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Runtime support and compilation methods for user-specified irregular data distributions

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5 Author(s)
R. Ponnusamy ; Dept. of Comput. Sci., Maryland Univ., College Park, MD, USA ; J. Saltz ; A. Choudhary ; Yuan-Shin Hwang
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This paper describes two new ideas by which a High Performance Fortran compiler can deal with irregular computations effectively. The first mechanism invokes a user specified mapping procedure via a set of proposed compiler directives. The directives allow use of program arrays to describe graph connectivity, spatial location of array elements, and computational load. The second mechanism is a conservative method for compiling irregular loops in which dependence arises only due to reduction operations. This mechanism in many cases enables a compiler to recognize that it is possible to reuse previously computed information from inspectors (e.g., communication schedules, loop iteration partitions, and information that associates off-processor data copies with on-processor buffer locations). This paper also presents performance results for these mechanisms from a Fortran 90D compiler implementation

Published in:

IEEE Transactions on Parallel and Distributed Systems  (Volume:6 ,  Issue: 8 )