This is not a very good solution, since I think it causes the JACK to lock up occasionally, but so far I have no clue why pd is having this problem. It appears to only happen with JACK (ALSA runs fine), and I do not have similar xruns with other programs running at the same time (ex. Ardour. Also, qjackctl shows no xruns). I get xruns about once a second, then I do the command "chrt -p 60 [whatever pd's pid is]" and all xruns go away.
<br><br>Anyone know where to look for a solution? It is no good having the audio dropped or, worse, pd crashing occasionally.<br><br>regards,<br>rich<br><br><div class="gmail_quote">On Nov 19, 2007 8:34 PM, Rich E <<a href="mailto:reakinator@gmail.com">
reakinator@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">After setting up ubuntustudio (7.04) with a real-time kernel (
2.6.20-16-realtime), I was experiencing DIO errors every few seconds. Exploring this taught me alot about how to set priorities on a real-time kernel, mainly with the command 'chrt'. However, I don't think it is meant to be used directly on an application, since there might be parts of the application that are not supposed to run in real-time at a high priority.
<br><br>Nonetheless, running:<br>r@pal:/etc/sysconfig$ pidof pd<br>12079<br>r@pal:/etc/sysconfig$ chrt -p 60 12079<br><br>sets pd running as:<br>r@pal:/etc/sysconfig$ chrt -p 12079<br>pid 12079's current scheduling policy: SCHED_RR
<br>pid 12079's current scheduling priority: 60<br><br>and the xruns go away. I don't know too much about the different threads pd is running on, but I was under the impression that pd is supposed to start in real-time with a high priority. Yet, due to the apperant changes from chrt, I would think that it was not running in real-time. I've tried this on versions
0.40-3 and 0.41-7, and real-time scheduling is not specifically turned off in the pd start-up settings. <br><br>Any thoughts?<br><br>regards,<br><font color="#888888">rich<br>
</font></blockquote></div><br>