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Automatic Parallelization of Canonical Loops

Leonardo Luiz Padovani da MataFernando Magno Quintão PereiraRenato Ferreira

This paper presents a compilation technique that performs automatic parallelization of canonical loops. Canonical loops are a pattern observed in many well known algorithms, such as frequent itemsets, K-means and K nearest neighbors. Automatic parallelization allows application developers to focus on the algorithmic details of the problem they are solving, leaving for the compiler the task of generating correct and efficient parallel code. Our method splits tasks and data among stream processing elements and uses a novel technique based on labeled-streams to minimize the communication between filters. Experiments performed on a cluster of 36 computers indicate that, for the three algorithms mentioned above, our method produces code that scales linearly on the number of available processors. These experiments also show that the automatically generated code is competitive when compared to hand tuned programs.

http://www.lbd.dcc.ufmg.br/colecoes/sblp/2009/007.pdf

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