hello,
thanks all for your answer.
I'm now back home, and (thanks to Murphy's law), the problem can't be
reproduced.
I noticed a bad (physical) Fire wire connection on the cable after the
performance, but now it is ok.
maybe my audio buffer was too small and any other computer activity could break
the connection between pd and jack (but not between audacity and jack)
so the only valid hypothesis i can find is :
- too small buffer for jack configuration
- bad pd implementation of jack
- automatic script in ubuntu that start in bad timing (friday 19h30)
- bad priority between pd and ubuntu script
it's just discouraging that thing worked for 60h straight and crash during the
20 min performance.
The only lesson i can find is that "with computer, you can't prove things are
working, you can only prove that things don't work".
did anyone ever experience a slow down due to ubuntu automatic script that
should run on the background?
how to easily disable them? (cron?)
thanks,
Cyrille
Le 09/07/2011 22:31, Hans-Christoph Steiner a écrit :
Well, you have an amazing track record, so I wouldn't sweat too much. Hopefully
the rest of the performances go smoothly.
Random freezes are often caused by bad memory, that sounds like the most likely
cause here. It can just affect a single program if its only a small part of the
memory that is bad. running memtest for a while might find something. If its
not bad memory, it could be some other bad hardware. If its a dusty old
computer, it would be worth while to blow all the dust out, and re-seat the
cards and the RAM.
.hc
On Jul 8, 2011, at 12:57 PM, cyrille henry wrote:
hello,
i need help to understand a major problem i had today.
i'm unsing a old computer for a project, running ubuntu linux 10.04, with a
presonus FP10 fire wire soundcard with jack.
everything was running fine for weeks when we worked on this project.
i boot this computer 3 days ago, start pd and everything was working wey well
for all rehearsal.
(i did not close pd since)
the problem i've experience is that pd freeze during the performance.
(fortunately, it was 10 000 Km away from where i'm living so i have no friend
on the audience)
This is my 1st unexpected pd freeze (when i'm not on edit mode) since i begin
using pd, 11 years ago.
i'm running pd vanilla with almost no externals
thanks to Murphy's law, it occur in performance, and not in rehearsal.
worst of all : i don't know what is the problem, and can't make things work
again.
So, the 1st thing i could imagine is a hardware problem, since the software was
tested for month.
(This patch work for weeks without closing pd, and this pd installation run for
8 month for an installation).
fact are :
- after rebooting the computer/soundcard etc, jack start and works
- audacity can connect to jack.
- pd crash on start-up if started with jack.
- i do not change anything about pd
- i did not physically touch the computer for the last 10 minutes before the
freeze (everything is automatized)
- this computer is not connected to internet, i did not do any update since it
was stable.
- the soundcard works OK on an other computer on osX.
i'll use another computer for tomorrow performance, and i'll have more time to
understand the problem when i'll be back home, however i would really
appreciate to understand as soon as possible what could cause a huge problem
like what i experience today.
So, with that mail i share my shame with you, but i also really apreciate to
have some pointer about what to test in order to understand the problem.
Why pd can't connect to jack anymore, since jack work and noting was change
about pd?
and why this occure during a live performance...
thanks for your consideration,
cheers
Cyrille (sad)
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