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A Case Study of Communication Optimizations on 3D Mesh Interconnects

  • Abhinav Bhatelé
  • Eric Bohm
  • Laxmikant V. Kalé
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5704)

Abstract

Optimal network performance is critical to efficient parallel scaling for communication-bound applications on large machines. With wormhole routing, no-load latencies do not increase significantly with number of hops traveled. Yet, we, and others have recently shown that in presence of contention, message latencies can grow substantially large. Hence task mapping strategies should take the topology of the machine into account on large machines. In this paper, we present topology aware mapping as a technique to optimize communication on 3-dimensional mesh interconnects and hence improve performance.

Our methodology is facilitated by the idea of object-based decomposition used in Charm++ which separates the processes of decomposition from mapping of computation to processors and allows a more flexible mapping based on communication patterns between objects. Exploiting this and the topology of the allocated job partition, we present mapping strategies for a production code, OpenAtom to improve overall performance and scaling. OpenAtom presents complex communication scenarios of interaction involving multiple groups of objects and makes the mapping task a challenge. Results are presented for OpenAtom on up to 16,384 processors of Blue Gene/L, 8,192 processors of Blue Gene/P and 2,048 processors of Cray XT3.

Keywords

Idle Time Task Mapping Topology Information Communication Optimization Large Machine 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Abhinav Bhatelé
    • 1
  • Eric Bohm
    • 1
  • Laxmikant V. Kalé
    • 1
  1. 1.Department of Computer ScienceUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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