[smooth-biquad~] CPU consuming


    May 08 2008 | 2:31 pm
    Hi (and especialy hi to cnmat),
    I recently replaced my 64 [biquad~] instances in the patch I'm working on by [smooth-biquad~]s. Under some conditions (in that particular case, stopping a [groove~] or a [sfplay~], which is the only sound source in the patch), the CPU usage starts to raise up to 100%. This doesn't happen with the regular [biquad~] object. Turning the DSP off and on puts MSP back to a normal state, as does a "clear" to all instances. Most of the [smooth-biquad~] are in muted voices of [poly~]... I know I'm vague but I couldn't reproduce this on small patches. Could it be related to this denorm bug on intel? I can't test on a PowerPC now, but will as soon as I can.
    _____________________________ Patrick Delges
    Centre de Recherches et de Formation Musicales de Wallonie asbl http://www.crfmw.be/max

    • May 08 2008 | 2:55 pm
      I have found that I have to mute poly~ voices with a load bang. They don't seem to be born muted.
      Cheers Gary Lee Nelson TIMARA Department Oberlin College www.timara.oberlin.edu/GaryLeeNelson
      On May 8, 2008, at 4:31 PM, Patrick Delges wrote:
      > Hi (and especialy hi to cnmat), > > I recently replaced my 64 [biquad~] instances in the patch I'm > working on by [smooth-biquad~]s. Under some conditions (in that > particular case, stopping a [groove~] or a [sfplay~], which is the > only sound source in the patch), the CPU usage starts to raise up > to 100%. This doesn't happen with the regular [biquad~] object. > Turning the DSP off and on puts MSP back to a normal state, as does > a "clear" to all instances. Most of the [smooth-biquad~] are in > muted voices of [poly~]... > I know I'm vague but I couldn't reproduce this on small patches. > Could it be related to this denorm bug on intel? I can't test on a > PowerPC now, but will as soon as I can. > > _____________________________ > Patrick Delges > > Centre de Recherches et de Formation Musicales de Wallonie asbl > http://www.crfmw.be/max >
    • May 08 2008 | 6:59 pm
    • May 09 2008 | 7:53 am
      I had a chance to test my patch on a G5 (OSX.4.11), and there is no problem on it. So it seems to be related to intel (core 2 duo, X.5.2, Max 4 and Max5).
      p
      On 8 mai 08, at 16:31, Patrick Delges wrote:
      > Hi (and especialy hi to cnmat), > > I recently replaced my 64 [biquad~] instances in the patch I'm > working on by [smooth-biquad~]s. Under some conditions (in that > particular case, stopping a [groove~] or a [sfplay~], which is the > only sound source in the patch), the CPU usage starts to raise up to > 100%. This doesn't happen with the regular [biquad~] object. Turning > the DSP off and on puts MSP back to a normal state, as does a > "clear" to all instances. Most of the [smooth-biquad~] are in muted > voices of [poly~]... > I know I'm vague but I couldn't reproduce this on small patches. > Could it be related to this denorm bug on intel? I can't test on a > PowerPC now, but will as soon as I can.
      _____________________________ Patrick Delges
      Centre de Recherches et de Formation Musicales de Wallonie asbl http://www.crfmw.be/max