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Title: MPI Collective Algorithm Selection and Quadtree Encoding


Jelena Pjesivac-Grbovic, Graham E. Fagg, Thara Angskun, George Bosilca, Jack J. Dongarra


Selecting the close-to-optimal collective algorithm based on the parameters of the collective call at run time is an important step in achieving good performance of MPI applications. In this paper, we focus on MPI collective algorithm selection process and explore the applicability of the quadtree encoding method to this problem. We construct quadtrees with different properties from the measured algorithm performance data and analyze the quality and performance of decision functions generated from these trees. The experimental data shows that in some cases, the decision function based on a quadtree structure with a mean depth of 3 can incur as little as a 5% performance penalty on average. The exact, experimentally measured, decision function for all tested collectives could be fully represented using quadtrees with a maximum of 6 levels. These results indicate that quadtrees may be a feasible choice for both processing of the performance data and automatic decision function generation.

Presented: Euro PVM/MPI 2006, September, 2006, in Bonn, Germany.


euro-pvmmpi-2006-collective-alg-selection.pdf (PDF)

Bibtex reference:

   author =    {Jelena Pje{s}ivac-Grbovi\'{c} and Graham E. Fagg and Thara Angskun and George Bosilca and Jack J. Dongarra},
   title =     {MPI Collective Algorithm Selection and Quadtree Encoding},
   booktitle = {In Proceedings, 13th European PVM/MPI Users' Group Meeting},
   year =      {2006},
   address =   {Bonn, Germany},
   month =     {September},