Author: Vincent Diepeveen
Date: 16:19:36 03/05/04
Go up one level in this thread
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.
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