Author: Anthony Cozzie
Date: 15:59:13 03/27/03
Go up one level in this thread
On March 27, 2003 at 17:20:02, Aaron Gordon wrote: >The two main things you want to do is get a processor that is as fast as >possible and with longer time controls use a hash table that is as big as >possible. With 512mb try not to go above 384mb hash, any more and it'll >definitely swap. 320mb is pretty safe to use. With 256mb ram 160mb hash is >probably going to be your max. > >As far as speed goes.. if you use a very large hash table you can generally >(depending on the chess engine) expect to see a 2-10% increase in nodes per >second by doubling your ram speed (going from SDR to DDR for example). If you >use smaller hash tables (less than 32mb or so) you'll see no measurable >difference. If you use 32mb hash vs 320mb hash w/ 512mb ram you'll generally see >a slight drop in nodes per second. This is fine, though, because in long time >controls a larger hash is much, much better. > >So far I have noticed with Fritz 5.32 set to 255mb hash gets filled entirely in >about 1 minute at 2.5 million nodes/second on my AthlonXP 2.5GHz. >On FICS I use the computer account "LittleGoliath". For lightning games I use >192mb hash, for short blitz games (3 0 to 4 1) I use 256mb hash, for blitz over >5 1 I use 320mb hash and for standard games I use 384mb hash. > >Since your P4-1.8GHz is about the speed of an Athlon 1.2GHz it'd be wise to use >about half of the hash I'm using except for long time controls. So, for your >P4-1.8.. 96mb hash for lightning, 128mb for short blitz, 160mb for longer blitz >and 384mb (or 320mb to ensure no swapping happens) for long time controls would >probably be best. Just uset these hash sizes to start out with. You could get >better results by experimenting with various sizes.. I wouldn't go below those >settings much though. One of the nice things about a larger table is that there are fewer collisions. anthony
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