Author: William Penn
Date: 09:24:26 02/16/06
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On February 15, 2006 at 21:43:54, Joseph Anthony Merolle wrote: >There is no need to test anything with the keep hash box checked my plys are >dirt low as 7-8 ply with k/ns dropping to 10 or lower depending on the engine of >course. Compared to an 18-22 ply now. Since clearing the hash, I am starting to >win games on playchess. My question still stands can I get my other engines to >does this or how can I get my hash to behave? I experienced something similar with Shredder 8 and tablebase access. As the endgame approached the nps dropped dramatically due to excessive tablebase access. That was largely fixed in Shredder 9. I don't see it with other UCI engines such as Fruit 2.1.1 or the Rybka betas. I was told that some people didn't have that problem so it was system-dependent. Those with faster hard drive access (such as SCSI drives, or whatever they're called) apparently didn't see this problem. So I suspect you have some kind of system-dependent issue. Here are some possibilities: --Are you using the Shredder 9 UCI engine, or the version which came on the CD from Chessbase? Try the other protocol. --System Restore on Windows XP. To test that theory, try turning it off temporarily. The workaround is to put your large databases, opening books, and tablebases on a separate hard drive or partition, excluded from System Restore. --Hash size. If it's too big your machine will be slow. To test that theory, lower your hash size to 50% or less of your available RAM. --Pagefile (virtual memory). I have mine on a separate hard drive in its own partition. This can help a little. Also check to see how it is setup. You should try the windows defaults, which may not be optimum but shouldn't cause the kind of problem you're seeing. In other words, if you have some kind of custom settings for the pagefile, that might cause it. --When the slowdown is happening look at the list of processes in Windows Task Manager (ctrl-alt-delete). Compare this with when the problem is not happening. It's possible you might discover the cause there, such as an extra unwanted process that's sucking up processor time. As for whether you can clear hash like that with other engines, I guess that depends on whether the engine provides that option. They're different. WP
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