Author: Steve Maughan
Date: 06:16:40 06/09/05
Go up one level in this thread
Tord, >In fact, it is very likely that it does. When thinking for several minutes, >big hash tables help a lot for Glaurung. Here are the times needed to find >mate in 15 and 14 from this position on my iMac G5 1.8 GHz with various hash >table sizes: > >-----------+---------------+---------------+---------------+---------------+ >Hash | 32 MB | 64 MB | 128 MB | 256 MB | >-----------+---------------+---------------+---------------+---------------+ >Mate in 15 | 8:20,15 plies | 6:01,15 plies | 3:05,15 plies | * | >Mate in 14 |10:18,16 plies | 8:17,16 plies | 4:02,16 plies | 2:15,15 plies | >-----------+---------------+---------------+---------------+---------------+ > >As you can see, from 64 MB to 256 MB each doubling of hash table size reduces >the time by a factor of about 2. I'm amazed - I didn't think that the hash would play such a big roll in a middle game position. I guess it could be IID when there is a significant fail high - just a thought. Regards, Steve
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