[PD] glitches when streaming UDP

Martin Peach chakekatzil at gmail.com
Wed Feb 7 16:41:22 CET 2018

On Wed, Feb 7, 2018 at 10:21 AM, Roman Haefeli <reduzent at gmail.com> wrote:

> On Mit, 2018-02-07 at 09:46 -0500, Martin Peach wrote:
> > Maybe there's a way to force all the Pd-related processes to run on
> > the same core, as it could be that the transfer of memory from one to
> > the other causes glitches, so if jackd is on a different core than Pd
> > there will be latency as they transfer access to the buffer from one
> > to the other. Just guessing...
> I tried:
>  * turning hyperthreading off
>  * putting pd and jackd on the same core
>  * putting pd and jackd on different cores
> but those configurations don't seem to affect the current situation at
> all.
> There's also wish, the tcl/tk component.

> Please someone correct me here, but I think it does not matter if pd
> and jackd run on the same core, since they seem to communicate through
> /dev/shm, so there is no gain to be made by being closer together. I'd
> say it makes even sense to separate them so that overall more CPU power
> is available for both.
> Also, the fact the running x instances of 'yes' in the background helps
> indicates that the problem is not the communication between pd and
> jackd.
> Yes it sounds like the things go to sleep when nothing happens for a few
nanoseconds or something.
It should be documented somewhere on kernel.org.

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