Author: Robert Hyatt
Date: 07:12:11 12/25/03
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On December 25, 2003 at 04:55:44, Mridul Muralidharan wrote: >Hi all, > > I would like to know the list of MP engines that are currently active - >amateur , commercial , and private (not in-development efforts :) ) > >The list that I could come up with was : > >Baron (upto 2 or even higher ? ) >Brutus >Crafty >Diep >Fritz >Junior >Shredder >Sjeng >SOS (or is it ParSOS ?) > >Of these , which all can scale > 8 procs ? >Diep I know for sure. >SOS also I think. >What about rest ? Crafty certainly does, given the right kind of architecture. I've run it on 32-way boxes for example. > > >Of these which all are NUMA compatible. >Latest crafty , Diep. >Anyone else ? Be careful. There is NUMA and there is NUMA. Current Crafty supports NUMA under windows, which pretty well limits it to Intel and AMD machines. Diep is running on SGI, which is not particularly compatible with anybody else. I have an experimental NUMA version of Crafty, but it is not well-checked out yet (it is a linux version using libnuma for the NUMA stuff, but linux kernels are very spotty in their NUMA support to date.) Eventually Crafty will support NUMA on linux and windows. Others may be added if time permits and hardware becomes available for testing. > >Can anyone provide with what is the usual speedup on a Quad for these engines - >say a typical middle game position ? My formula for speedup is this: speedup = 1 + (ncpus - 1) * .7 IE for a quad, that gives 3.1x which is a pretty good approximation. >(In case you need a machine config to base numbers on - what about a Quad Xeon 3 >GHz 3 Gig RAM running OS of your choice). CPU speed really doesn't matter so long as there are no hardware bottlenecks to deal with. IE my formula above works just as well on my quad pentium-pro 200 as it does on my quad xeon 700 and my dual xeon (with hyperthreading on) 2.8ghz. It also fit the quad opteron 2ghz machine just fine also. > > >Thanks in advance >Mridul
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