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On systolic contractions of program graphs

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2 Author(s)
Shen, W. ; Dept. of Electr. Eng., New Hampshire Univ., Durham, NH, USA ; Oruc, A.Y.

A variant of the mapping problem, namely, systolic contractions of program graphs, is considered. The notion of time links is introduced to mechanize the contraction process; the timing of information flow between processors is modeled in terms of fundamental loop and path equations of delays and is optimized using linear programming. While the results apply primarily to systolic contractions, they can be extended to other types of graph contractions by relaxing the time constraints imposed by delay equations. Such contractions can, in principle, lead to faster execution of program graphics, since they may do away with the delays imposed on the links between the processors by systolic contractions. Clearly, storage is traded for time since extra storage may be necessary to hold some operands temporarily until a processor acquires all of its operands for a computation

Published in:

Computers, IEEE Transactions on  (Volume:38 ,  Issue: 10 )

Date of Publication:

Oct 1989

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