Author: Dann Corbit
Date: 14:40:51 09/17/04
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On September 17, 2004 at 17:09:04, Robert Hyatt wrote: >On September 17, 2004 at 14:05:10, Dann Corbit wrote: > >>There is a memory leak somewhere (maybe in the tablebase code?) >>After letting Crafty run all night analyzing WAC at 3 minutes per position with >>494 megs ram allocated (14M tablebase, 384M hash, 96 pawn hash) Windows task >>manager indicated a peak physical memory usage of 800MB and a virtual memory >>size of 2,090,964K = 2GB. >> >>Crafty solved 299/300 on WAC, but some strange things surfaced. The one problem >>not solved was NOT one of the few difficult ones like WAC.230, WAC.141 but was >>instead WAC.274. Also, in the log file, we see a couple "captured a king" >>messages. > >This indicates a serious problem. Often caused by bugs as I am testing, but for >released versions, most commonly they are caused by compiler optimizer bugs >instead. > >19.17 has been running and has played several hundred games, plus a lot of long >testing on the 4-way opteron before AMD zapped it to use for another project. >In looking at all the log files, I _never_ see that error message... > >I tried wac274 and get Rg2 from ply 2 on, with the score climbing each >iteration. Something looks broken there... IE what compiler version, options, >etc?? It's a beta compiler, so quite likely, that is where the problem is coming from. Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.40607.16 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. These are the exact compiler flags: /Ox /Og /Ob2 /Oi /Ot /Oy /GT /GL /I "c:\program files\Microsoft SDK\Include" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "WINDOWS" /D "EGTB6" /D "NT_i386" /D "FAST" /D "VC_INLINE_ASM" /D "DETECTDRAW" /D "EPD" /D "USE_ASSEMBLY" /D "_MBCS" /GF /FD /MT /Zp16 /Gy /fp:fast /Fp"Release/crafty.pch" /Fo".\Release/" /Fd".\Release/" /W4 /nologo /c /Gr In debug mode, the position solves correctly, so it may be related to a bad optimization. The other positions all analyze fine (debug or release).
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