[CLAM] CLAM and fftw

David García Garzón dgarcia at iua.upf.edu
Thu Mar 22 10:42:16 PDT 2007

You can have both, fftw and fftw3 enabled at the same time.

Most CLAM processing use now a generic 'FFT' processing object which renders 
to the faster implementation enabled on compilation. In that order: FFTW3, 
FFTW2, Ooura. You can also choose an specific implementation.

FFTW3 is stable and fully functional. It still needs some efficiency 
improvements but even under optimized its performance is better (75% the time 
it took) than FFTW2.


On Wednesday 21 March 2007 06:18:53 Dominique Michel wrote:
> Hi,
> I see at CLAM have an optional dependency on fftw-3. I found this mail
> http://llistes.projectes.lafarga.org/pipermail/clam-devel/2007/000163.html
> But I am not sure of the status of fftw-3 on clam. Are all the functions
> implemented?
> fftw-2 and -3 are sloted on gentoo, so it is possible to have both in the
> system. When configuring clam to use fftw-3, must I use
> "scons with_fftw=no with_fftw3=yes" or "scons with_fftw=yes
> with_fftw3=yes"?
> Cheers,
> Dominique
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> CLAM at iua.upf.es
> http://www.iua.upf.es/mtg/clam

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