test case with "perf" showed that this model spent 29.8% of its time in Fortran run-time-library string manipulation. (Remember, this is supposed to be a numerical, not a text, application!!.
        This is pretty interesting. Have you (or whoever) done any further investigations?

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