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Subject: hash---what is really going on in ram

Author: K. Burcham

Date: 21:51:02 03/13/01


ok so i boot up, start my program. set my hash to 128, with 384 megs of ram, and
i start playing. when i start out the % of hash reads 0, and will climb to about
50% in 30 seconds. does this mean that one stick of ram is at this point half
full of positions considered? if yes, then after every move why does this
percentage go back to 0. does this mean the ram clears after every move? what is
this 50% referring to?  what is the 0% of hash, after every move  referring to?
also i have noticed how fast sos and shredder5 will fill hash. i can see why
stefan always had a very large amount of hash in his tournaments, 768 megs. what
are these programs doing in a long analysis, or in an all nighter? does this
hash fill, and it just starts a read/write from the hard drive? or does the
operating system constantly move these calulations to the hard drive to clear
hash?  if yes, then during this file moving, from ram to hard drive, can we say
that the program never "thinks" to the hard drive (excluding tablebases), and
only thinks (stores nodes) to  ram?

thanks      xracer



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