Author: Gian-Carlo Pascutto
Date: 10:12:34 09/03/03
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On September 03, 2003 at 12:05:43, Robert Hyatt wrote: >>As I've said, there's nothing that magically makes SMP *inherently* faster >>than NUMA. Nothing more. > > >That's not what I said. SMP _is_ inherently faster. Because all memory has >the same access latency. You _do_ have to share _something_ in a parallel >algorithm. ANd whatever that is will be slower than doing the same thing on >a SMP box. Even if it is just one word, the SMP box will access that one >word faster all around and the program will run faster. > >Perhaps not a lot faster for 1 word of shared data. But faster nonetheless. I don't understand. Even the slowest access on a NUMA Opeteron is twice as fast as on a SMP Xeon. How can it be slower then? -- GCP
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