Re: hwpmc & sampling

From: Niklas Sorensson (nik_at_cs.chalmers.se)
Date: 09/28/05

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    Date: Wed, 28 Sep 2005 16:11:29 +0200 (CEST)
To: "Joseph Koshy" <joseph.koshy@gmail.com>

    > Niklas,
    >
    > ns> time pmcstat -P instructions -O samples.out ./minisat_static
    >
    > ns> I would expect quite a lot more samples for a program that
    > ns> runs for more than 20 seconds. Am I doing something wrong,
    >
    > Could you check whether the output of "pmccontrol -s", shows the
    > 'interrupts dropped due to lack of space' count as non-zero?

    This does not seem to be the case.

     nik> pmcstat -P instructions -O samples.out ./minisat_static [..]

     nik> ll samples.out
     -rw-r--r-- 1 nik users 744 28 Sep 15:54 samples.out

     nik> pmcstat -R samples.out | grep sample | wc -l
           20

     nik> pmccontrol -s
     interrupts processed: 20
     non-PMC interrupts: 0
     interrupts dropped due to lack of space: 0
     system calls: 16
     system calls with errors: 0
     buffer requests: 2
     buffer requests failed: 0
     sampling log sweeps: 5

    Seems wierd huh? I'd love to get this to work and would'nt mind
    investigating the issue if you point me in the right direction.
    I attached output of dmesg and my kernel configuration, let me
    know if there is any other information that would be helpful.

    /Niklas

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