[LAU] Fluidsynth, soundfonts, jack, and latency
Guru Prasad B. R.
prasadbrg at gmail.com
Mon Nov 2 08:42:43 EST 2009
Jonathan E. Brickman wrote:
> Guru, do you know what was/is the CPU load during the episode?
No, Jonathan, unfortunately I didn't check... was running behind
schedule before the gig, and haven't been near my system since. It may
take a while for me to get back to my system, and checking CPU load will
be the first thing I intend to do.
Couple of other things that I missed out in previous posts. Firstly,
before the gig I wanted to check whether it was a qsynth-specific or
general fluidsynth issue, so I installed ghostess, which can run
multiple instances simultaneously. I loaded the same soundfonts, and
experienced exactly the same issue - so if there's a bug in the app,
then it must be in the fluidsynth libraries.
Second issue of note: few weeks ago, while still running Ubuntu, I
wanted to find out what exactly caused the jack crash that I reported on
this list at the time (perhaps unrelated to the current issue) . I found
a "stress test" to replicate the problem: hitting a lot of notes while
keeping my sustain pedal down. Initially, the crash would happen within
20-30 seconds of banging the controller (!). When I changed the
polyphony settings from 256 to 64, it would be much more stable - for
more than 10-15 mins of banging! Again, I was able to replicate the same
thing with ghostess.
This incident has left me with a lurking suspicion about a possible bug
in the fluidsynth libraries. I'm curious, though... has anyone else
experienced similar issues?
Looking forward to pointers/feedback/suggestions.
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