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Asked: 2026-05-24T03:53:28+00:00

I couldn’t really get an answer to this question , so I’ll attempt to

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I couldn’t really get an answer to this question, so I’ll attempt to write a custom, although simple, profiler. Just to get started: suppose I need to find out, without recompiling, how much (and which) core is running my code. Suppose also I’d like to catch when a given function is executed. Finally, any thoughts about dealing with threads? Any other tips as to how to start? C is my language of choice, and I’m running Linux. Thanks.

Edit: Oprofile, CallGrind, Helgrind, gprof, papi, tau, and others I’ve analyzed seem not to match my needs.

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  1. Editorial Team

    You should try linux’s perf https://perf.wiki.kernel.org/index.php/Tutorial
    This tool has direct support from kernel and knows about page-faults, CPU-migrations, context-switches (e.g. look at perf stat output). This stats can be aggregated per-process or per-cpu. perf record can be used like oprofile.

    For adding your simple profiling you can use setitimer (the sampling signal is process-wide) or timer_create (timer signal can be installed for thread). You can’t directly get information about physical cpu number used by thread, but at every sample you can per-thread run times with getrusage with RUSAGE_THREAD.

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