[Ardour-Users] jack and ardour disconnecting/crashing while using Csound

[Jörn Nettingsmeier]

Paul Davis wrote:
> On Thu, 2008-10-23 at 02:16 -0400, Hector Centeno wrote:
>> Hello,
>>
>> I just worked on a project that involved recording several tracks of
>> sound synthesized by Csound in realtime (tried both official 5.09 and
>> CVS build) plus ambisonic ladspa panners, ambdec (ambisonic decoder)
>> and jconv (convolution application). I started this project using
>> Ubuntu Studio Linux and ended it with OpenSuse (both using their
>> respective RT kernels and getting same problems with both). It became
>> a very unstable combination since every time I stopped Csound,
>> randomly Ardour would disconnect from jack or jack would crash, and
>> then I was unable to make Ardour reconnect after restarting jack (it
>> would complain about not being able to reconnect the ports). It was
>> happening so regularly that I had ready on my desktop a couple of
>> scripts to restart everything.
>>
>> Is there anything I could do to avoid this? Is it Csounds fault? Is it
>> my system? Jack is running like this: jackd -R -P60 -p1024 -t2000 -u
>> -dfreebob -r48000 -p1024 -n3 -D (using a Edirol FA-101). Could this be
>> a realtime priorities issue? I installed the rtirq script by Rui Nuno
>> Capela tunned to prioritize the firewire ports and made sure Jack is
>> running at a lower priority (firewire is at 70). Jack's version is
>> 0.109.2 and Ardour's is 2.5.
> 
> Some of your instability probably comes from JACK 0.109.2 (not all of
> it, but some). There will be a new release out very soon which will fix
> the JACK-contributed portion. If you feel comfortable doing it, then you
> can use JACK from svn already.

i second that. 0.109 has been really flaky for me, and svn improved
stuff *a lot*. my ffado setup is still not as rock-solid as my rme
digi9652, but usable.

> I repeat what I have said so often: there is almost never any reason for
> users to use the -P flag to JACK. Unless you are working on a special
> system, just leave JACK to pick priorities. 

hmmm. qjackctl will always set it iirc, which is why everybody ends up
using it. maybe we should approach rui to change that behaviour?



-- 
Jörn Nettingsmeier

Verantwortlicher für Veranstaltungstechnik

Audio and event engineer
Ambisonic surround recordings

nettings at stackingdwarves.net
+49 177 7937487