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Erschienen in:
2017 | OriginalPaper | Buchkapitel
Micro-benchmarking MPI Neighborhood Collective Operations
verfasst von : Felix Donatus Lübbe
Erschienen in: Euro-Par 2017: Parallel Processing
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Abstract
In this article, performance expectations for MPI neighborhood collective operations are formulated as self-consistent performance guidelines. A microbenchmark and an experimental methodology are presented to assess these guidelines. Measurement results from a large, InfiniBand-based cluster, the Vienna Scientific Cluster (VSC), as well as from a small commodity cluster computer are shown and discussed to illustrate the methodology and to gain first insights into the performance of current MPI implementations. Results show that the examined libraries seem to be sensitive to the order in which topological neighbors are specified, and that in some cases Cartesian topologies can be outperformed by simulating them with distributed graph topologies.