Hi, this is to share an unhappy experience I had with csound and 
GNU/Linux in a realtime setting.

During our last live performance (>200 people attending) my laptop 
freezed twice while running Csound (plus, Csound "segfaulted" once). 
When this first happened we pretended the sudden silence was a wanted 
effect, but the following hangs put us really closed to panic.

I used fltk'ed csound v. "4.24.1" (Istvan Varga patches) for ALSA audio.
Kernel and ALSA are those from Planet-CCRMA (over RedHat 9).
Audio hw is M-Audio Quattro, laptop is a "standard" Dell P4-HT 3.2Ghz.

I use csound as an effect processor (mixer fx send to csound audio in, 
csound audio out routed back to mixer fx return), so both "ins" and 
"outs" operators occurs on the same instrument.

I say that because I've never experienced any problem with Csound using 
it as an audio "input only" or "output only" machine (and without 
graphic widgets).

The computer freezes occured while using beautiful Oeyvind Brandtsegg's 
ImproSculpt. This huge patch uses fltk widgets heavily (expecially 
vu-meters are resource demanding, I guess), so I suspect the problem is 
somewhat related to xwindow event handling (i.e. a XFree86 video driver 
issue) conflicting with real-time priority ("--sched") for audio, 
together with some issue of snd-usb-audio ALSA driver.

I'd like _very_ much to understand what went wrong, and possibly 
contribute and solve this problem, but so far I really don't know how to 
face it.

Any help?

Many thanks in advance,
- Fabio

-- 
Fabio Barbon
Automated Reasoning Systems - Formal Methods Group
IRST - Istituto per la Ricerca Scientifica e Tecnologica
http://sra.itc.it/people/barbonfab
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