On Tuesday 19 July 2005 20:40, Jeff Gilchrist wrote: > > Now I wonder how it works if you have a dual CPU machine with > dual-core processors and hyperthreading?
What's the difference between this setup and a 4-cpu unicore system with hyperthreading? (Apart from any esoteric numbering which is a function of a semi-broken operating system) > > 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 _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
