Author: Robert Hyatt
Date: 17:55:38 03/05/04
Go up one level in this thread
On March 05, 2004 at 19:19:36, Vincent Diepeveen wrote: >On March 05, 2004 at 19:03:56, Keith Evans wrote: > >>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. > >The reason for that is because the latency at quad opteron is better than >similar quad SMP systems. No it isn't, but don't let real facts get in the way of your bogus arguments...
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