Re: [Jack-Devel] jack consuming large amounts of CPU time

On Tue, Oct 23, 2012 at 10:14:22AM +0200, Robin Gareus wrote:
> On 10/23/2012 08:11 AM, undersys wrote:
> > 
> > I hope someone can give me some guidance with Jack.
> > 
> > I have Jack set up. All seems to work fine. I can record and playback fine etc.
> > My issues starts when I leave Jack running and not doing anything.
> > 
> > It eats CPU % continually. Making my system quite overloaded until I restart Jack. 
> 
> Is it just jackd or are there any jack-clients active when this happens?
> e.g. some reverb effects that just process silence..

That's similar to my thought: perhaps there's some effect (most likely a
reverb) that's not coping with the denormals which are prevalent when jack
is sitting doing nothing.  I have seen similar spikes in CPU consumption
within ardour when the transport is stopped and denormal protection was
inadvertently left off.

If there are no jack clients running - that is, if only jack is running -
then the symptoms seem strange.

Regards
  jonathan

1351118917.18140_0.ltw:2,a <20121024224816.GC26176 at marvin dot atrad dot com dot au>