Author: Robert Hyatt
Date: 06:23:00 12/01/97
Go up one level in this thread
On December 01, 1997 at 02:10:57, Jouni Uski wrote: >1) How fast would Crafty be in the fastest possible Cray available today >and how strong expect you it then play in comparison to Pcs and >Deep Blue? >2) Is there any plans to use Cray to run Crafty in future?? > >Thanks in advance Jouni Hi Jouni... (1) I really don't know. The fastest machine around right now is a 500mhz (2 nanosecond cycle time) T90, with 32 processors. With some work, crafty should probably be able to search around 500K nodes per second per processor, which would hit around 16M nodes per second overall. Factoring in the typical (for Cray Blitz) 75% efficiency that we got, this would be an effective speed of 12M nodes per second. Really nowhere near DB's speed, although it is not nearly so far away as Crafty (or any other program) on a micro, even a very fast alpha. I don't know how strong it would be. This is about 150X faster than Crafty on a P6/200. Figuring a conservative factor of 3X per ply (it is closer to 2-2.5) suggests this would be worth 4-5 plies of additional search depth. Probably more like 7-8 as a best guess. (2) not at present. One of the reasons I started to work on a PC-based chess engine was machine availability. Getting time on a Cray is difficult to impossible, when the machine sells for roughly 60 million dollars. So testing and tuning is really impossible. Thinking back, it is absolutely amazing how lucky we were over the years to win as many computer chess events as we won, because (except for very rare exceptions) the only games we ever played on a Cray were the games in the tournament we competed in. *not* a good way to develop a consistent program. You will probably see a parallel crafty before too much longer, one that will particularly scream on a parallel alpha. And this code would probably port to the Cray and run like the blazes, but getting machine time on a 16 cpu alpha is child's-play compared to getting machine time on a T90...
This page took 0.01 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.