Mixed Mode Programming on HPCx

Michał Piotrowski ()
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Michał Piotrowski: University of Edinburgh

A chapter in Parallel Scientific Computing and Optimization, 2009, pp 133-143 from Springer

Abstract: Abstract Clusters of shared memory nodes have become a system of choice for many research and enterprise projects. Mixed mode programming is a combination of shared and distributed programming models and naturally matches the SMP cluster architecture. It can potentially exploit features of the system by replacing the message exchanges within a node with faster direct reads and writes from memory, using message passing only to exchange information between the nodes. Several benchmark codes, based on a simple Jacobi relaxation algorithm, were developed; a pure MPI (Message Passing Interface) version and three mixed mode versions: Master-Only, Funneled, and Multiple. None of the mixed mode versions managed to outperform the pure MPI, mainly due to longer MPI point-to-point communication times. Results will be presented and reasons behind the performance losses discussed.

Keywords: Mixed Mode; Message Passing Interface; Multiple Version; Execution Unit; Master Thread (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1007/978-0-387-09707-7_12

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