Author: Robert Hyatt
Date: 08:03:03 09/02/03
Go up one level in this thread
On September 02, 2003 at 02:34:42, Bo Persson wrote: >On September 02, 2003 at 00:14:02, Jeremiah Penery wrote: > >>On September 01, 2003 at 23:23:18, Robert Hyatt wrote: >> >>>On September 01, 2003 at 09:39:55, Jeremiah Penery wrote: >>> >>>>Any large (multi-node) SMP machine will have the same problem as NUMA with >>>>respect to inter-node latency. SMP doesn't magically make node-to-node >>>>communication any faster. >>> >>>Actually it does. SMP means symmetric. >>> >>>NUMA is _not_ symmetric. >> >>Of course. The acronym means "non uniform memory access". >> >>But if you think "symmetric" necessarily means "faster", maybe you'd better look >>in a dictionary. > >No, but it means "equally fast". :-) > >The problem with NUMA is that, to the processor, memory speed depends on the >memory address, which most programs don't take into account. > > >Bo Persson It is actually difficult to do that. Even worse is the case where a process bounces from one CPU to another. Now things _really_ get ugly.
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