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<blockquote>Serious programming challenges remain with this kind of architecture because it requires two distinct modes of programming; one for the CPUs themselves and one for the interconnect between the CPUs. A single programming language would have to be able to not only partition the workload, but also comprehend the memory locality, which is severe in a mesh-based architecture.<ref name="AutoMQ-1"/></blockquote>
SMP systems allow any processor to work on any task no matter where the data for that task is located in memory, provided that each task in the system is not in execution on two or more processors at the same time. With
==History==
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Early commercial Unix SMP implementations included the [[Sequent Computer Systems]] Balance 8000 (released in 1984) and Balance 21000 (released in 1986).<ref>{{Cite book |last1 = Hockney |first1 = R.W. |last2 = Jesshope |first2 = C.R. |title = Parallel Computers 2: Architecture, Programming and Algorithms |publisher = Taylor & Francis |year = 1988 | pages = 46 |isbn = 0-85274-811-6}}</ref> Both models were based on 10 MHz [[National Semiconductor]] [[NS320xx|NS32032]] processors, each with a small write-through cache connected to a common memory to form a [[Shared memory architecture|shared memory]] system. Another early commercial Unix SMP implementation was the NUMA based Honeywell Information Systems Italy XPS-100 designed by Dan Gielan of VAST Corporation in 1985. Its design supported up to 14 processors, but due to electrical limitations, the largest marketed version was a dual processor system. The operating system was derived and ported by VAST Corporation from AT&T 3B20 Unix SysVr3 code used internally within AT&T.
Earlier non-
== Uses ==
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