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2006
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Topology-aware task mapping for reducing communication contention on large parallel machines

9 years 4 months ago
Topology-aware task mapping for reducing communication contention on large parallel machines
Communication latencies constitute a significant factor in the performance of parallel applications. With techniques such as wormhole routing, the variation in no-load latencies became insignificant, i.e., the no-load latencies for far-away processors were not significantly higher (and too small to matter) than those for nearby processors. Contention in the network is then left as the major factor affecting latencies. With networks such as Fat-Trees of hypercubes, with number of wires growing as P log P, even this is not a very significant factor. However, for torus and grid networks now being used in large machines such as BlueGene/L and the Cray XT3, such contention becomes an issue. We quantify the effect of this contention with benchmarks that vary the number of hops traveled by each communicated byte. We then demonstrate a process mapping strategy that minimizes the impact of topology by heuristically minimizing the total number of hop-bytes communicated. This strategy, and i...
T. Agarwal, Amit Sharma, A. Laxmikant, Laxmikant V
Added 12 Jun 2010
Updated 12 Jun 2010
Type Conference
Year 2006
Where IPPS
Authors T. Agarwal, Amit Sharma, A. Laxmikant, Laxmikant V. Kalé
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