[PD] pd~ and DIO errors

Dan Wilcox danomatika at gmail.com
Sun Apr 4 17:26:18 CEST 2010

On Apr 3, 2010, at 2:39 AM, tim vets wrote:

> Hi all,
> I have a rather heavy patch which causes DIO errors when I switch~ on several subpatches.
> I'm running pd + Jack on a rt kernel (ubuntu-studio Hardy),... Jack shows little or no Xruns.
> Now I wanted to try and optimize the patch by using [pd~].
> The way I understood it is that [pd~] will start a subprocess and it will (automatically ?) divide the audio computation load over multiple processors.
> However, I get the impression that by using [pd~] I get the same (or even worse) results as with my regular "abstraction / [switch~]" approach; DIO error crackles.
> Any advice very welcome!

Have you had clicks before?  In my experience running Linux, I have had much fewer dio errors (basically none) running pd -rt on a *non* realtime kernel.  I use the basic Ubuntu kernel with realtime privileges enabled, no running pd as root.  I also do not use jack but alsa directly, which seems more stable.

Dan Wilcox

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