Author: Robert Hyatt
Date: 20:16:13 04/27/98
Go up one level in this thread
On April 27, 1998 at 18:41:55, Amir Ban wrote: >On April 27, 1998 at 16:30:34, Rajen Gupta wrote: > >>Dear Bob >> >>Which would be stronger-Crafty playing on a Single Pentium 400 MHZ >>System vs Crafty playing on a dual processor system consisting of 2 >>Pentium 200MMX(or Pentium Pro 200 x2)ie does a single processor system >>running at N megahertz play better chess than a dual processor system >>running on 2 xN/2 processors? >> >>rajen gupta > >That is trivially true. To see this, consider that the faster processor >can divide its time to simulate a two-processor algortihm. > >Practically, there is always significant waste of processor time when >doing parallel processing for alpha-beta. What is the best efficiency >achieved yet ? > >Amir So far as I know, probably Cray Blitz. It was almost 12X faster using a 16 processor machine... and that is hard to do. But given a choice of two PII/200 processors or 1 PII/400, I would likely take the PII/400, assuming memory and everything is not hosed up. It is *very* difficult to go 2x faster. The tests I have done on Crafty seem to show an average of 1.5X to 1.75X faster than one processor. 4 processors is around 3.25 X faster at present... However, when you think about it, there are some *interesting* boxes running around... I wouldn't think 10M nodes per second would be difficult at all... running on a big multiprocessor alpha like the Cray T3E... or even 2-3M nodes per second on a stock alpha multiprocessor...
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.