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Subject: Re: Shared Hash Table - How to Test?

Author: Bob Durrett

Date: 15:17:48 07/22/03

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On July 22, 2003 at 17:43:03, Matthew Hull wrote:

>On July 22, 2003 at 17:27:37, Bob Durrett wrote:
>
>>
>>While using Chessbase 8, I use an analysis engine.  Until today, that analysis
>>engine has been Fritz 8.  Today I purchased Shredder 7 and ran Chessbase 8 using
>>Shredder 7 as the analysis engine.  After allowing the analysis engine to look
>>at a position for a few minutes, I copied the Shredder line to the notation and
>>then switched to Fritz 8.  The question I have is whether or not the contents of
>>the hash table used by Shredder would then be used by Fritz.  The first thought
>>would be that switching engines would erase the Shredder hash table(s) and set
>>up new empty Fritz hash table(s).  But does it have to be that way?
>
>
>The hash table is part of the program's memory address space.  Each program has
>it's own address space.  There is no sharing of this space between chess
>engines.  Most modern operating systems take care that one address space does
>not access another program's address space, as this would defeat the goals of
>system stability and program reliability in spectacular ways.
>
>Regards,
>Matt

Thanks.

Bob D.


>
>
>>
>>Is there some simple test a user could perform to determine whether or not the
>>two engines would use the same hash table where the contents put in by one
>>engine would then be used by the other?
>>
>>Does this make any sense?
>>
>>Bob D.



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