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On some original MPP's (e.g. hypercubes) one worried about nearest neighbor structure of algorithms so could match geometric structure of computers and problems.
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This became unnecessary and all that matters on most machines today is data locality
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e.g. on machines like IBM SP-2, on processor and off processor memory access times are very different but there is no difference between the different processors once you go off CPU
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The year 2005 machines seem different as machine geometry seems relevant especially in PIM designs with physical transit time important as clock speeds increase.
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