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Exercise 18: A determination of the PMS diagram for the crossbar switch connecting the processing elements of a MasPar MP-1 and a Fujitsu VPP500.

Most of the uses of a crossbar switch mentioned in this chapter connect a set of processors on the ``input'' side to a set of memories on the ``output'' side (Figure 14). However, two systems, the Fujitsu VPP500 and the MasPar MP-1, use a crossbar to interconnect processing elements (PEs), nodes which consist of a processor and its local memory. Draw a PMS diagram of such a system and explain how information could be moved from one node to another.