I just ran into this issue as well on my Gentoo system after a fresh system install. I started jack from the command line to see if the problem had to do with qjackctl and it didn't cause any excess CPU usage, but then when I started Ardour, the excess CPU usage started up again. If I'm having the same issue as you, it would seem that the problem occurs when a GUI based jack app starts up. Perhaps it's a jack related issue with realtime and GUI libs? -Reuben Back on Sunday 30 March 2008, hanaghan@xxxxxxxxxxxx was like: > Hi Rui, > thanks for the reply. > > Ok...just to add, I rebuilt from the SRPM (same spec file though) and no > change. I also installed Gnome and it does it from there as well, just to > further support your point. > > I will email thac and see if we can figure it out. > > thanks, > R > > > hanaghan@xxxxxxxxxxxx wrote: > >> Hi folks... > >> > >> I still running PCLinuxOS and using Thacś RPMś. > >> > >> Without version numbers of lots of libs, the version numbers in the > >> subject line are relevant to my system. Hopefully thatś enough. > >> > >> > >> I set up a new box from the live CD and added all the audio stuff from > >> apt. Everything worked fine...I updated to Qjackctl 3.2 from and older > >> version even and still no problems. I then did a jumbo update out of > >> Synaptic... > >> > >> When I run Qjackctl or Qsynth in KDE, the CPU usage shoots to the > >> moon. This has happened on another install of the same distro in the > >> the very same sequence and manner. I dont think itś Qjackctl that > >> is the issue..otherwise it would have done it when i first upgraded to > >> 3.2 using QT4. Even though Qsynth shows the same symptoms, pointing > >> toward a possible QT4 issue, that makes no sense either...again, it > >> would have done it before. > >> > >> I suspect something in KDE is doing it. I tried running from Fluxbox, > >> and same thing...but doesn Fluxbox use some KDS libs anyway? > >> > >> I guess I can install Gnome and try that but really dont want the > >> clutter on the machine. Anyone know anything about this? I saw another > >> post on Linuxquestions.org about the same thing on another distro... > >> > >> TIA for any help. > > > > a very similar issue has been experienced before, iirc. it has been > > reported that on debian etch and ubuntu, qjackctl 0.3.x was peaking to > > 100%cpu usage (not %dsp load) and right after jackd is started. > > > > this issues blame has been pointed to libqt4 itself, more specifically > > to the QProcess class wich deals to process interface coordination and > > to the extent of my knowledge a mere qt4 upgrade, from the testing (or > > lenny) repositories, sufficed for the issue go away. > > > > so it seems to be a strict qt4 issue, maybe related to the way it's > > built but not sure (i never had the issue duplicated myself) > > > > hth > > > > cheers > > -- > > rncbc aka Rui Nuno Capela > > rncbc@xxxxxxxxx > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
