[PD] pd clicking with jack/linux
Atte André Jensen
atte.jensen at gmail.com
Tue Jul 1 13:09:49 CEST 2008
Hi. Thanks for the reply!
Basically I think my problems came from using array (and not table) to
store a sample. Pd gave DIO errors when switching to the window
containing the patch. Is this normal, and is there a way to avoid it,
for instance running the gui in a separate thread?
After switching to table (with very little testing, though) everything
seems to work just fine :-)
So the rest of this mail is releated to a patch using the problematic
> i don't use pd-extended, but i think it's almost the same. the only
> option missing is: -nosleep (useful for dual-core).
I'm on a single core, so I guess -nosleep doesn't matter, right?
> so be sure in qjackctl - setup:
> Periods/Buffer: 2
> Sample Rate: 44100 (or more)
> Frames/Period: 256 (i am running at 64 without glitches)
Something like that, although periods/buffer is 3 here (seems to work
better in general with my sound card).
> then for pd:
> pd -rt -jack -r 44100 -nosleep -audiobuf 256 -channels 16 -alsamidi
> -mididev 1 etc...
1) "pd -?" says -audiobuf is in ms, so 256 wouldn't make sense, or...?
2) I thought that jack clients automatically got the same buffer size as
jack, which means that is doesn't make sense (or any difference) to
specify that for the client. Same with -rt, I thought that clients
"enherited" the realtime priority from jack...
> and finally, be sure to edit /etc/security/limits.conf:
> @audio - rtprio 99
> @audio - memlock unlimited
> @audio - nice -20
> and of course, add yourself to audio group (reboot to be sure). let us
I already had that (or something *very* similar).
> ah yes, a long time ago i was using icewm, because gnome was causing
> glitches in pd. but now it seems ok here.
I now tried with openbox (lighter than icewm) and the problem is the same.
peace, love & harmony
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