Exploiting hierarchy in parallel computer networks to optimize collective operations performance

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The efficient implementation of collective communication operations has received much attention. Initial efforts modeled network communication and produced optimal trees based on those models. However, the models used by these initial efforts assumed equal point-to-point latencies between any two processes. This assumption is violated in heterogeneous systems such as clusters of SMPs and wide-area computational grids, and as a result, collective operations that utilize the trees generated by these models perform suboptimally. In response, more recent work has focused on creating topology-aware trees for collective operations that minimize communication across slower channels (e.g., a wide-area network). While these efforts have ... continued below

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8 pages

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Karonis, N. T.; de Supinski, B. R.; Foster, I.; Gropp, W.; Lusk, E. & Bresnahan, J. February 4, 2000.

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Description

The efficient implementation of collective communication operations has received much attention. Initial efforts modeled network communication and produced optimal trees based on those models. However, the models used by these initial efforts assumed equal point-to-point latencies between any two processes. This assumption is violated in heterogeneous systems such as clusters of SMPs and wide-area computational grids, and as a result, collective operations that utilize the trees generated by these models perform suboptimally. In response, more recent work has focused on creating topology-aware trees for collective operations that minimize communication across slower channels (e.g., a wide-area network). While these efforts have significant communication benefits, they all limit their view of the network to only two layers. The authors present a strategy based upon a multilayer view of the network. By creating multilevel topology trees they take advantage of communication cost differences at every level in the network. They used this strategy to implement topology-aware versions of several MPI collective operations in MPICH-G, the Globus-enabled version of the popular MPICH implementation of the MPI standard. Using information about topology discovered by Globus, they construct these topology-aware trees automatically during execution, thus freeing the MPI application programmer from having to write special files or functions to describe the topology to the MPICH library. They present results demonstrating the advantages of their multilevel approach by comparing it to the default (topology-unaware) implementation provided by MPICH and a topology-aware two-layer implementation.

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8 pages

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  • International Parallel and Distributed Processing Symposium, Cancun (MX), 05/01/2000--05/05/2000; Other Information: PBD: 4 Feb 2000; PBD: 4 Feb 2000

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  • Report No.: ANL/MCS/CP-101052
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 764215
  • Archival Resource Key: ark:/67531/metadc724385

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 4, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • March 21, 2016, 3:55 p.m.

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Karonis, N. T.; de Supinski, B. R.; Foster, I.; Gropp, W.; Lusk, E. & Bresnahan, J. Exploiting hierarchy in parallel computer networks to optimize collective operations performance, article, February 4, 2000; Illinois. (digital.library.unt.edu/ark:/67531/metadc724385/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.