Author: margolies,marc
Date: 20:48:32 04/29/04
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Hi! in the chessbase gui, there is a distinct setting for hash for the engine and hash for tablebase look-up. unless the user suffers from some kind of alloc problem due to paging from high hash settings, please tell me--because i don't understand this--why a high hash setting for the engine should have particular bearing on engine performance in the end game. Assuming that your suggestion rings true, I might guess this could be a problem of harddrive responsiveness from too many tablebase look-ups in PVs, but I am hoping that you have a clearer answer for me. Thanks!-Marc On April 29, 2004 at 23:07:21, William Penn wrote: >On April 29, 2004 at 19:33:29, John Conte, Jr. wrote: > >>According to Chessbase.com, your suppose to hear clicking for a while. >>I have a Compaq Presario AMD ATHLON XP PROCESSOR at 2.08GHz, with 80 GB HARD >>DRIVE, and 512 MB SDRAM memory. What I do hear is a sound like a fan. I am >>confused...please help. I realize the hash tables make a big difference in the >>program operating at peak performance and also Chessbase.com states if you have >>a greasy fast computer, never set the hash tables above (I forget but it was 75 >>or 85MB. Thanks! >> >>jack > >Hash tables make a difference, but don't overestimate their importance. The >tests I've run indicate they do NOT make a big difference - just an ordinary >one. > >You don't have a greasy fast computer, but it's a good one. The advice you read >about hash size sounds wrong for Infinite Analysis mode. It's OK to use 75-85MB >hash for speed chess or ordinary games, but in general Infinite Analysis mode >can use all of the hash possible. The more the better, usually. > >You can probably use up to about 384MB hash in Infinite Analysis mode if the >GUI's maximum allows. If the op system is sluggish and you're running Windows >XP, you can set the priority one notch lower via Task Manager for >ChessProgram8.exe by rightclicking that process. That will improve the op system >response and multitasking, and won't hurt engine speed significantly. However >you shouldn't try to do much multitasking with this large proportion of hash >(not much free RAM remaining) which could hang your system, or make it too slow >to be useful. > >Or you can probably use 256MB hash with no problems, except possibly when the >endgame approaches and if tablebase access becomes heavy with all 3-4-5 piece >files. Then it may be necessary to reduce hash size somewhat to keep a >reasonable engine speed. > >Let windows manage your pagefile size entirely. I've tried tweaking alternatives >and now believe that's best. > >As for the sound, I suppose they're talking about the pagefile spinup delay for >the allocated hash size. I'd forget about the clicking sound vs a fan noise >advice. It doesn't sound useful. Instead, keep an eye on your hard drive >activity light. It will be constantly active during the spinup, then subside. >You may not get any significant spinup delays (or sound) with 256MB hash or >less, but probably will with 384MB hash or more. It doesn't hurt anything in >Infinite Analysis mode to maximize your hash size, so long as the spinup stops >after awhile, sometimes taking several minutes. The engine speed will take off >when the hash size has been fully allocated in the pagefile, and the hard drive >activity light will subside. > >Good luck! >WP
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