[PD] channels and dac
Atte André Jensen
atte.jensen at gmail.com
Mon Sep 17 11:30:55 CEST 2007
Derek Holzer wrote:
> Well, without any flags defined by the starting command or the saved
> settings, then PD would start with two channels (stereo) and adding more
> with the [adc~] or [dac~] would have no effect.
Ok, so I need to specify on the commandline how many channels I need...
> I can tell you for sure that extra channels add extra CPU, due to PD
> maintaining connections with the audio drivers. I notice this when, for
> example, I use my Hammefall DSP with -channels 18 instead of -channels 2
> or -channels 8 or whatever. Some audio drivers are "greedier" than
> others, so switching between them can show you a difference in load.
Ok
> Of course, you can always test these things yourself ;-)
Sure, 32 channels, pd idle uses 3,3%cpu, 2 channels, pd idle uses 2%.
This is on my IBM T41 laptop running jack at 128/3 (latency 8,71 ms).
But I was wondering if it had any impact that would be sporadic, but it
seems not. However I'll modify my startup script to start with
appropriate number of channels...
--
peace, love & harmony
Atte
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