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Exploiting More Parallelism from Applications Having Generalized Reductions on GPU Architectures

Xiao-Long Wu, Nady Obeid, Wen-Mei Hwu
Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign
10th IEEE International Conference on Computer and Information Technology, 2010

@conference{wu2010exploiting,

   title={Exploiting More Parallelism from Applications Having Generalized Reductions on GPU Architectures},

   author={Wu, X.L. and Obeid, N. and Hwu, W.M.},

   booktitle={2010 10th IEEE International Conference on Computer and Information Technology (CIT 2010)},

   pages={1175–1180},

   year={2010},

   organization={IEEE}

}

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Reduction is a common component of many applications, but can often be the limiting factor for parallelization. Previous reduction work has focused on detecting reduction idioms and parallelizing the reduction operation by minimizing data communications or exploiting more data locality. While these techniques can be useful, they are mostly limited to simple code structures. In this paper, we propose a method for exploiting more parallelism by isolating the reduction from users of the intermediate results. The other main contribution of our work is enabling the parallelization of more complex reduction codes, including those that involve the use of intermediate reduction results. The proposed transformations are often implemented by programmers in an ad-hoc manner, but to the best of our knowledge no previous work has been proposed to automate these transformations for many-core architectures. We show that the automatic transformations can result in significant speedup compared to the original code using two benchmark applications.
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