Messages in this thread | | | Date | Thu, 23 Feb 2012 17:17:09 +0100 | From | Ingo Molnar <> | Subject | Re: sched: Avoid SMT siblings in select_idle_sibling() if possible |
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* Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> wrote:
> * Ingo Molnar <mingo@elte.hu> [2012-02-23 12:26:50]: > > > pro perf tip of the day: did you know that it's possible to run: > > > > perf stat --repeat 10 --null perf bench sched pipe > > Ah yes ..had forgotten that! What is the recommended # of > iterations to run?
Well, I start at 3 or 5 and sometimes increase it to get a meaningful stddev - i.e. one that is smaller than half of the measured effect. (for cases where I expect an improvement and want to measure it.)
Thanks,
Ingo
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