Author: Robert Hyatt
Date: 10:24:08 09/18/03
Go up one level in this thread
On September 18, 2003 at 11:58:53, Vincent Diepeveen wrote: >On September 18, 2003 at 11:53:11, Robert Hyatt wrote: > >>On September 18, 2003 at 11:14:09, Vincent Diepeveen wrote: >> >>>On September 18, 2003 at 11:06:13, Robert Hyatt wrote: >>> >>>>On September 18, 2003 at 03:50:11, Gian-Carlo Pascutto wrote: >>>> >>>>>On September 17, 2003 at 16:03:09, Robert Hyatt wrote: >>>>> >>>>>>On September 17, 2003 at 14:54:41, Vincent Diepeveen wrote: >>>>>> >>>>>>>On September 17, 2003 at 14:47:49, Robert Hyatt wrote: >>>>>>> >>>>>>>lower clocked opterons are like $300, so i am pretty sure there is a big demand >>>>>>>already. >>>>>> >>>>>>No there isn't, because for single and dual machines, the NUMA issue can >>>>>>pretty well be ignored >>>>> >>>>>Ignored? You _will_ get a performance handicap if you do so. >>>>> >>>>>-- >>>>>GCP >>>> >>>>Yes, but on a dual it is a _minimal_ handicap. >>> >>>You only going to run Crafty dual? >>> >>>Best regards, >>>Vincent >> >> >>Any remote chance you will ever join a conversation and make any >>sense? > >You say you have nothing to do with NUMA, but on the other hand say also crafty >will run on more than 1 node. Where do I say that? I said "Crafty has not been optimized for NUMA yet." Nothing more, nothing less. Crafty _will_ run on a dual NUMA with little trouble. It won't be as fast as it could be but it will definitely run and produce reasonable results. Beyond 2, it needs some changes that are understood, and which have been done successfully in the past. > >Or do i make up from this all that you only will run dual because each node is a >dual NUMA? I suppose you can "make up" from this whatever you want... > >Further i hope you realize that the speed of 100Mhz RAM at quad xeon 700Mhz box >is relatively faster than memory at a 2.2Ghz opteron box, even though local >memory there is 2 times faster than at a dual P4 Xeon box you got now. > >So not taking that NUMA issue serious is a typical Hyatt viewpoint. Who said I don't take it seriously? I simply said "on a dual, the NUMA issues are nowhere near as important as they are on a larger machine, 32-way as an example." That's all I said. Anything else is just your imagination... > >As you can see from specint, with just 2.6MB working set at the big processors >with a lot of L2 cache, you already need > 10% system time to the slow RAM at >very slow processors a few years ago. > >Nowadays top processors are way faster so it is trivial that NUMA issues will be >at least > 10% of your worry. 10% is temporarily ignorable. 99% would not be. that was my point. For duals, the issues are less critical. > >Best regards, >Vincent
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