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How are vector machines (e.g. the Cray-1 and its successors and imitators) similar to, and how are they different from, array processors (Flynn's SIMD category of machines)? Are they suitable for solving the same types of problems? Why or why not? And why has the vector class of machines, which once dominated the Top 500 supercomputer list, fallen out of favor in recent years?

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Vector machines, also like array processors perform the specified operation by a single machine instruction. The two classes differ mainly by the level of involved parallelism. If the vector machines are usually not parallel machines, the array processors use intensively the spatial parallelism. The difference results from the pipeline utilization; the vectors use only few pipelined execution units that overlap their computations in time....
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