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    SubjectRe: Inconsistent timing results of multithreaded program on an SMP machine.
    Date
    On Thu, 24 Nov 2005 19:33, Marcel Zalmanovici wrote:
    > Hi Con,
    >
    > I've tried the pthread_join theory.
    > pthread_join completes very fast, no evidence on it being the perpetrator
    > here.
    >
    > I've ran your ps -... idea in a different term window every ms while the
    > test was running. It created a large file so I won't mail it to you, but
    > both me and Muli observed that once the thread ends it quickly disappears
    > from the ps list.
    >
    > I've also ran Muli's idea and added gettimeofday calls.
    > Here's the altered code and output:
    >
    > (See attached file: idle.log)(See attached file: sched_test.c)
    >
    > As you can see, if a thread already finished pthread_join returns in a
    > split second.
    >
    > Any other ideas are welcome :-)

    Profile the actual application?

    > P.S. - I agree that Lotus isn't ideal for this kind of conversations, but
    > that's what IBM is using.

    It was tongue in cheek ;) Well that should still not stop you from replying
    below the original thread.

    Cheers,
    Con
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