Re: [ecasound] schedule effects

On Fri, Jun 05, 2009 at 03:36:33PM +0200, laurent schwartz wrote:
> Hello Julien,
>
> I've a laptop dell inspiron 1525 (cpuinfo):
>
> model name : Intel(R) Celeron(R) CPU 550 @ 2.00GHz
> cpu MHz : 1995.081
> cache size : 1024 KB
> bogomips : 3993.60
>
> The cpu is not smp.
>
> /proc/asound/cards:
>
> 0 [UM1 ]: USB-Audio - UM-1
> EDIROL UM-1 at usb-0000:00:1d.7-4.3.4, full speed
> 1 [default ]: USB-Audio - USB Audio CODEC
> Burr-Brown from TI USB Audio CODEC at
> usb-0000:00:1d.7-4.7, full
> 2 [Intel ]: HDA-Intel - HDA Intel
> HDA Intel at 0xfe9fc000 irq 19
>
> Your hardware is older than mine ... It is a problem with my setup !
>
> I found a new setup configuration that gives me better result with jackd:
> /usr/bin/jackd -R -dalsa -dhw:2 -r44100 -p256 -n4 -Xseq:
>
> Latency displayed by qjackctl: 11,6 ms
>
> If i do not use the computer while playing audio ... no xrun appears with
> alsaplayer (playing mp3 file) for 10 mn.

> Otherwise xruns occur when using the windowing system ...
 
Hi Laurent,

For any kind of multitrack audio recording, you are better
off working with WAV files. MP3 decoding takes quite a bit
of CPU.

With your system, working with WAV files, I think you may
be able to run a lightweight windowing system. KDE and Gnome
are known CPU hogs. (I normally use fvwm, and have been
trying StumpWM, a lisp-based WM that works similar to
Gnu Screen.)

Graphic recorders such as Ardour, Audacity and various
Ecasound front-ends may also work okay for you. Ardour
and Ecasound perform effects processing while the transport runs.
Audacity processes the whole track beforehand.

cat /proc/interrupts can tell you something about how your
system works, although you may have limited choices for
fiddling them.

Good luck with all of that,

Joel

 
> Memory usage seems good:
> Mem: 2053560k total, 1657276k used, 396284k free, 8972k buffers
> Swap: 3012148k total, 20k used, 3012128k free, 906848k cached
>
> Appart from tweaking the system the only thing i can think of is the CPU
> power.
>
> May be with a dual core, i could assign a core to sound apps and the other
> one to the rest ?
>
> 14:31:04.184 JACK connection graph change.
> **** alsa_pcm: xrun of at least 0.037 msecs
> 14:36:41.416 XRUN callback (1).
> delay of 3577.000 usecs exceeds estimated spare time of 2733.000; restart
> ...
> 14:36:42.175 XRUN callback (1 skipped).
> **** alsa_pcm: xrun of at least 0.040 msecs
> 14:39:22.083 XRUN callback (3).
> **** alsa_pcm: xrun of at least 0.037 msecs
> 14:44:01.362 XRUN callback (4).
> delay of 3595.000 usecs exceeds estimated spare time of 2756.000; restart
> ...
> 14:44:02.658 XRUN callback (1 skipped).
>
> /etc/security/limits.conf
> @audio - rtprio 99
> @audio - nice -10
> @audio - memlock 400000
>
> Hope this help to fix the problem.
>
> Thanks for your help,
> Laurent
>
> 2009/6/5 Julien Claassen <julien@email-addr-hidden-lab.de>
>
> > Hello Laurent!
> > What's your hardware (CPU, soundcard) and what's your kernel-version and
> > how
> > did you start JACK.
> > FYI: I ran happily on a 700MHz CPU with JACK and Ecasound and other
> > software
> > synths. OK, my soundcard is a handsome piece. But I've done work with a
> > simple
> > SBlive or ESS maestro soundcard. It's mostly a question of how to set
> > everything.
> > Best wishes
> > Julien
> >
> > --------
> > Music was my first love and it will be my last (John Miles)
> >
> > ======== FIND MY WEB-PROJECT AT: ========
> > http://ltsb.sourceforge.net
> > the Linux TextBased Studio guide
> > ======= AND MY PERSONAL PAGES AT: =======
> > http://www.juliencoder.de

-- 
Joel Roth
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