[Pw_forum] fftw3

Alexander Shaposhnikov shaposh at isp.nsc.ru
Wed Sep 7 09:58:26 CEST 2005

Fftw project is not being developed anymore.
I am having problems with compiling both fftw2 and fftw3
on my machines.
Maybe it would be better to implement support for vendor-specific
fft implementations, for example in mkl, acml and so on. They should be
faster anyway and there will be continuing development.

Best Regards,
Alexander Shaposhnikov

-----Original Message-----
From: pw_forum-admin at pwscf.org [mailto:pw_forum-admin at pwscf.org] On Behalf
Of Paolo Giannozzi
Sent: Wednesday, September 07, 2005 2:53 PM
To: pw_forum at pwscf.org
Subject: Re: [Pw_forum] fftw3

On Tuesday 06 September 2005 19:32, Antonio Suriano wrote:

> Pw is still written using fftw 2.1.5 or something like that ...
> is there  a way to link it to fftw3

no, because v.3 has different calling sequences from v.2

> or is in project to switch to fftw3? 

there is a modified fft_scalar module, written by Pascal Thibaudeau
et al., that works with fftw3 on Alpha and SGI machines, but not on
Intel PCs, for unknown reasons. Apparently fftw3 is slower than 
fftw2 on SGI machines, faster on Alpha but only if memory is
allocated in such a way to be aligned with pages. Anybody interested 
in using fftw3 can start from there, if the author(s) of the modified 
module agree in distributing it.

Paolo Giannozzi             e-mail:  giannozz at nest.sns.it
Scuola Normale Superiore    Phone:   +39/050-509876, Fax:-563513 
Piazza dei Cavalieri 7      I-56126 Pisa, Italy
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