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Parallel and Distributed Processing Symposium, International (2008)
Miami, FL, USA
Apr. 14, 2008 to Apr. 18, 2008
ISBN: 978-1-4244-1693-6
pp: 1-7
Francois Trahay , INRIA, LABRI, Université Bordeaux 1, 351 cours de la Libération, F-33405 Talence, France
Elisabeth Brunet , INRIA, LABRI, Université Bordeaux 1, 351 cours de la Libération, F-33405 Talence, France
Alexandre Denis , INRIA, LABRI, Université Bordeaux 1, 351 cours de la Libération, F-33405 Talence, France
Raymond Namyst , INRIA, LABRI, Université Bordeaux 1, 351 cours de la Libération, F-33405 Talence, France
ABSTRACT
The current trend in clusters leads towards an increase of the number of cores per node. As a result, an increasing number of parallel applications is mixing message passing and multithreading as an attempt to better match the underlying architectureés structure. This naturally raises the problem of designing efficient, multithreaded implementations of MPI. In this paper, we present the design of a multithreaded communication engine able to exploit idle cores to speed up communications in two ways: it can move CPU-intensive operations out of the critical path (e.g. PIO transfers offload), and is able to let rendezvous transfers progress asynchronously. We have implemented these methods in the PM2 software suite, evaluated their behavior in typical cases, and we have observed good performance results in overlapping communication and computation.
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CITATION

F. Trahay, A. Denis, R. Namyst and E. Brunet, "A multithreaded communication engine for multicore architectures," 2008 IEEE International Parallel & Distributed Processing Symposium(IPDPS), Miami, FL, 2008, pp. 1-7.
doi:10.1109/IPDPS.2008.4536139
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