[chuck-users] Raspberry pi and ChucK and performance

Spencer Salazar spencer at ccrma.stanford.edu
Thu Jan 30 04:57:31 EST 2014

I also recommend trying the "experimental" --adaptive:N flag (for N = 128,
256, 512, etc.) for use on embedded platforms. This enables block
processing (with block size N), which can result in a dramatic performance
increase in some cases. It will cause problems though if you are using
feedback loops without delay, or delays shorter than the buffer length N.


On Thu, Jan 30, 2014 at 12:59 AM, Stuart McDonald <stuartcmcd at gmail.com>wrote:

> For anyone heading pi-wards in future, I tried out Perry's advice and
> found dropping to 32khz as well as smarter resource management means I can
> run three concurrent SndBufs (with pans) and a three effect fx chain
> (including a mighty JCReverb!) simultaneously. It's modest, but enough for
> me to achieve the ambient driftyness I wanted. YMMV!
> Cheers
> Stuart
> From: Perry Cook <prc at CS.Princeton.EDU>
>> Thoughts from the battlefield:
>> One nice thing about the Pi is that it supports many
>> sample rates.  So if you can run at 22.05k or even
>> 16k or less, then you'll get much more bang for
>> your buck.
>> Also, you might look into using WvIn (non looping)
>> or WavLoop (looping), rather than SndBuf, because
>> I think I remember that these are slightly more
>> efficient.
>> Look into using some long delay lines (non-interpolating),
>> with feedback.  These can really fatten up a texture without
>> requiring much CPU.
>> Also be judicious about your efx, some will take more
>> CPU than others.
>> Finally, if a wave is not playing sound, unchuck it at the
>> end of the chain, and it won't use any CPU while muted.
>> Keeping track of what's actually sounding, and muting
>> the rest (by unchuck) can really help.
>> Prc
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