MERCIER, Guillaume; JEANNOT, Emmanuel

doi:10.1007/978-3-642-24449-0

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MERCIER, Guillaume
Efficient runtime systems for parallel architectures [RUNTIME]
Laboratoire Bordelais de Recherche en Informatique [LaBRI]

JEANNOT, Emmanuel
Efficient runtime systems for parallel architectures [RUNTIME]

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Communication dans un congrès

Ce document a été publié dans

EuroMPI, 2011-09-18, Santorini. 2011-09-18, vol. 6960, p. 39-49

Résumé en anglais

Modern hardware architectures featuring multicores and a complex memory hierarchy raise challenges that need to be addressed by parallel applications programmers. It is therefore tempting to adapt an application communication pattern to the characteristics of the underlying hardware. The MPI standard features several functions that allow the ranks of MPI processes to be reordered according to a graph attached to a newly created communicator. In this paper, we explain how the MPICH2 implementation of the MPI_Dist_graph_create function was modified to reorder the MPI process ranks to create a match between the application communication pattern and the hardware topology. The experimental results on a multicore cluster show that improvements can be achieved as long as the application communication pattern is expressed by a relevant metric.< Réduire

Mots clés en anglais

Message-Passing

multicore architectures

process placement

rank reordering

communication pattern

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Improving MPI Applications Performance on Multicore Clusters with Rank Reordering

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