[PD] DSP crashing - PD freezes.

[Theron Trowbridge]

Works for me


Thanks!

-Theron
^


On Sat, Feb 4, 2023 at 6:15 PM Miller Puckette <msp at ucsd.edu> wrote:

> OK, I've uploaded the fix (I hope correctly) to msp.ucsd.edu/software.html
> ,
> as "0.53-2test1".  If that seems to work for everyone I'll rename it
> "0.53-2".
>
> Thanks to all the help from several people (and to the portaudio folks!)
>
> Miller
> On Sat, Feb 04, 2023 at 03:09:21PM -0800, Theron Trowbridge wrote:
> > It works on my Mac Mini M1 (upgraded to Ventura 13.2 last night) as well.
> > The callbacks setting doesn't seem to have any obvious effect, but I
> didn't
> > do anything too crazy with it.
> >
> > Thanks for all the troubleshooting on this, it's a big help for me right
> > now!
> >
> >
> > -Theron
> > ^
> >
> >
> > On Sat, Feb 4, 2023 at 3:22 AM Dan Wilcox <danomatika at gmail.com> wrote:
> >
> > >
> > > On Feb 4, 2023, at 11:46 AM, Denis Połeć <denis.polec at gmail.com>
> wrote:
> > >
> > > As far as I can tell, everything is going smoothly with the callback
> > > settings.
> > > However, I still haven't quite understood what it is for.
> > >
> > >
> > > There was some discussion, maybe a year ago, about changing the name of
> > > this option and finding ways to make it clear what it does.
> > >
> > > Copy/paste from Christof's email replay to Romain, to which you were
> not
> > > in CC:
> > >
> > >  Are there situations when using
> > > callbacks  (on CoreAudio) bring any benefit?
> > >
> > >
> > > With "callbacks" enabled, Pd runs directly on the audio thread.
> > > Generally, this is not really recommended because Pd itself is not
> > > realtime safe. Many operations block for an indeterminate amount of
> > > time, e.g. any call to "malloc()", network IO, file system operations,
> > > etc. The upside is that you can avoid some extra delay (see below).
> > >
> > > With Pd's ringbuffer scheduler (= "callbacks" disabled), you can freely
> > > adjust the delay according to? your needs. (The "delay" parameter
> > > basically sets the size of the ringbuffer.) The price you pay is some
> > > extra delay (1x the hardware buffer size). To minimize this extra
> delay,
> > > you would set the /hardware buffer size/ as low as possible (e.g. 64
> > > samples) since the audio callback does nothing but transfer a bunch of
> > > samples. In this case, the extra latency would be as low as 64 samples,
> > > so nothing to worry about too much.
> > >
> > > (The "callback" option can indeed make a noticable difference when
> using
> > > Jack with larger block sizes. Ideally you would just use the smallest
> > > Jack block size possible, but this might not work well for other Jack
> > > clients...)
> > >
> > > As a side note: up until now, Pd's scheduler thread regularly goes to
> > > sleep for a fixed duration, so it may wake up a bit too late. If the
> > > delay setting is too low, this can lead to drop outs. With my
> > > "scheduler_fix" branch, the scheduler thread waits on a semaphore and
> is
> > > notified immediately when audio data is available. In my experience so
> > > far, this allows for lower "delay" settings than before.
> > >
> > > Christof
> > >
> > >
> > > --------
> > > Dan Wilcox
> > > @danomatika <
> https://urldefense.com/v3/__http://twitter.com/danomatika__;!!Mih3wA!FqFnjr76hFtszjAnbA1NsOhAiVYr40Oy4ngNvn9Zt0ponRrBuOKI_4wLu9ailljbiTbrAq-It2ekk46Iu51F4FI$
> >
> > > danomatika.com
> > > robotcowboy.com
> > >
> > >
> > >
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> > >
>
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