At 23:07 19/07/2005 +0000, Brian Beesley wrote:
> I'm guessing the CPU 0, 1, 2, 3 would be the physical processors and
> 4,5,6,7 would be the virtual ones but are the two cores on the same
> processor 0 and 1 or is it 0 and 2?
Does the answer to the last question really matter? Surely dual-processor
CPUs
are symmetrical? Unlike "extra CPUs" created by hyperthreading... What I mean
is (ignoring hyperthreading) if you have a dual-core CPU this behaves just
like a SMP capable mobo with 2 identical CPUs fitted. Except possibly for
licensing issues on those products where you pay extra per CPU - but that's
nothing to do with software architecture or performance.
Regards
Brian Beesley
For the purposes of Prime testing, dual-core processors behave exactly like
an SMP mobo with 2 CPUs fitted, however you only get half as much memory
bus bandwidth for each CPU, compared with a proper SMP mobo, so for
"real-world" compute-intensive applications performance can take a
substantial hammering. I've seen figures of over 50% idle on the second
core of a dual-core processor.
Alex.
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