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International Journal of High Performance Computing Applications
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Dual-Level Parallel Analysis of Harbor Wave Response Using MPI and OpenMP

Steve W. Bova

Mississippi State University and U.S. Army ERDC Major Shared Resource Center

Clay P. Breshears

Rice University and U.S. Army ERDC Major Shared Resource Center

Christine E. Cuicchi

Computational Science and Engineering Group, U.S. Army ERDC Major Shared Resource Center

Zeki Demirbilek

U.S. Army ERDC Coastal and Hydraulics Laboratory

Henry A. Gabb

Computer Sciences Corporation and U.S. Army ERDC Major Shared Research Center

The authors describe their experiences converting an existing serial production code to a parallel code combining both MPI and OpenMP. Such dual-level parallel codes will be able to take full advantage of the emerging class of high performance computer architectures using small clusters of shared-memory processors connected via a message-passing network. While the focus is restricted to a harbor response simulation code, the techniques presented herein are appropriate for a broad class of applications that explore a parameter space. The code modifications reduced the execution time of one test case from 3100 minutes on a single CPU to just over 12 minutes on 256 CPUs. Results demonstrate that dual-level parallelism allows substantial increases in model resolution combined with improvements in simulation turnaround time but, contrary to conventional wisdom, requires very little source code alteration.

International Journal of High Performance Computing Applications, Vol. 14, No. 1, 49-64 (2000)
DOI: 10.1177/109434200001400104
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