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Subject: Re: Hash hit != Hash full

Author: Robert Allgeuer

Date: 09:19:02 06/19/04

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On June 19, 2004 at 12:11:12, Andreas Herrmann wrote:

>On June 19, 2004 at 11:59:31, Gian-Carlo Pascutto wrote:
>
>>On June 19, 2004 at 11:40:54, Andreas Herrmann wrote:
>>
>>>At first you can't compare the values, because AFAIK there is no definition
>>>inside the UCI protocol, what to output there. So only the author of an engine
>>>knows, what he sends there to the GUI.
>>
>>* hashfull <x>
>>the hash is x permill full, the engine should send this info regularly
>>
>>Hash hits are not the same as the hash being full. You can have a full
>>hash and still get no hits.
>>
>>--
>>GCP
>
>please read my posting carefully. I'm speaking from "hash fill rate", and not
>from hash hit rate. And there is no hit rate output inside the UCI protocol. I
>think the orginal poster, just mismatched that.
>
>Andreas

Yes, I confused the two. But how would an engine measure how full its hash
tables are; looks difficult to me? Furthermore this would mean that in most
engines - as they do not clear hashtables after each move - this value would
have to approach 100% during the course of a game, which I did not observe for a
single engine so far.

Robert



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