Author: Johan de Koning
Date: 19:21:39 01/24/04
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On January 23, 2004 at 15:14:04, Rajen Gupta wrote: >hi johan: > >i have a pentium 3, 1.2 ghz with 512 mb ram > >i normally use just below half of this as hash for chessbase engines at long >time controls. > >as per your previous suggestion (through indirect sources) i have come to >believe that 64 mb is optimum for the king3.23 (running as a UCI engine in the >chessbase interface. Because clearing the TT takes some time, there used to be a problem with huge TT *and* fast time controls. However, the clearing has been optimised as of TK 3.12d (CM8000 final patch, summer 2001), and the problem is non-existant since then. Well, there is still the fact that random RAM access slows down with increasing size. But that's a complicated hardware issue that applies to all engines. Depending on the machine and the engine it will be just noticeable or just not. >is this correct or should i use a higher figure? Can? Yes, no problem. Should? No, only for loooong time controls. My rule of thumb for The King (being a slow searcher) is to allocate 1 byte per *average* node searched. That's simply enough. Example1 PIII/1200 does 150 kN/s Time control game/10 minutes does 10 seconds on average. TT = 1.5 MB does the job. Example2 AMD 3000+ does 400 kN/s Overnight analysis takes e.g 36 ks TT = 1 GB is smallish, but hey, there are limits! ... Johan
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