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Subject: [OT] Ram s Cache latency

Author: Mathieu Pagé

Date: 23:02:32 02/20/04


Hi,

  Sorry for the out topic post but i searched for this on google and news groups
for some time now and I know some of you can answer me as it is something we
have to deal with while creating chess engines.

  Tonight I have change my type PIECE from an enum to a typedef chat PIECE with
some #defines for the differents pieces and I got a speed up of 37 % of my
engine while doing perft test.

  I thin that this is due to a better use of the cpu's cache. I was wondering
what is the ratio betwen cache and RAM latency. Is it as big as RAM VS HD
latency ?

Mathieu P.



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