Author: Dann Corbit
Date: 13:01:49 01/02/02
Go up one level in this thread
On January 02, 2002 at 15:54:41, David Rasmussen wrote: >On January 02, 2002 at 15:40:08, Dann Corbit wrote: > >>On January 02, 2002 at 15:34:55, David Rasmussen wrote: >> >>>I've tried running Crafty at my universitys multiprocessor machines, with poor >>>results. Using 4 processors was kind of ok, but not great (~750 knps), but using >>>many more processors (16, 24, etc.) just made it slower. How crummy is that. >> >>Did you do the compile with 96 processors enabled? It won't do that by default. >>I am pretty sure you need to change the define for CPUs like this: >>#define CPUS=96 >> >>Look at this in chess.h: >> >>#if !defined(CPUS) >># define CPUS 1 >>#endif >> >>I am guessing you will see (96/4) * 0.7 * 750K = ~12M NPS or so. > >I changed -DCPUS=4 to -DCPUS=16 in Makefile and put mt=16 in .craftyrc Hmmmm..... Does Ultra Sparc III have an interlocked exchange? I suspect that the makefile is defaulting to mutexes or something really icky like that.
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.