Forums > MaxMSP

[smooth-biquad~] CPU consuming

May 8, 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 8, 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
http://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 8, 2008 | 6:59 pm


May 9, 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


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