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A parallel bucket-sort algorithm is presented that requires time O (log n ) and the use of n processors. The algorithm makes use of a technique that requires more space than the product of processors and time. A realistic model is used in which no memory contention is permitted. A procedure is also presented to sort n numbers in time O ( k log n ) using n 1 + 1 / k processors, for k an arbitrary integer. The model of computation for this procedure permits simultaneous fetches from the same memory location.
D. S. Hirschberg (Tue,) studied this question.