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First generation message passing systems only allowed one to transmit information originating in a contiguous array of bytes
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Hid the real data structure from hardware and programmer
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Might make it hard to provide efficient implementations as implied a lot of expensive memory accesses
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Required pre-packing dispersed data, e.g.:
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Rows (in Fortran, columns in C) of a matrix must be transposed before transmission
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Prevented convenient communication between machines with different data representations
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