Author: Andreas St.
Date: 07:59:40 12/08/00
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On December 08, 2000 at 10:02:46, William Penn wrote: >On December 08, 2000 at 07:15:47, Harpo wrote: > >>How does one enlarge the hash tables in CM6K? I've decided to skip the latest >>incarnation of the program, but I would like to tweak this one. When running it >>on a P3 450, 128Mb's RAM, what is a good sized table for long tournament games? >> >>I'm also curious about different opening books. Is there any consensus on the >>best alternatives to the main one? >> >>Thanks, >> >>Harpo > > >Edit the cm.ini file with an editor such as Notepad. Change the value of >ttable_size= according to how much hash you want, which must be in multiples of >2. I have mine set to ttable_size=26 which gives 64MB hash. Increasing by one >doubles the hash size, decreasing by one cuts it in half. For example >ttable_size=27 would be 128MB hash, ttable_size=25 would be 32MB hash. It must >be somewhat less than your available RAM because your op system needs some RAM >too (probably at least 32MB). If you have selected too much hash, your hard >drive will grind constantly and not stop. It's normal for it to grind for a >minute or so if you are near the limit, but then it should stop with only an >occasional click. > > ttable_size=19 hash 0.5MB > ttable_size=20 hash 1MB (default) > ttable_size=21 hash 2MB > ttable_size=22 hash 4MB > ttable_size=23 hash 8MB > ttable_size=24 hash 16MB > ttable_size=25 hash 32MB > ttable_size=26 hash 64MB > ttable_size=27 hash 128MB > ttable_size=28 hash 256MB > >Use as much hash size as your available RAM allows. With your 128MB RAM, 64MB >hash is the most you can use, and that's a good size for longer time controls. >At fast time controls the default 1MB is probably as good as any. Generally >increasing the hash size doesn't cause a big increase in speed, usually only >about 10%-20%. I'm told it can have larger effects in simple endgames at higher >ply levels but haven't tested it. > >I believe the mentor opening book is the biggest, but have no special knowledge >about opening books. I don't use opening books anymore, so don't have a reason >to explore it further. >WP Hi, Generally ...increasing the hash size doesn't cause a big increase in speed, usually only about 10%-20%. I'm told it can have larger effects in simple endgames at higher... That isnt right. I ve checked the differences between CM 6000 and CM 7000, which has a bug and uses only 1MB hashtables, and in many positions CM with 64 mb hash CM finds often very faster the right move. I ve seen, that 64 MB hash is the best. I use it in every time controls, certainly on fast hardware. And remember, use the CM 6555 settings! Greets AS
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