Author: blass uri
Date: 07:05:34 07/07/99
Go up one level in this thread
On July 07, 1999 at 06:24:23, Shep wrote:
>On July 06, 1999 at 11:28:18, Christopher A. Morgan wrote:
>
>>Hiarcs retains hashtable info between moves for future reference.
>>In Engine v. Engine in Fritx 5.32 (probably also in Hiarcs 7.32) I assume
>>after Hirac's move RAM (hashtable)is cleaned by Fritz for its move. In playing
>>around with various hashtable settings and time controls its fairly easy
>>to get Fritz to fill hashtables frequently (I have 64MB Ram on Pent II @ 266).
>>When that happens Fritz (apparently) goes to Win 98 dynamic swap file
>>on hard drive as hard drive lights up and makes "writing, accessing" noises.
>>After Fritz moves, Hiarc never accesses hard drive for its move. This
>>leads me to believe that Hiarcs "saved" hashtable on its previous move has
>>been deleted from RAM, and was never stored on the hard drive, so Hiarcs must
>>start from scratch. Right? (for my tests I use same hashtable size for both
>
>An easy way to find out if Hiarcs' hash table was cleared is the following:
>play an engine vs. engine match on a single CPU (thus PB disabled) and watch
>Hiarcs' depth counter when Fritz made a move which Hiarcs predicted correctly.
>If it shows something odd like "10/3" (i.e. full depth greater than selective
>depth), Hiarcs is accessing its saved hash table.
>If Hiarcs seems to count depth normally ("8/8 -> 8/21 -> 9/9 ..."), it does not
>use any saved information.
>
>And I think it has been mentioned on this board that Fritz clears its opponents'
>hash table every move, so I suppose there's no way to stop him from doing so.
>At least not in automatic eng-eng games.
I do not believe that Fritz clears Hiarcs7.32's hash tables every move because
Hiarcs7.32 had good results against Fritz5.32 in engine-engine games.
I did not do games Fritz-Hiarcs but in Junior-Hiarcs games I saw sometimes
things like 10/3 in Hiarcs depthes.
I know that chessbase claimed that Hiarcs7.32's hash tables are not cleared
every move and the problem is only of previous hiarcs engines.
Crafty16.6's hash tables also are not cleared every move and the problem was
only of previous crafty(mainly crafty15.xx).
Uri
Uri
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