Re: [fluid-dev] ALSA driver consuming too much CPU

[Josh Green]

It is indeed known about, but should have been fixed a while ago..  I'll
do my best to fix this issue and get a release out soon.  Best regards,
        Josh


On Thu, 2006-11-16 at 11:50 -0700, Garett Shulman wrote:
> I believe that this is a known glitch between fluidsynth and alsa plug. 
> Check out:
> http://www.mail-archive.com/address@hidden/msg00183.html
> 
> Paul Millar wrote:
> > Hi all,
> >
> > Inspired by Nathan Harrington's article on monitoring computers with 
> > FluidSynth (recently linked to from Slashdot), I've started coding against 
> > FluidSynth's C-library: libfluidsynth.
> >
> > I'd like to say first how easy it was: libfluidsynth is a very nice library!
> >
> > The main reason for writing is I've noticed a problem with the ALSA driver.
> >
> > Pretty much as soon as I do new_fluid_audio_driver(), I see 100% CPU usage. 
> >  I 
> > see this both on my elderly laptop (P3-733MHz) and slightly less elderly 
> > desktop (P-4 1.7GHz).  Despite the differences in CPUs, in both cases the 
> > audio sounds OK.
> >
> > If I use the OSS driver (which, I presume, ALSA is emulating) then the CPU 
> > load is vastly reduced (i.e. I have some spare CPU cycles!).
> >
> > The desktop is running Debian testing (kernel: 2.6.17-2-686, libasound2: 
> > 1.0.13-1).  The laptop is running Debian sid.  I don't have access to it 
> > right now, but it should be running 2.6.18-2-686 kernel package and the 
> > same 
> > version of libasound2 library.
> >
> > My code uses audio.period-size = 10000 and audio.periods = 10000 by 
> > default, 
> > simply because those were the values used in the Nathan's article.
> >
> > If it helps any, my code has two files that interfaces with libfluidsynth: 
> > interface.c (mostly initialisation) and conductor.c (which starts and stops 
> > notes).  The files are available from:
> > http://monami.cvs.sourceforge.net/monami/MonAMI/src/fluidsynth/interface.c?view=markup
> > and
> > http://monami.cvs.sourceforge.net/monami/MonAMI/src/fluidsynth/conductor.c?view=markup
> >
> > So, is there anyway I can "turn down" the CPU usage?
> > (both in general, and for the ALSA driver).
> >
> > Cheers,
> >
> > Paul.
> >   
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > fluid-dev mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/fluid-dev
> >   
> 
> 
> 
> _______________________________________________
> fluid-dev mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/fluid-dev
>