[PD] number of soundcard channels and cpu cost

Miller Puckette msp at ucsd.edu
Mon Apr 20 21:50:38 CEST 2015

I think there's a slight penalty but it's not enough to worry about in most
systems.  Anyway, when you don't have any choice, best thing is to just do
it :)

On Sat, Apr 18, 2015 at 02:03:48AM -0300, Alexandre Torres Porres wrote:
> Hi there, recently, I had to use the adat outputs of my audio card in Pd,
> but these channesl are from 16 to 24 (they skip all the analog outs plus
> some other things like SPDIF). My question is, if I ask Pd to work with
> that much audio outputs (24 of them), but only use a couple of outputs
> (like [dac~ 17 20] for example), is it more expensive on the CPU compared
> to if I only have 2 outputs and use [dac~ 1 2]?
> In short, does the cost depend only in the number of outputs in a [dac~]
> object?
> Moreover, does the number of [dac~] objects make a difference? For
> instance, having one [dac~] with many outputs costs the same as different
> [dac~] objects for each output?
> I always had the idea that too many outputs could really mean a lot more
> cpu cost, but I'm not sure now if that cost is really real or relevant.
> what do you say?
> thanks

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