[Beowulf] slightly [OT] smp boxes

Greg Lindahl lindahl at pbm.com
Fri Oct 17 15:50:55 EDT 2008


On Fri, Oct 17, 2008 at 01:28:46PM -0400, Prentice Bisbal wrote:

> Having a system with 8, 16, or 32 sockets does not necessarily equal
> SMP. Any Opteron based multiprocessor system is actually a NUMA system,
> since each Opteron has it's own memory controller on-chip and own bank
> of DIMMs.

Note that many people consider SMP to refer to symmetrical OS and not
symmetrical memory access, and thus NUMA is a subset of SMP. The Linux
kernel, for example, follows this definition... CONFIG_SMP=y is
required for CONFIG_NUMA to be set.

-- g
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