Author: Thomas Mayer
Date: 23:57:06 01/03/02
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Hi Ed, > RAM is normally not the limiting factor when using EGTBs. Typically, 4096 KB > is allocated to the EGTB cache. More important is that you have enough > harddisk space to store the EGTBs.... the complete 3/4/5-man EGTBs take up > 7.05 GB. But since you state that you already have them, I assume this isn't > a problem. that is not the complete truth... The engine needs also up to 40 MBs of RAM for extracting to compressed files. This might be even more when using 6-men tablebases... This is very important to know if you start eng-eng matches. You might have 384 MB and want to give each engine 128 MB hash and 4 MB egtb-cache... so we have 132 MB each for this tables... But now we must add 40 MB to each one because of the extracting... so we have 172 MB for each engine, we have two engines, so we will need 344 MB... if our machine has only 384 MB this could already be a problem... (OS, file caches, GUI, etc.) My numbers for eng-eng-tourneys (asuming that winboard is used) RAM Hash used TBs Cache 64 MB 8 MB none none 128 MB 16 MB 4-stone 1 MB 256 MB 32 MB 5-stone 4 MB 384 MB 64 MB 5-stone 8 MB 512 MB 128 MB 5-stone 16 MB 1024 MB 256+MB 5-stone 16 MB add: to me, higher TB-Caches then 16 MB does not make any sense, because a bigger filecache seems to be more helpful here... also the usage of 6-stone EGTBs doesn't seem to be a win in most cases... it seems that most of the programmers have the same opinion than I, like Bob Hyatt is not using the 6-stones with Crafty. For analysis they might be useful, but not for game play at the moment. Greets, Thomas
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