Author: Jeremiah Penery
Date: 21:15:32 09/02/03
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On September 02, 2003 at 22:46:28, Robert Hyatt wrote: >On September 02, 2003 at 18:26:44, Jeremiah Penery wrote: > >>All I said is that being SMP doesn't magically make your latency better. It >>depends on how the machine is built. There's no reason a big NUMA machine >>couldn't be built where the average memory access wouldn't be as fast or faster >>than a similar-sized SMP machine. There are several reasons why such a machine >>isn't built, but not a real technical reason. > > >The reason is $. NUMA scales well with respect to price per additional CPU. >Crossbars to not. It is possible to build a NUMA box that switches just as >fast as a Crossbar. There's no reason to do so, because you end up with a >crossbar, and its associated high scaling cost. Exactly. :) As I've said, there's nothing that magically makes SMP *inherently* faster than NUMA. Nothing more.
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