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

----- Original Message -----
From: "Jonathan Woithe" <[hidden]>
To: "Robin Gareus" <[hidden]>
Cc: [hidden], [hidden], [hidden]
Sent: Thursday, 25 October, 2012 6:48:16 AM
Subject: 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.


Thanks all for the help and tips.

There is always one jack client running for me and that is my ALSA loop, sadly.
I also noticed I had launched jack with "-Xraw" as acoswt pointed out. I don't use MIDI 
as such I've turned it off.

So now I am going to re run my checks over the next few days to see if it happens again.
With just -Xraw removed it seems not be happening, regardless of having ALSA loop running or not.

Thank you

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