Publications of Torsten Hoefler

Torsten Hoefler, P. Gottschling, Andrew Lumsdaine and Wolfgang Rehm:

Optimizing a Conjugate Gradient Solver with Non-Blocking Collective Operations

(Elsevier Journal of Parallel Computing (PARCO). Vol 33, Nr. 9, pages 624-633, Elsevier, ISSN: 0167-8191, Sep. 2007)

Abstract

This paper presents a case study that analyzes the suitability and usage of non-blocking collective operations in parallel applications. As with their point-to-point counterparts, non-blocking collective operations provide the ability to overlap communication with computation and to avoid unnecessary synchronization. These operations are provided for MPI programs with LibNBC, a portable low-overhead implementation of non-blocking collective operations built on MPI-1. The straightforward applicability of the LibNBC is demonstrated by incorporating non-blocking collective operations into a parallel conjugate gradient solver. Although only minor changes are required to use them, non-blocking collective operations allow most of the communication costs to be hidden and provide performance improvements of up to 34%. We also show that, because of overlap, there is no significant performance difference between Gigabit Ethernet and InfiniBandTM for special cases of our calculation.

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BibTeX

@article{hoefler-app-parco,
  author={Torsten Hoefler and P. Gottschling and Andrew Lumsdaine and Wolfgang Rehm},
  title={{Optimizing a Conjugate Gradient Solver with Non-Blocking Collective Operations}},
  journal={Elsevier Journal of Parallel Computing (PARCO)},
  year={2007},
  month={Sep.},
  pages={624-633},
  volume={33},
  number={9},
  publisher={Elsevier},
  issn={0167-8191},
  source={http://www.unixer.de/~htor/publications/},
}


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