Author: Keith Evans
Date: 16:03:56 03/05/04
Go up one level in this thread
On March 05, 2004 at 08:51:27, Vincent Diepeveen wrote: >On March 05, 2004 at 08:47:24, Vincent Diepeveen wrote: > >>On March 04, 2004 at 13:28:53, Keith Evans wrote: >> >>>On March 04, 2004 at 12:42:24, Vincent Diepeveen wrote: >>> >>>>On March 04, 2004 at 09:44:00, Bryan Hofmann wrote: >>>> >>>>>On March 03, 2004 at 21:29:39, David B wrote: >>>>> >>>>>>I have a Tyan 2885 currently not sure if its a bios setting or just an OS >>>>>>setting within Windows 2003 Enterprise Edition though its supposed to support >>>>>>numa which to the life of me I can not get it to do. Each processor currently >>>>>>is running 1gig of ram with Opteron 244's >>>>>> >>>>>>Thanks >>>>> >>>>>I recommend reading the following; >>>>> >>>>>http://www.tyan.com/support/html/f_s2885.html >>>> >>>>David, >>>> >>>>Except for DIEP which has NUMA versions, and SOS which is multiprocessing too, >>>>but heavily relying upon shared memory, which program do you plan to run that >>>>profits from a NUMA machine setup? >>>> >>>>Nevertheless in your manual from your tyan mainboard you can find how to get >>>>numa to work. If i remember well the best thing to do is just fill up all memory >>>>banks with memory. That's the best way to do it always. >>> >>>I understand that Crafty supports NUMA under Windows. >> >>All crafty does do is put a thread to a specific cpu. Though that is important >>condition to run NUMA, it doesn't mean that all other stuff you need for NUMA >>gets used. >> >>It's multithreading of course, so it's completely SMP in that respect. >> >>I've already explained it a dozen times here. Bob just claims it's NUMA, but he >>has not even written the code himself, so he doesn't even know what he talks >>about. >> >>I claim the dual opteron platform to be a better SMP platform than dual P4 Xeon >>or dual K7. That it is NUMA too is just good for those who support NUMA. Crafty >>in itself will NOT run at NUMA hardware like Origin3800 or Altix3000. >> >>There NUMA means the random latency from this processors memory to other >>processors memory is *significant* slower than that of the SMP machines. >> >>So crafty is not NUMA at all. It doesn't run on NUMA machines other than the >>only NUMA machine where SMP is faster than SMP at others. >> >>Best regards, >>Vincent > >To run very well at a 8 processor Xeon, you need to be multiprocessor. >So shredder all multithreading thoughts in advance. > >Diep runs well at 8 processor Xeon. SOS runs well. > >Crafty,Shredder,Fritz (the commercial version),Junior they run very bad at that >hardware. > >Simply because they are multithreading. > >As Nalimov has shown you can in theory handicap multithreading to a form that it >is more looking like multiprocessing than multithreading. > >That's not how it gets used in practice and sure not by crafty like that. You >simply *need* to be multiprocessor. The poster was asking about an Opteron system. I think that we all know how well Crafty runs on a quad Opteron system from CCT6.
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.