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This paper explores the prefix operation on a message-passing frilly connected multicomputer with multiport postal communication. We present an exact communication lower bound for the prefix operation on the model. Two efficient parallel prefix algorithms are also presented; they are optimal in terms of the number of communication steps. For an input of size n, one of the algorithms using n processors is also time-optimal; the other algorithm using p<n processors can be cost-optimal and can achieve linear speedup.

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