[CentOS] measuring kernel speed

Mon May 10 14:31:56 UTC 2010
Akemi Yagi <amyagi at gmail.com>

On Mon, May 10, 2010 at 6:46 AM, Ross Walker <rswwalker at gmail.com> wrote:
> On May 10, 2010, at 8:53 AM, JohnS <jses27 at gmail.com> wrote:

>> You say efficiency loss.  That could mean anything from the power
>> input
>> down to the kernel.  It looks like that can be determined by oprofile
>> and latencytop.  Latencytop will give you the millisecond time for
>> execution. As far as Oprofile maybe Ross will indeed fill us in if he
>> can.
>
> Oprofile will show where those precious latencies timings are being
> used. It of course adds latency itself, so this should be factored
> into the latency timings.
>
> It will time all kernel operations then you can drill down into
> particular modules/routines to see more granularity.
>
> Needs debug symbols to be fully useful. Can provide timings as source
> code annotations.

I never thought someone would run oprofile with the RT kernel. I can
upload debuginfo if anyone needs it.

Akemi