[PD] DSP crashing - PD freezes.

[Roman Haefeli]

On Sun, 2023-02-05 at 11:45 +0100, Roman Haefeli wrote:
> 
> And now - this sounds a bit crazy - while testing the scheduling_fix
> build, the official releases (0.53-1, 0.52-2, etc.) didn't exhibit
> the
> high CPU usage anymore. Later, after some more testing, it happened
> again though, but not with the scheduling_fix build. It's really
> difficult to determine exactly what circumstances lead to the high
> CPU
> usage. It's as if it's possible to "taint" CoreAudio and the
> scheduling_fix somehow "untaints" it. 

After some more testing, the more likely reason for same Pd version
showing different behavior is found in the saved preferences. The issue
is much more likely triggered, when enabled callbacks are saved in the
preferences and thus Pd enables callbacks at loading time. Toggling DSP
then will almost certainly trigger high CPU usage.

Sorry for the confused reporting. Things are not trivial.

Roman 
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