I'm
setting up an art installation which has to run for hours on end
without intervention, and this seems to be happening after some time
(running jack in realtime mode).
Since you are running unattended for hours, I assume that your
appliction does not really need a grapic userinterface hanging around.
Over in the CUDA land I am currently investigating, it sometimes helps
(a lot) to start daemon-like applications from the console rather than
an Xterm.
Give it a try?
The audio isn't super intensive, a handful of synth units and some sample
playback, but (now it's fixed) it works nicely alongside fluxus.
cheers,
dave