Author: Eugene Nalimov
Date: 10:15:02 10/24/04
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On October 24, 2004 at 11:54:32, Robert Hyatt wrote: >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... It already has. http://www.intel.com/software/products/ Thanks, Eugene
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