Marc Collin <collinm@laboiteaprog.com> writes:
Le mercredi 13 septembre 2006 11:04, Andreas Jaeger a écrit :
Marc Collin <collinm@laboiteaprog.com> writes:
i use suse 64bits since a couple of release and one thing i notice it's slower than the 32 bits and slower than other 64 bits distribution (fedora and mandrake)
don't know if you use tuning option when you build...
We do build with -O2. Such a speed difference is interesting and I would be interested in the cause,
Andreas
minimum to be done: -march=x86-64
This is the default for x86-64 ;-)
i think x86 64 bits have minimum sse2
-mfpmath=sse2
This is written in the ABI, no need to add it.
-msse2
Same here.
-funroll-all-loops
This might be slower in some cases.
-fomit-frame-pointer
This is part of the ABI, no need to do it ;-)
-ffast-math
You will break applications this way. Andreas -- Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj/ SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126