Parallel and Sequential cases differ in
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geometry
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boundaries
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We also saw this in "society" analogy with Hadrian's wall
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This analysis implies SPMD - Single Programming Multiple Data - programming model i.e. each nodes executes the same program but runs through different data
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Also note that not only does each node of the parallel machine run the same program but also this program is very similar to sequential program as long as one isolates boundary and geometry sections
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Note that this problem can be solved on SIMD or MIMD computer. Thus SPMD example is not totally general. There are SPMD examples which require MIMD machines
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