Bug 216700 - FFTW3 not fast enough...
Summary: FFTW3 not fast enough...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: fftw3
Version: 6
Hardware: x86_64
OS: Linux
medium
low
Target Milestone: ---
Assignee: Quentin Spencer
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2006-11-21 16:40 UTC by Randy Zagar
Modified: 2008-01-06 21:49 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2008-01-06 21:49:49 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description Randy Zagar 2006-11-21 16:40:31 UTC 
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):
fftw-3.1.2-3

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 21:49:49 UTC 
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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