Author: Andrew Williams
Date: 12:45:49 02/16/05
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On February 16, 2005 at 15:11:13, Frank Phillips wrote: >On February 16, 2005 at 14:27:49, Andrew Williams wrote: > >>On February 16, 2005 at 13:09:14, Frank Phillips wrote: >> >>>Has anybody got any experience with g++ 3.4 for amd64 (x86_64) - for Linux? >>> >>>I have been using the profile generated optimisation option, but the code it >>>produces is no faster then with simple -O3. >>> >>>I simply compile with -fprofile-generate >>>then run, >> >>What do you run? > >My chess program (searcher). I have a mode for calcuating to fixed depth, which >I often use to check that the total have not changed after making changes to the >program that should not affect the tree. Not an extensive test suite, but I >expected to see some difference. > >Frank > Is this several positions? How long do you run it for? I'm using gcc 3.3.5 at the moment, and I'd expect at least a 10% speedup as a result of using profiling. I might use 10 positions and run them for about 2 minutes each. Andrew >> >>>then recompile with -fprofile-use. >>> >>>The relevant *.gcno, *.gcda files are produced. Must be doing something >>>wrong..... >>> >>>Frank >> >>Andrew
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