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Subject: Re: Slow EGTBs

Author: David Rasmussen

Date: 12:41:16 01/16/03

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On January 16, 2003 at 15:25:19, Dieter Buerssner wrote:

>On January 16, 2003 at 13:31:39, David Rasmussen wrote:
>
>I have not read all the answers carefully, so sorry when I repeat some points.
>
>For me, OS cache seems to be more important, when heavily probing TBs than the
>Nalimov-Cache. Access in the Nalimov-Cache is of course faster, but more space
>(a major factor) is needed, to cache the same number of positions. So,
>especially in heavy TB-probing situations, it will be useful, if you have a big
>ammount of free RAM, that the OS can (and will) use for cache.
>

I only have 256MB RAM in this machine. That might be part of the problem. If
that is the problem, is there anyway to confirm it? I guess I could look at the
Windows Task Manager performance tab, and see how much cache is used, or
something.

>Another thing - don't install all TBs. If your engines has problems with missing
>promotion cases, you must be careful to select them. Don't define T41_INCLUDE.
>

What is T41_INCLUDE?
Also, I have _all_ 3-5 TBs, all 7.1GB of them. That's ok, isn't it? Also, I
don't understand what you mean by problems with missing promotion cases.

>Don'T forget to hash TB-positions. You can flag them somehow, so that they will
>be good for a cutoff at any depth.
>

I store them as exact with maximum draft. But maybe I will check later if I have
a bug that somehow causes these not to be stored, or not to produce a cutoff
when re-encountered.

/David



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