[PD] DSP crashing - PD freezes.

[Christof Ressi]

The callbacks option has always been broken in some way or another.

Please try my scheduler_fix branch: 
https://github.com/pure-data/pure-data/pull/1756. It would be great to 
get some feedback on this. Personally, I have been successfully using it 
on Windows for a few months, but I didn't really test on macOS or with 
Jack so far...

Christof

On 04.02.2023 10:59, Roman Haefeli wrote:
> On Sat, 2023-02-04 at 10:04 +0100, Dan Wilcox wrote:
>> Do you have callbacks enabled? If so, disable the checkbox in the
>> audio dialog.
> So what's the deal with Callbacks on CoreAudio/macOS? On all the
> combinations of Pd version and macOS version I tried, funny things
> happen with callbacks enabled. Are there situations when using
> callbacks  (on CoreAudio) bring any benefit? If so, what are those
> situations? I think I understand how callbacks affect the interaction
> between Pd and JACK when using JACK, but it's a bit opaque to me what
> their purpose is when using CoreAudio. On Jack, using callbacks makes
> Pd not add any additional latency on top of JACK's own latency. So,
> which latency critical applications, I was hoping to affect latency in
> similar way by using callbacks with CoreAudio.
>
> Once I touch the callback toggle, I see Pd's CPU usage jumping to 100%
> and there is no way to make go back. Even when I send `@callback 0`
> using the mediasettings library, things go havoc. Once in that state,
> it cannot be undone by toggling callback (or sending '@callback 1,
> @callback 0' to [audiosettings]). Only a restart of Pd helps.
>
> Is it expected that Pd uses 100% of core with callbacks enabled? Or
> should I report a bug? What's the supposed benefit of that toggle?
>
> Roman
>
>   
>
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