[Speed] Getting the project off the ground

Stefan Behnel stefan_ml at behnel.de
Mon Jul 11 07:59:12 CEST 2011


Daniel Stutzbach, 07.07.2011 18:55:
> On Thu, Jul 7, 2011 at 7:56 AM, Antonio Cuni wrote:
>
>> This is using the "ondemand" governor, which is the default on my
>> system. I tried to run it also with "performance", which in theory
>> should give better performance and smaller stdev, but in practice it
>> does not (I don't know why, honestly)
>
> For what it's worth, I ran some similar experiments last year and found that
> "performance" yielded much lower standard deviations for certain performance
> tests, compared to "on demand".  I no longer recall which ones
> unfortunately, but in a nutshell "on demand" is just as good only when it's
> smart enough detect that it should be using the maximum CPU frequency.
>
> Sometimes it doesn't, and the standard deviation goes up a few orders of
> magnitude.

That matches my benchmarking experience as well.

Stefan


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