Author: Sven Reichard
Date: 03:01:33 12/10/03
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On December 10, 2003 at 04:42:10, Russell Reagan wrote: >On December 10, 2003 at 02:50:45, Tony Werten wrote: > >>On December 09, 2003 at 10:29:00, Albert Bertilsson wrote: >> >>>Hi! >>> >>>I've finally got around verifying perft(10) from the starting position and it >>>is: 69352859712417, that is 69*10^12 nodes. >>> >>>It took 85 hours for my four computers to calculate it. If some people has a >>>couple of spare cpu cycles perft(11) would be no mayor problem to calculate. >> >>That's over 226 Mn/s. Quite high. > > >Wow. It sure is. Even for 4 computers working on it. The fastest public perft >calculator that I know of is Movei, which calculates at about 15 Mnps on my >Athlon 2400+ (which is faster than any of the hardware mentioned). I have heard >that a private version of Yace is faster. Even if Yace is twice as fast, running >on four Athlon 2400+'s (which would be faster than the mentioned hardware), we >are still only at 120 Mnps. Only two of the computers were running 24/7 too. >With a generous estimate of about 7GHz of the total number of cycles executed >between all four machines per second (and assuming they were running 24/7), >we're looking at about 40 cycles per node. That is a lot of asumptions, and we >are still 100 Mnps short. > >So that's either very impressive, or something is wrong :) > Correct me if I'm wrong, but since the word "hash" is used below, I assume that hash tables are used; thus maybe the search was not done "honestly". If for each node we store the number of children in a hash table, we can save a lot of work if we revisit a node. Sven. > >>Tony >> >>> >>>Hardware used: >>>XP2100+ (256MB hash) >>>XP1700+ (128MB hash) (not working on the problem 24/7) >>>Celeron 800 (128MB hash) (not contributing very much =)) >>>P4 2GHz (256MB hash) (not working on the problem 24/7) >>> >>>/Regards Albert
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