Author: Robert Hyatt
Date: 07:41:01 05/05/01
Go up one level in this thread
On May 05, 2001 at 08:33:42, Uri Blass wrote: >On May 04, 2001 at 21:51:48, Robert Hyatt wrote: > >>On May 04, 2001 at 17:57:36, Jesper Antonsson wrote: >> >>>On May 04, 2001 at 14:48:14, Robert Hyatt wrote: >>>>My 60M figure is "peak". To compare that to DB you have to use 1000M nodes >>>>per second. It would _still_ be a long way away. >>> >>>Well, what I remember is that they reported around 400M nodes peak and 200M >>>nodes average. Anyway, a factor of 4-16 is not something I consider very much, >>>it isn't more than two to six years of Moores Law. :-) However, it is still an >>>open question how good DB was at evaluation. Those guys were smart and could >>>throw silicon at the eval terms, so it's possible that they had significantly >>>better eval than state-of-the-art chess software of today. On the other hand, >>>it's possible they didn't. >> >> >>If you do the math: 480 chess processors, 1/2 at 20mhz, 1/2 at 24mhz, you >>get an average of 22mhz, which at 10 clocks per node means an average of 2.2M >>nodes per second per processor. Times 480 and you get 1 billion. Peak of >>course, but it _could_ reach that peak. Hsu claimed his search was about 20% >>efficient which would take that to roughly 200M... >> >>On a 64 cpu alpha it is _possible_ that Crafty might exceed 60M nodes per >>second. But in reality it would be searching like a 40M node per second >>sequential processor due to the .3 efficiency loss for each processor. >> >>Still, it would be _very_ fast. Just not as fast as deep blue by quite a >>ways... And then there is the evaluation problem. I _know_ I don't do in my >>eval what they did in theirs as I would probably be another factor of 3-5 slower >>if I did... > >I still guess that your evaluation is better because you had many years to tune >your evaluation and they did not. > >Uri I might agree with "it is better tuned". But DB did a lot of things I can't do due to efficiency... So I am pretty sure that overall DB's eval would be much better...
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.