[LAU] qjackctl-0.3.x and 49% cpu

[Peter Hartmann]

if I can, I'd be more than happy to help. Would you get more usefull
strace output if you had some break points in where you think the
problem may be?  If so,  I will test on my end.  Let's find facts yo.

Thanks,
Peter

On Nov 27, 2007 6:49 PM, Rui Nuno Capela <rncbc at rncbc.org> wrote:
> John Anderson wrote:
> > On Tue, 2007-11-27 at 14:33 +0000, Rui Nuno Capela wrote:
> >> On Tue, November 27, 2007 12:10, John Anderson wrote:
> >>> I'm finding that qjackctl-0.3.0, 0.3.1 and 0.3.1a all use up 49% cpu. My
> >>> box is a CoreDuo, so that's probably 100% of one cpu.
> >>>
> >>> qjackctl-0.2.22 doesn't do this, so I've downgraded for now.
> >>>
> >>> If it's a bug, what can I do to help?
> >>>
> >> symptoms are that right after jackd is started the first time, qjackctl
> >> starts eating 98% of a cpu, isn't it?
> >
> > It also happens when I have an existing jackd running, and I start up
> > qjackctl.
> >
> >> it's a known issue on some Qt4 incarnations, specially the debian based
> >> ones, iirc. it has been reported on at least one case that updating to a
> >> different libqt4 makes the issue go away.
> >
> > I've just upgraded from qt-4.3.1 to qt-4.3.2, and the problem is still
> > there.
> >
>
> it's not quite a nominal qt4 version issue here, but seems to be due on
> some circumstantial libqt4 build conditions (compile time flags?). for
> example, i had this one report on debian testing (lenny) that the latest
> libqt4-4.3.2 got it through alright, but most of the previous
> iterations, including an early one also tagged as libqt4-4.3.2, was
> indeed infected.
>
>
> >> unfortunately, i never caught that behavior reproduced on any of my
> >> opensuse 10.x boxes, nor in windows :o)
> >
> > Makes it kinda hard to debug ;-|
> >
>
> yes, people handed some strace outputs and it just boiled on some poll()
> calls in libqt4, allegedly under QProcess class implementation. can't
> say or dig any deeper from that, are just suspicions, not facts
>
> cheers
> --
> rncbc aka Rui Nuno Capela
> rncbc at rncbc.org
> _______________________________________________
>
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
>