arm9
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Re:Optimum settings for Fritz7 - 2006/08/11 23:08
The idea was ok in the past, when hash tables were deleted before each move. I don`t know which current engines still do that (I guess The King, not sure).
Fritz 5.32 usually needed ~1.100... CPU cycles *per position* (tested in the starting position), Fritz 7.0.0.7 needs ~2.100. Which means, it evaluates (roughly) 500 nodes per Megahertz and second, Fritz 5.32 did ~900 nodes per MHz and sec. Which would mean, the above formula gives 2 Kilobytes for 500...900 nodes each, which is AFAIK ok. Also, there are engines which have a much smaller node rate, i.e. King or Hiarcs.
But as mentioned, hash usually isn`t deleted anymore, so the real limit which makes sense is your available free RAM anyway. Actually, it will be set to even less for most systems than the formula suggests, for one move of a tournament time game i.e. on a 1.5 GHz PC:
2.0 * 1.500 * 180 = 540.000, IOW it suggests to configure a hash size of 512 MB...
OTOH there are powerusers who have Gigabytes available. I remember one guy bitterly complaining that the program didn`t allow him to set *tablebase cache* to 512 Megabytes... :o))
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