Author: Andrew Williams
Date: 13:10:49 02/16/05
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On February 16, 2005 at 16:05:37, Frank Phillips wrote: >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. > > Ah. I see. I haven't tried 3.4.x yet, and I was planning at some point to install it and test it out. I'm glad I haven't tried it yet! Andrew
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