Author: George Speight
Date: 10:32:21 01/25/06
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On January 25, 2006 at 13:20:35, George Speight wrote: > >I got the info i gave you in the previous email from one of the resident >chessbase tech. experts in Germany. I told him the math that Steve Lopez quoted >in a chesbase article for deciding hashes didnt add up. He gave me the >following, which ws all i was really interested in. He said for a 5 min. game- >32mb hash. For a 30 or 40 min. game- 128mb hash. For longer time controls like >1hour or more - 256mb hash if you have the avail. hash. If you are running >engine-engine, never use more than half your avail. total hash for the total for >both engines. Of course 40 moves in 40 min. repeating would be- 128 mb also. For >really long time controls, use as much as you can get away with, without seeing >a fall off in nodes per second or hard drive ratcheting. Of course the above >hash settings he gave me may have been based on my giving him my processor >speed, which is 2.8ghz. You might want to contact him and discuss this with him. >His name is Hans and his email address is as follows: hans@schach.de He is a >nice man and should be able to help you, tho sometimes it will take him a few >days to get back to you. My personal guess based on what he gave me was that for >anything shorter than 5 min. i would set the hash on either 16 or 32 mb. I dont >think it will make a hell of a lot of diff. one way or the other. You have to >realize that when people bring up correct hash settings, you can almost never >get 2 to agree on much of anything. If it were me, i would stick with Hans >advice. Hope this is if some help. George Forgot to add this, if i were running a 10 or 15 min. game, I personally would leave the hash on 32, or possibly 64mb. Again, i really dont think that matters much. Either would more than likely be fine. Ole, who wrote the sigma program for the mac may have said it best when he told me that having a reasonable hash set was a lot more important than the actual setting itself. Regards, George
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