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Author Topic:   Some help on DSP load
BobTheDog
Member
posted 22 May 2009 16:18         Edit/Delete Message   Reply w/Quote
Hi Guys,

I'm a little confused on this one.

How does kyma work out if it can use more than one of the dsps.

I have taken the PolyphonicPitchShiftResynth prototype and replicated it 4 times, these feed into a MultiChannelMixer.

Kyma seems to only want to use on of the dsps for this which hovers around 91% on one dsp and 27% on another. After a while the audio breaks up and all the dsps go mad, basically going between 1% and 103%, all of them can be hitting 103% at the same time. From the moment the audio breaks up it never gets itself back in order.

If you start and stop the sound it stabilises again for a while and then goes mad again.

Any ideas?

Cheers

Andy

consecutively

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bluefire
Member
posted 22 May 2009 17:53         Edit/Delete Message   Reply w/Quote
Would Kyma Revealed p 351 be helpful?

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bluefire
Member
posted 22 May 2009 17:58         Edit/Delete Message   Reply w/Quote
Or would it be practical to cache part of the process (KR p 55)?

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BobTheDog
Member
posted 22 May 2009 19:03         Edit/Delete Message   Reply w/Quote
Hi,

Thanks very much for the info, ForcedProcessorAssignment looks like the way to go. Cacheing is unfortunetaly not an option as it is for real time FX.

Why would it be that Kyma is not spreading the load automatically?

All the best

Andy


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SSC
Administrator
posted 22 May 2009 19:06         Edit/Delete Message   Reply w/Quote
If you change NbrOscillators to 225 (in the OscillatorBank called PolyphonicPitchShift Resynth), the scheduling gets a lot more reasonable.

(We probably have to tweak the computational cost estimate or the bankSize for the OscillatorBank).

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