Author: James Robertson
Date: 19:38:36 07/19/99
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On July 19, 1999 at 22:28:26, Jon Dart wrote: How did you get the profiler to work? I have had perennial problems trying to make it work.... James >I don't think the compiler options are at fault. > >I built it with Visual C++, using the standard "Maximize >Speed" optimizations and then ran the Visual C++ profiler. > >Like many chess programs, it is spending most of its time >in the evaluation function, but it appears that the pawn >evaluation code is a particular bottleneck. You could make >it faster by using a pawn structure hashtable. > >Also note that it's spending 24% of its time in the >in_check function (and the functions it calls). Speedups >here would help, too. You might get some speedup just >by caching the in_check status, since it looks like >you're calling it at least twice per node. > >Following are the profile results: > > Func Func+Child Hit > Time % Time % Count Function >--------------------------------------------------------- > 2448.838 22.9 4545.522 42.5 170169 _eval (eval.obj) > 1865.044 17.4 1865.044 17.4 467679 _attack (board.obj) > 969.700 9.1 969.700 9.1 1288829 _eval_dark_pawn (eval.obj) > 876.467 8.2 876.467 8.2 1286777 _eval_light_pawn (eval.obj) > 829.162 7.8 829.178 7.8 1173451 _gen_push (board.obj) > 780.202 7.3 1536.612 14.4 33106 _gen (board.obj) > 750.416 7.0 2615.278 24.5 467633 _in_check (board.obj) > 500.408 4.7 573.162 5.4 85750 _gen_caps (board.obj) > 451.960 4.2 8023.462 75.0 178056 _quiesce (search.obj) > 366.498 3.4 10695.191 100.0 117733 _search (search.obj) > 282.461 2.6 1748.383 16.3 264338 _makemove (board.obj) > 180.133 1.7 180.133 1.7 264337 _sort (search.obj) > 143.457 1.3 143.457 1.3 254698 _takeback (board.obj) > 126.716 1.2 126.716 1.2 170145 _eval_dark_king (eval.obj) > 123.800 1.2 123.800 1.2 170132 _eval_light_king (eval.obj) > 0.418 0.0 10695.609 100.0 1 _think (search.obj) > 0.220 0.0 10696.029 100.0 1 _main (main.obj) > 0.094 0.0 0.094 0.0 1 _init (board.obj) > 0.017 0.0 0.017 0.0 28 _gen_promote (board.obj) > 0.017 0.0 0.017 0.0 22 _sort_pv (search.obj)
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