Author: Robert Hyatt
Date: 08:54:32 10/24/04
Go up one level in this thread
On October 24, 2004 at 02:36:11, Michel Langeveld wrote: >On October 24, 2004 at 00:45:21, Eugene Nalimov wrote: > >>On October 23, 2004 at 16:58:22, Anthony Cozzie wrote: >> >>>... >>> Compiling a program in 64 bits will give any program at least a 10-15% >>>performance increase just from the extra registers. >> >>One of the SpecInt2k programs slows down when compiled in 64-bit mode by 30-40%. >> >>Thanks, >>Eugene > >So 11 programs get's faster and one is slower. Good to know. > >I found this link also interesting: >http://www.suse.de/~aj/SPEC/ > >Suse checks out daily the gcc from cvs and compiles the spec test with it. > >I came to the following preliminary findings: >1) In order of performance from low to high for Crafty we have: > GCC 2.95, 3.0, 3.1 > >2) Probably the fastest compiler for Crafty is not GCC 3.1. >On http://www.suse.de/~aj/SPEC/CINT/d-permanent/index.html > a compiler peaked above 600 once. I have no idea if this compiler did produce >valid results. > >3) The following GCC-flags seems work best for Crafty: > -O2 -march=athlon -fomit-frame-pointer > >4) On http://www.suse.de/~aj/SPEC/CINT/d-permanent/index.html it look likes the >performance goes down for Crafty each release Use the Intel compiler. GCC is simply no good if you can avoid it. Of course for 64 bit it is the only choice for the moment, but Intel should have 64 bit stuff ready soon...
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