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Partitioning and mapping nested loops on multiprocessor systems

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2 Author(s)
Jang-Ping Sheu ; Dept. of Electr. Eng., Nat. Central Univ., Chung-Li, Taiwan ; Tsu-Huei Tai

A method for executing nested loops with constant loop-carried dependencies in parallel on message-passing multiprocessor systems to reduce communication overhead is presented. In the partitioning phase, the nested loop is divided into blocks that reduce the interblock communication, without regard to the machine topology. The execution ordering of the iterations is defined by a given time function based on L. Lamport's (1974) hyperplane method. The iterations are then partitioned into blocks so that the execution ordering is not disturbed, and the amount of interblock communication is minimized. In the mapping phase, the partitioned blocks are mapped onto a fixed-size multiprocessor system in such a manner that the blocks that have to exchange data frequently are allocated to the same processor or neighboring processors. A heuristic mapping algorithm for hypercube machines is proposed

Published in:

Parallel and Distributed Systems, IEEE Transactions on  (Volume:2 ,  Issue: 4 )

Date of Publication:

Oct 1991

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