Author: Chessfun
Date: 22:29:24 04/25/01
Go up one level in this thread
On April 26, 2001 at 00:34:05, Robert Hyatt wrote: >On April 26, 2001 at 00:01:15, Chessfun wrote: > >>On April 25, 2001 at 23:32:01, Robert Hyatt wrote: >> >>>On April 25, 2001 at 15:49:58, Frank Quisinsky wrote: >>> >>>>Hi there, >>>> >>>>I gave Crafty 2 CPUs, see the np/s from Chess Tiger. >>>>The games will be replayed. >>>> >>>>:-(( >>>>Frank live ... >>>>I forgot to adjust "Thread = 1" in the options from Crafty :-( >>>> >>>>Best >>>>Frank >>> >>> >>>Ugh.. if that is on a dual, it will kill my program. I get two threads >>>going, tiger has a third, and that is bad. It is quite possible that I >>>was searching nothing much at all in some cases. >>> >>>The problem is that one thread might be sitting on a spinlock and running >>>while the other thread is not executing due to Tiger. That is just wasting >>>the second cpu. Crafty's parallel search _absolutely_ must have 100% of all >>>the processors you use it on... or it will die horribly. >>> >>>It doesn't like 'shared machines' for the parallel search. _ever_. It isn't >>>harmful for the serial search of course. But for the parallel search, it is >>>awful. >> >>Frank has been running this CCE tourney for months. >>He is running it on a dual computer. >> >>This is not a SMP crafty as far as I know nor is it meant to be. >>All programs have identical hardware a single cpu. >> >>Sarah. > > >His previous post implied crafty was "trying" to use two threads. If it was, >the result is bad for several reasons. Tiger would get 1/2 of one CPU. But >then Crafty's SMP search would perform poorly. Random results for sure which >should be avoided... Exactly which is why he indicates he will replay the games. This is a CCE tournament match. From Group "A" which runs in the Fritz 6 gui. Therefore I assume he is using Crafty 18.08 from Chessbase. In the engine parameters there is a use processors box default is 1. Could be he changed it to do something else, then forgot to change it back when playing a CCE game. Sarah.
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.