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Conference Papers Year : 2007

Assessing Contention Effects on MPI_Alltoall Communications

Abstract

One of the most important collective communication patterns used in scientific applications is the complete exchange, also called All-to-All. Although efficient algorithms have been studied for specific networks, general solutions like those available in well-known MPI distributions (e.g. the MPI_Alltoall operation) are strongly influenced by the congestion of network resources. In this paper we present an integrated approach to model the performance of the All-to-All collective operation, which consists in identifying a contention signature that characterizes a given network environment, using it to augment a contention-free communication model. This approach, assessed by experimental results, allows an accurate prediction of the performance of the All-to-All operation over different network architectures with a small overhead.
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Dates and versions

hal-00136204 , version 1 (12-03-2007)

Identifiers

  • HAL Id : hal-00136204 , version 1

Cite

Luiz Angelo Steffenel, Maxime Martinasso, Denis Trystram. Assessing Contention Effects on MPI_Alltoall Communications. 2nd International Conference on Grid and Pervasive Computing - GPC 2007, May 2007, France. pp.00. ⟨hal-00136204⟩
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