[PD] pd pushing cpu on fast laptop, while running clean on slower machine

cyrille henry cyrille.henry at la-kitchen.fr
Fri Jan 7 12:20:48 CET 2005


hello,

it may comes from a denormal problem.
i think vibraphone~ is based on a physical model, so there is certainly 
a loop inside.

I may wrong, but you should have a look at denormal on this list archive.

hope that help
cyrille


andersvi at extern.uio.no wrote:
> Hello pd-folks!
> 
> I have a problem someone might have a solution to.  Same pd-patch
> giving wildly different results on 2 machines.
> 
> Using a section of several [vibraphone~] objects from the
> percolate-lib, PD eats all my cpu, pushing it above 90%, and
> destroying sound.  The machine is a Dell 5150, with 2.8GHz cpu.
> 
> The same patch runs clean (stays around 20% cpu) on another
> machine here, with slower cpu!  (somewhere around 1.4GHz)
> 
> The computer giving me aches is a Dell laptop, inspiron 5150,
> running fedora core 2, with planetccrma-low-latency kernel.
> 
> uname -a: Linux localhost 2.6.7-1.437.1.ll.rhfc2.ccrma #1 Thu Jun
> 17 10:45:42 PDT 2004 i686 i686 i386 GNU/Linux
> 
> Pd is:
> 
> CVS-version:            Pd version 0.39 TEST 0
> Planet-CCRMA-version:   Pd version 0.37.1 devel
> 
> Tried with pd from planet-ccrma and latest cvs-version compiled
> on this machine.  Both the percolate-lib coming with the
> ccrma-dist, and one i built from a src.rpm on this machine.  Same
> result whatsoever.
> 
> Ive tried shutting of the 'cpuspeed' process to keep the latptop
> running at full speed all times, but it didnt do much with the
> problem.  Pd very soon hits 97-98% and stays there.  Only save is
> to run pd -r 22050, where the patch runs around 40-50%.
> 
> Anybody got a clue?
> 
> Thanks,
> 
> -anders
> 
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