Dual-Level Parallel Analysis of Harbor Wave Response Using MPI and OpenMP

Authors:
Steve W. Bova;Clay P. Breshears;Christine E. Cuicchi;Zeki Demirbilek;Henry A. Gabb
Affiliations:
Mississippi State University and U.S. Army ERDC Major Shared Resource Center;Rice University and U.S. Army ERDC Major Shared Resource Center;Computational Science and Engineering Group, U.S. Army ERDC Major Shared Resource Center;U.S. Army ERDC Coastal and Hydraulics Laboratory;Computer Sciences Corporation and U.S. Army ERDC Major Shared Research Center
Venue:
International Journal of High Performance Computing Applications
Year:
2000

Citing 7
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Abstract

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.