The Impact of Injection Bandwidth Performance on Application Scalability

  • Kevin T. Pedretti
  • Ron Brightwell
  • Doug Doerfler
  • K. Scott Hemmert
  • James H. LarosIII
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6960)

Abstract

Future exascale systems are expected to have significantly reduced network bandwidth relative to computational performance than current systems. Clearly, this will impact bandwidth-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 bandwidth performance of a 160-node, 1920-core Cray XT5 system and analyze the performance and scalability of a suite of MPI benchmarks and applications.

Keywords

bandwidth configurability benchmarking exascale co-design 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Kevin T. Pedretti
    • 1
  • Ron Brightwell
    • 1
  • Doug Doerfler
    • 1
  • K. Scott Hemmert
    • 1
  • James H. LarosIII
    • 1
  1. 1.Sandia National LaboratoriesAlbuquerqueUSA

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