[PD] pd and cpu frequency scaling

cyrille henry cyrille.henry at la-kitchen.fr
Sun Nov 2 13:13:26 CET 2008


hello,


Roman Haefeli a écrit :
> hi all
> 
> i noticed, that the cpu frequency scaling doesn't react on cpu load
> caused by pd.
this is strange.
did you try without -rt or -jack?

here it works as expected, but i always switch to performance mode anyway since frequency scaling is quite slow and can lead to audio click for a second when you switch on your patch, before the CPU frequency go to maximum.

So, i think that switching to performance mode when you need performance is not really a fix or a workaround : it's the way to go.

Cyrille


> even if i have a constant high load - for instance when
> running several hundred [osc~]s - the cpu frequency stays at the lowest
> value of 800 MHz. i need to run another program, such as 'yes' or
> 'burnMMX' in order to trigger the scaling to set the frequency to the
> maximum of 2401000 MHz. 
> so far i only noticed this behaviour with pd. other programs don't seem
> to 'fool' frequency scaling. 
> 
> specs:
> pd 0.41.4 running in -rt -jack mode
> 2.6.24-21-rt (from ubuntu hardy)
> Intel Core 2 Duo CPU T8300 @ 2.40GHz
> scaling_governor: on_demand (default)
> 
> i know, that it is most likely not a direct pd problem, but probably
> some other pd-linux users encountered a similar behaviour. as a
> workaround, i currently manually switch the scaling_governor to
> 'performance', when i am in a 'performative' situation. i wonder, if
> there is a real fix for that problem.
> 
> roman
> 
> 
> 
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