Red Hat Bugzilla – Bug 216700
FFTW3 not fast enough...
Last modified: 2008-01-06 16:49:49 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):
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"
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.