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Re: FFTW3.0.1 wisdom


From: David Bateman
Subject: Re: FFTW3.0.1 wisdom
Date: Thu, 19 Feb 2004 17:38:12 +0100
User-agent: Mutt/1.4.1i

Be careful here, because it might not be just processor dependent, but
also dependent on the amount of memory available. FFTW might use some
technique where it allocates large blocks of memeory to speed up FFT's
but if you use say wisdom generated on a machine with 512MB on one with
128MB uou might, even with the same processor you might be surprised...
These are just my speculations, I don't know what FFTW really does
internally .....

D.

Dapr├Ęs Paul Kienzle <address@hidden> (le 18/02/2004):
> Please link to this from somewhere in wiki.octave.org.
> Or maybe we should put it in octave-forge.  Even if octave
> ships with a common set, we need a place for community
> contributions.
> 
> Even better would be to tag the wisdom with all the
> relevant machine parameters in a way that allows
> people to automatically select the most appropriate
> wisdom file from a collection.
> 
> Would such files be usable directly by e.g., scilab,
> R, matlab, etc.?  Perhaps a wisdom repository already
> exists.
> 
> An atlas repository would also be nice, however
> standards for overriding xerblas are needed before
> that is possible.
> 
> Paul Kienzle
> address@hidden
> 
> On Feb 17, 2004, at 6:05 PM, Dmitri A. Sergatskov wrote:
> 
> >I put 'wisdom' file I generated on my computer on
> >http://coffee.phys.unm.edu/dima/octave/
> >(file wisdom-athlonMP).
> >
> >The cpuinfo is in file athlonMP.txt
> >
> >Though FFTW people recommend generating wisdom  file for each
> >installation, it could still help people who do not want to
> >spend ~10 hours doing it.
> >
> >Sincerely,
> >
> >Dmitri.
> >
> >
> >
> >
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> 
> 
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> Octave is freely available under the terms of the GNU GPL.
> 
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-- 
David Bateman                                address@hidden
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
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