Author: Frank Quisinsky
Date: 03:44:14 04/26/01
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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. Hi Bob, since the latest Chess-Base "Native" versions of Crafty it is possible to set under Engine options "Thread = 1 or 2" on dual machines. Default = Thread 2 on Dual Machines. So I mus adjust Thread = 1 for Engine - Engine matches. Here I made a big mistake and forget to adjust Thread = 1 :-( Christian Koch see this (not enough np/s for Chess Tiger in the games where I have yesterday here posted). Sorry, I must replayed the games. BTW: Thanks to Chessfun for his comments. Best Frank
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