Author: Robert Hyatt
Date: 06:48:00 01/25/01
Go up one level in this thread
On January 25, 2001 at 02:32:01, Bernhard Bauer wrote: >On January 24, 2001 at 12:06:40, Robert Hyatt wrote: > >>On January 24, 2001 at 10:22:28, Bernhard Bauer wrote: >> >>>On January 24, 2001 at 06:51:30, David Rasmussen wrote: >>> >>>>I have a problem with Crafty. >>>> >>>>I'm trying to run it on a solaris system with 24 CPUs (I've tried it as well on >>>>a 12 CPU machine of the same kind). >>>> >>>>I sometimes get the message "ERROR. no SMP block can be allocated". >>>>What does this mean? What is the problem >>> >>>In chess.h is a line >>>#define MAX_BLOCKS 16*CPUS >>> >>>You may change this line to a greater value. >>>For CPUS=2 this did noz work for me, so I use >>>#define MAX_BLOCKS 128 >>>and that works. >>> >>>Kind regards >>>Bernhard >> >> >>When you say "did not work for me" do you mean you got the out of blocks >>error? 2*16 should work for a dual. 4*16 works for my quad and never >>produces an error. If you watch the SMP part of the statistics output, it >>shows the max number of blocks used during a search: >> >> SMP-> split=507 stop=83 data=17/64 cpu=22.77 elap=6.18 >> >>in my case, 17 blocks was the peak usage, with a total of 64 (4*16). I would >>definitely be interested to know your peak number for a dual system. I would >>expect something in the 8-10 range typically. On my quad it averages about 12 >>over the course of a game. > >Dear Mr. Hyatt, > >when I compiled Crafty 18.1 with makefile.nt under WIN2000 with the MS compiler >C/C++-Compiler, Version 12.00.8804 >Crafty compiled fine, no errors, but when I started the exe file I got an error >immediatly. So if you ask "did you got the out of blocks error?" I will say yes >or no, it simply didn't run. A window poped up which said I had a memory error. >So I had no idea what the error coud be. First when I noticed the change from >17.14 to 18.1 in chess.h I was able to compile Crafty for SMP. > >When I ran the LCT2 test for 30 min/pos I got a peak number of 10/128. > >Kind regards >Bernhard OK... two issues... 1. 10 blocks max seems about right for 2 cpus. since the default would be to have 32 (2*16) you should not have to change this. 2. if this fixed your crash (no other changes at all) then there is _another_ problem. Could you compile with 32 blocks and debugging enabled and run under the debugger to see where it is crashing? This has to either be an optimizing problem or a serious bug in Crafty itself. It would be nice to know which. Bob
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