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Subject: Re: Slow EGTBs

Author: Scott Gasch

Date: 10:40:05 01/16/03

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On January 16, 2003 at 13:31:39, David Rasmussen wrote:

>I do more or less the same thing as everybody else, when probing EGTB's, judging
>from the open source programs I've inspected. But I get a severe drop in NPS
>when the tables are probed heavily. Much more than other programs, from what I
>can see on ICC.
>
>What could be the course of this?
>I have the same order of number of probes as other programs as I can see on ICC.
>So my limiting of probes is not the problem. I only probe in the first couple of
>plys and if there have just been a change of material on the board. The harddisk
>I use is very fast. It is a Western Digital 80GB 7200 RPM with 8MB cache. So
>that shouldn't be the problem either. I use NTFS, not FAT, I don't know if that
>makes a difference, or file systems in general. I haven't done any serious
>testing of this on EXT2, EXT3, ReiserFS etc. But as far as I know, people are
>able to do this on Windows, so I must be able to do it too.
>
>If you have any ideas on how to test or narrow down what's wrong, please post.
>
>/David

What did you set your EGTB cache size to?  Do you also store EGTB positions in
your main transposition table as exact scores with very high draft?

Scott



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