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キーワード:
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要旨:
We present an algorithm for all-to-all personalized
communication, in which every processor has an individual message to
deliver to every other processor. The machine model we consider is a
cluster of processing nodes where each node, possibly consisting of
several processors, can participate in only one communication
operation with another node at a time. The nodes may have different
numbers of processors. This general model is important for the
implementation of all-to-all communication in libraries such as MPI
where collective communication may take place over arbitrary subsets
of processors. The algorithm is simple and optimal up to an additive
term that is small if the total number of processors is large compared
to the maximal number of processors in a node.
