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(a)starband.net 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(a)starband.net 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(a)rncbc.org
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