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

[Christof Ressi]

> Could you (or someone) explain briefly what this is for? 
If "callbacks" is ON, Pd runs directly in the audio callback. This gives 
you lower latencies, but less "leeway" for CPU fluctuations - unless you 
increase the hardware/jack buffer size accordingly.

If "callbacks" is OFF, Pd uses a polling scheduler which runs 
independently from the audio callback and exchanges audio via a 
(lock-free) ringbuffer. This ringbuffer essentially adds some extra 
latency, so that Pd is allowed to "fall behind", as long as it can catch 
up again. You can control the latency with the "Delay" setting, 
independently from the actual hardware/jack buffer size, which can be 
quite useful.

As a rule of thumb: don't use "callbacks" unless you *know* that you 
need it :-)

Christof

On 22.03.2022 14:45, Bruno Rohde wrote:
>
>     Turn OFF (or ON) the "use callbacks" checkbox in the audio dialog.
>
>
> That did the trick, with callbacks ON DSP works. I never used it 
> before, and to be honest, I don't know what this does, but for now it 
> solved the problem.
> Could you (or someone) explain briefly what this is for? Is there any 
> impact elsewhere (maybe performance) by using it enabled?
>
> Anyway, thank you so much for the hint.
>
> Cheers
>
>
> Em ter., 22 de mar. de 2022 às 03:46, IOhannes m zmölnig 
> <zmoelnig at iem.at> escreveu:
>
>     Am 21. März 2022 14:18:21 MEZ schrieb Bruno Rohde
>     <brunorohde at gmail.com>:
>      anyone have any information about this problem? Any tips on how to
>     >investigate the cause and solution for it?
>     >
>
>     Turn OFF (or ON) the "use callbacks" checkbox in the audio dialog.
>
>
>     mfg.sfg.jfd
>     IOhannes
>
>
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> -- 
> Bruno Faria Rohde
>
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