The impact of injection bandwidth performance on application scalability

Authors:
Kevin T. Pedretti;Ron Brightwell;Doug Doerfler;K. Scott Hemmert;James H. Laros
Affiliations:
Sandia National Laboratories, Albuquerque, NM;Sandia National Laboratories, Albuquerque, NM;Sandia National Laboratories, Albuquerque, NM;Sandia National Laboratories, Albuquerque, NM;Sandia National Laboratories, Albuquerque, NM
Venue:
EuroMPI'11 Proceedings of the 18th European MPI Users' Group conference on Recent advances in the message passing interface
Year:
2011

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Abstract

Future exascale systems are expected to have significantly reduced network band width relative to computational performance than current systems. Clearly, this will impact band width-intensive applications, so it is important to gain insight into the magnitude of the negative impact on performance and scalability to help identify mitigation strategies. In this paper, we show how current systems can be configured to emulate the expected imbalance of future systems. We demonstrate this approach by reducing the network injection band width performance of a 160-node, 1920-core Cray XT5 system and analyze the performance and scalability of a suite of MPI benchmarks and applications.