[Insight-users] ITK FFTW vs system FFTW

[Bill Lorensen]

Looks like the fftw folks have made some efficiency improvements.



On Fri, Apr 12, 2013 at 11:18 AM, Simon Rit
<simon.rit at creatis.insa-lyon.fr>wrote:

> I should have mentioned it: yes, it is!
>
> On Fri, Apr 12, 2013 at 5:16 PM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
> > 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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> > --
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>



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