[PD] Pd 0.52-1 - frozen dsp and gui in ubuntu 20.04

Roman Haefeli reduzent at gmail.com
Tue Mar 22 15:39:16 CET 2022


On Tue, 2022-03-22 at 15:23 +0100, IOhannes m zmoelnig wrote:
> On 3/22/22 15:06, Roman Haefeli wrote:
> > On Tue, 2022-03-22 at 14:56 +0100, Christof Ressi wrote:
> > > > Anyway, I can open an issue to describe that in my case DSP
> > > > only
> > > > works with callbacks on.
> > >   Yes, please! The Jack backend is supposed to work regardless of
> > > the
> > > "callback" setting.
> > 
> > But not regardless of the "delay (ms)" setting. If it is too low,
> > Pd
> > won't process audio. I don't know if there is a way to know
> > beforehand
> > what 'too low' is. It isn't necessarily a bug in Pd, I'd say.
> 
> it's probably a bug in Pd if the DSP and the GUI both freeze.

Indeed, if the buffer is set too small, then Pd GUI freezes! 

From my anecdotal testing, it looks like the critical value is
predictable. As Christof said, the buffer cannot be smaller than JACK's
blocksize. 

For instance with JACK @ 256 samples @ 44.1kHz (5.8ms):
  - Pd works with 6ms
  - Pd freezes with 5ms

I guess the dialog could be designed in a way to set a lower boundary
that is dependent on the detected JACK blocksize. I don't know,
however, if Pd is able to detect the blocksize before DSP is turned on.

Roman 
 
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