[Insight-users] ITK FFTW vs system FFTW

Bill Lorensen bill.lorensen at gmail.com
Fri Apr 12 11:16:45 EDT 2013


Is your ITK built Release?



On Fri, Apr 12, 2013 at 11:13 AM, Simon Rit
<simon.rit at creatis.insa-lyon.fr>wrote:

> Hi,
> We have recently observed on a fedora distribution that FFTW is two
> times slower when one uses the ITK compilation
> (USE_SYSTEM_FFTW:BOOL=OFF, default) than when one uses the system fftw
> (USE_SYSTEM_FFTW:BOOL=ON).
>
> We have looked for an explanation in the flags (the Fedora flags are
> available here http://pkgs.fedoraproject.org/cgit/fftw.git/tree/fftw.spec)
> but we have not managed to figure it out. Would someone happen to have
> an explanation and solution?
>
> Thanks in advance,
> Simon
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