[Jack-Devel] jackdbus process eats two CPU cores for hours on end

[Thomas Howe]

https://www.youtube.com/watch?v=Aypje2qZPxs - here's a YouTube version of
the original video, maybe that will work better.

It does seem to be consistently 6 hours and 13 minutes before the process
spike, even when the sample rate is changed from 96 kHz to 192 kHz.

I think the spike is happening in the realtime threads (see
https://drive.google.com/open?id=0B2eROo5JatB4am00R2NsS3R6bVk for a
low-contrast screenshot of top), so I'm going to try running Jack with
realtime disabled this time.

On 5 December 2016 at 09:25, Stéphane Letz <letz at grame.fr> wrote:

> You should try to find out which thread eats the CPU.
>
> Stéphane
>
> > Le 5 déc. 2016 à 01:34, Thomas Howe <tho7maspenguin at gmail.com> a écrit :
> >
> > It happens without dbus support (although it is still jackdbus
> installed).
> >
> > This time it lasted between 6 hours and 6 hours 30 minutes, and the
> video shows between 6 hours 12 minutes and 6 hours 13 minutes, so I'm
> guessing it's about the same duration each time before it spikes, but I'd
> need to verify this to be sure.
> >
> > I guess I'll try the jack2 package instead. Any ideas on where I should
> report this bug?
> >
> > On 4 December 2016 at 20:43, Thomas Howe <tho7maspenguin at gmail.com>
> wrote:
> > I haven't measure how long it takes to happen, but it tends to be 'after
> a while'. This is the first time I've realised it stops after several more
> hours, which was a surprise. I'm trying to measure how long it takes now.
> >
> > Is there a way to figure out what's getting processed when this happens?
> >
> > I'm currently running the process with both of QJackCtl's d-bus boxes
> unticked to see if (and when) it happens again. PulseAudio isn't installed
> and I didn't have my ALSA bridge running when recording the video, but I
> won't start it today anyway just in case it would make a difference. No
> process spike yet...
> >
> >
> > On 4 December 2016 at 11:01, Harry van Haaren <harryhaaren at gmail.com>
> wrote:
> > On Sun, Dec 4, 2016 at 4:26 AM, Thomas Howe <tho7maspenguin at gmail.com>
> wrote:
> > I'm having a problem with the jackdbus process; after some hours it
> starts maxing out two of my four CPU cores, which in turn causes xruns when
> running apps. It looks like other people have found the same problem, but
> no solutions.
> >
> >
> > I could well be wrong; but my suspicion is not on audio threads - but
> rather management threads for things like DBus integration, or other "non
> realtime" operations. If it was the audio thread that was causing the
> deadlock and spinning, you would hear *no* audio at all.
> >
> > So next steps I'd suggest running without any extra features (disable
> Dbus support, or Pulseaudio integration, or ALSA loopback devices, or
> anything else that's not "core" JACK). See if it still happens..
> >
> > Good luck! -Harry
> >
> > --
> >
> > http://www.openavproductions.com
> >
> >
> > _______________________________________________
> > Jack-Devel mailing list
> > Jack-Devel at lists.jackaudio.org
> > http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org
>
>
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