Bug 216700 - FFTW3 not fast enough...
FFTW3 not fast enough...
Product: Fedora
Classification: Fedora
Component: fftw3 (Show other bugs)
x86_64 Linux
medium Severity low
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Assigned To: Quentin Spencer
Fedora Extras Quality Assurance
Depends On:
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Reported: 2006-11-21 11:40 EST by Randy Zagar
Modified: 2008-01-06 16:49 EST (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2008-01-06 16:49:49 EST
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Description Randy Zagar 2006-11-21 11:40:31 EST
Description of problem:
fftw3 is not built with the best-performing compiler flags.  The library, as
delivered, only provides half the performance indicated on the fftw benchmark page.

Version-Release number of selected component (if applicable):

Additional info:
Compiler flags used on the FFTW benchmark page are:

    CFLAGS="-m64 -O3 -fomit-frame-pointer -fstrict-aliasing -mtune=k8"
    FFLAGS="-m64 -O3 -fomit-frame-pointer -fstrict-aliasing"
Comment 1 Till Maas 2008-01-06 16:49:49 EST
Imho this is not a bug in Fedora, because there are reasons to use the currently
used compiler flags. They work for several cpus, they provide additional
security measures and allow easier debugging in case this needs to be done.

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