Author: Frank Phillips
Date: 13:05:37 02/16/05
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On February 16, 2005 at 15:45:49, Andrew Williams wrote: >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 Six positions to fixed depth (10 ply in this case.). The kilonodes per second are exactly the same. There was a boost with gcc 3.3.? using -fprofile-arcs / -fbranch-probabilities in Mandrake 10.0 - about 10% IIRC. I am using Mandrake 10.1 at the moment, which has a later gcc. Frank > >>> >>>>then recompile with -fprofile-use. >>>> >>>>The relevant *.gcno, *.gcda files are produced. Must be doing something >>>>wrong..... >>>> >>>>Frank >>> >>>Andrew
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