Re: Understanding perf mem -t load results

[Manuel Selva <selva.manuel@gmail.com>]

Thanks again.

I guess that by "how you configure perf" you are speaking about
thred/cpu, kernel/user parameters ? For now I am monitoring one
application only on a given node only and I am trying to setup things
in order to get useful results independently of the overhead. I'll
investigate overhead in a second time.

I can't use perf stat because I need to relate perf events with my
application's code.

Manu

2013/12/16 Andi Kleen <andi@firstfloor.org>:
> On Sun, Dec 15, 2013 at 11:03:13PM +0100, Manuel Selva wrote:
>> Thanks for the answer Andi.
>>
>> Is there any way (I couldn't find in the Intel documentation) to
>> have an approximation of the "maximum" acceptable frequency ?
>
> It depends on how much overhead is acceptable and how you configure
> perf (which affects the cost of the handler) and what the executed
> code does. You could tune it to minimize throttles.
>
> I would start with something like 20003
>
> If you only want the relative ratios of course using perf stat would
> be better.
>
> -Andi
>
> --
> ak@linux.intel.com -- Speaking for myself only.
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