Early Experiments with the OpenMP/MPI Hybrid Programming Model

Ewing Lusk and Anthony Chan

International Workshop on OpenMP (IWOMP 2008)
Purdue University, West Lafayette, IN, USA, May 12th - May 14th 2008

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Summary

This paper describes some very early experiments on architectures that support the hybrid programming Model. Our results are promising in that OpenMP threads interact with MPI as desired, allowing OpnMP-agnostic tools to be used. We explore three environments: a "typical" Linux cluster, a new large-scale machine from SiCortex, and the new IBM BG/P, which have quite different compilers and runtime systems for both OpenMP and MPI. We look at a few simple, disagnostic programs and one "application-like test program. We demonstrate the use of a visual tools that can examine the detailed sequence of events in a hybrid program and illustrate that a hybrid computation might not always proceed as expected.

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