Author: William Penn
Date: 10:19:16 10/11/03
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On October 11, 2003 at 03:57:57, Peter Stayne wrote: >Lately, I've been having Deep Fritz 7 analyze positions for long periods of time >(from 10-24 hours). I'm certainly going to up my RAM soon from 1GB to 2GB, and >was curious as to what, exactly, will be the benefits for chess programs in >these overlong sessions. > >I guess I'm mostly curious what a chess program does when it runs out of hash >space. Is there costly reorganization of the positions in the hash space to fit >new positions in? Or, once it's filled, does it just keep whatever's in there >and work completely from the CPU? Or does it depend on the engine? Would I >notice a speedup in reaching the higher ply numbers (20-ply+)? > >Thanks, > >Pete I don't have an answer for you, but am also curious to know more in this area, so will be watching for further responses. I'll just mention that I have 1GB RAM installed, maximum for my computer, and couldn't find any reliable (tested/proven) reference information about proper sizing or use of larger hash tables. So I devised some tests for 1-4 hour runtimes in Infinite Analysis mode, attempting to answer some of those basic questions about hash, but was unsuccessful. I was using the Shredder704.eng engine. The main problem was that I couldn't reproduce a particular "depth of search" nor the same (identical) line of analysis. Even if I ran it a particular test position twice using identical starting conditions and settings, it invariably produced different results. So no baseline was possible, nothing was comparable, and I quit trying. Perhaps your Deep Fritz engine gives more reproducible results so you could run your own tests(?). WP
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