[PD] Running Pd with real-time priority

katja katjavetter at gmail.com
Wed Mar 29 08:29:34 CEST 2017

Which Pd version do you run? I remember having the same issue with Pd
on Raspberry Pi some years ago. Pd at that time asked for rtprio 99
and didn't get it with jackd default settings. In response Miller has
then changed Pd's rtprio requirement to 95 (I don't remember which Pd
version exactly, it was probably around 0.45). If the Odroid image
ships an old Pd, setting rtprio 99 could make the difference.


On Wed, Mar 29, 2017 at 1:16 AM, Alexandros Drymonitis <adrcki at gmail.com> wrote:
> When running Pd, it is supposed to run with real-time priority by default,
> right?
> When launching Pd from the terminal, you usually get this printed:
> priority 6 scheduling enabled.
> priority 8 scheduling enabled.
> I'm running Pd on an Odroid-U3, and launching Pd from the terminal doesn't
> print anything like this.
> I'm using Pd with jack, which I run with real-time priority (I'm using
> Qjackctl and I'm clicking on the Realtime tick-box). I have the following
> both in /etc/security/limits.conf and in /etc/security/limits.d/audio.conf:
> @audio   -  rtprio     95
> @audio   -  memlock    unlimi
> ted
> @audio   -  nice      -19
> The user odroir (which is the default user in the Odroid image) is a member
> of the audio group. What am I missing here? Is Pd running with real-time
> priority indeed, or do I need to do something more than that to run with
> real-time priority?
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