Author: Robert Hyatt
Date: 15:30:42 03/07/00
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On March 07, 2000 at 15:21:19, Dann Corbit wrote: >On March 07, 2000 at 15:04:26, Dikmen wrote: > >>Hello everybody >> >>I have a 8 cpu server at work.I want to test Deep Junior and Crafty on it. >> >>But I have a question.Can anybody tell how many cpus does this prgrams support. >> >>Does they work under 8 cpus or they are limited to 4 cpus? > >Don't know for sure about Deep Junior, but crafty needs to be compiled for 8 >CPU's or more. The CraftySMP at my ftp site is compiled for up to 256 CPU's Not exactly, unless you changed MAX_BLOCKS in chess.h. This algorithm requires at _least_ one split block per cpu. For 4 cpus, I use 64 for MAX_BLOCKS. I would suggest at least 1024 for 256 cpus and that is probably low. The problem is that a block gets used to split the tree, and copied to clone blocks for each thread. And this happens recursively, which means many such blocks are needed. With CPUS> 64 there is no way to get them busy as no split blocks will be available..
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