Author: Matthew Hull
Date: 10:18:48 11/12/03
Go up one level in this thread
On November 12, 2003 at 12:18:22, Anthony Cozzie wrote: >On November 12, 2003 at 11:55:20, Gian-Carlo Pascutto wrote: > >>On November 11, 2003 at 23:42:45, Eugene Nalimov wrote: >> >>>My point is: it's possible that due to the fact that quad Opteron is NUMA -- >not SMP -- system, for SMP-only program performance on quad Opteron can be >>>worse than on *real* quad SMP system, even when for one CPU Opteron >>>performance is much better. Itanium was used only as an example of such >>>system, I never recommended rewriting any program for it. >> >>I don't understand how. The NUMA part is RAM. Even worst case on the Opteron >>RAM is faster than Xeon SMP. So how could it ever be worse? >> >>-- >>GCP > >Aaron's argument is: if a 1x opteron is faster than a 1x Xeon, a 4x opteron will >be faster than a 4x Xeon. > >Nalimov is saying that Fritz may scale worse on the opteron due to NUMA issues. >In other words, this is comparing latency with 1x opteron and NUMA opteron >relative to 1x Xeon vs SMP Xeon. > >Off hand this seems logical to me . . . Perhaps Eugene can tell us if SMP crafty was slower on 2x opteron than Bob's 2x Xeon, before the NUMA mods were made? MH > >anthony
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