[PlanetCCRMA] jackstart hanging the system

Fernando Pablo Lopez-Lezcano nando@ccrma.Stanford.EDU
Fri Dec 20 17:48:00 2002

> I just have installed the Planet CCRMA packages and i have a problem
> with Jack. When i try to run 'jackstart -R -d alsa -d hw -r 44100' my
> CPU and Memory usage goes to 100%. If I don't stop it, the process hangs
> everything. Even a 'jackstart -h' do the same! 

Strange, I have not seen this happen before...

> There is no problem when I run 'jackd -R -d alsa -d hw -r 44100', but as
> a normal user I don't have the realtime priority for Jack. What can be
> wrong?

Did you try running as a normal user without the -R flag? I really don't
know how to start to debug this at all, and don't remember seeing
anything like this in the alsa or jack lists. 

> I'm using the kernel provided by PlanetCCRMA (2.4.19-1.ll) with
> lowlatency activated, and the alsa drivers running OK. I have a Athlon
> 1Ghz, 512Mb Ram, Sblive sound card.

I assume that you can play and record sounds with no problems, right?

You could also try running jack for output only, add the "-P" flag at
the end of the command line. Just to see if it makes a difference. 

-- Fernando