[PD] how to optimize system for pd performance?

[cyrille henry]

Roman Haefeli a écrit :
> you might have guessed it, but for the sake of correctness:
> 
> this is:
> - linux / ubuntu hardy
> - intel core 2 duo (800 -> 2401 MHz)
> - pd vanilla 0.42 test5
you're using pd test version for your performance?

i've got problem loading my old patch with this version.
is it really stable?


cyrille

> 
> 
> On Sun, 2008-12-07 at 16:58 +0100, Roman Haefeli wrote:
>> hi all
>>
>> i encountered, that 'ondemand' cpu scaling doesn't work correctly when
>> running pd with realtime priority. even if pd is using 80% or more
>> resources (of one core), the cpu frequency is not raised and staying at
>> 800MHz. i can force it to go up by running an instance of 'burnMMX' (or
>> something else, that burns as many cycles as possible). when running pd
>> with '-nrt', automatic scaling works fine. also, as a workaround, i can
>> set the scaling_governor to 'userspace' and then set the cpu frequency
>> manually. 
>>
>> could it be, that when pd is running in realtime mode, its priority is
>> higher then the one of the process, that controls the cpu frequency, so
>> that cpu time is assigned rather to pd and only at times, when pd is not
>> using it, the governor can adjust the frequency (which would be the
>> loweset, since pd is not using much cpu at that time)?
>>
>> i wonder, what other people do in a performative situation? do you
>> simply turn automatic scaling off and set frequency to the highest
>> value? or is it only me having this issue?
>>
>>
>> while we are at priorities:
>> i figured out, that all four combinatios are possible:
>> pd -rt, jackd -R
>> pd -nrt, jackd -R
>> pd -rt, jackd
>> pd -nrt, jackd
>>
>> i guess, that the first one should be used for best performance, right?
>> but how to set priorities between jackd and pd? can this be fine-tuned
>> at all (i know you can fine-tune jackd) ? if so, which should have
>> higher priority? 
>>
>> roman
>>
>>
>>
>>
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