Bug 216700 – FFTW3 not fast enough...

Bug 216700 - FFTW3 not fast enough...

Summary:	FFTW3 not fast enough...

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Fedora
Classification:	Fedora
Component:	fftw3 (Show other bugs)
Sub Component:
Version:	6
Hardware:	x86_64 Linux

Priority	medium Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Quentin Spencer
QA Contact:	Fedora Extras Quality Assurance
Docs Contact:

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Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2006-11-21 11:40 EST by Randy Zagar
Modified:	2008-01-06 16:49 EST (History)
CC List:	2 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
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Environment:
Last Closed:	2008-01-06 16:49:49 EST
Type:	---
Regression:	---
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RHEL 7.3 requirements from Atomic Host:
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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):
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 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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