Evaluating Data Redistribution in PaRSEC

Qinglei Cao, George Bosilca, Nuria Losada, Wei Wu, Dong Zhong, Jack Dongarra

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Data redistribution aims to reshuffle data to optimize some objective for an algorithm. The objective can be multi-dimensional, such as improving computational load balance or decreasing communication volume or cost, with the ultimate goal of increasing the efficiency and therefore reducing the time-to-solution for the algorithm. The classic redistribution problem focuses on optimally scheduling communications when reshuffling data between two regular, usually block-cyclic, data distributions. Besides distribution, data size is also a performance-critical parameter because it affects the reshuffling algorithm in terms of cache, communication efficiency, and potential parallelism. In addition, task-based runtime systems have gained popularity recently as a potential candidate to address the programming complexity on the way to exascale. In this scenario, it becomes paramount to develop a flexible redistribution algorithm for task-based runtime systems, which could support all types of regular and irregular data distributions and take data size into account. In this article, we detail a flexible redistribution algorithm and implement an efficient approach in a task-based runtime system, PaRSEC. Performance results show great capability compared to the theoretical bound and ScaLAPACK, and applications highlight an increased efficiency with little overhead in terms of data distribution, data size, and data format.
Original languageEnglish (US)
Pages (from-to)1856-1872
Number of pages17
Issue number8
StatePublished - Nov 30 2021
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-05-26
Acknowledgements: This work was supported in part by the Exascale Computing Project under Grant 17-SC-20-SC, a collaborative effort of the U.S. Department of Energy Office of Science and the National Nuclear Security Administration. For computer time, this research used the Shaheen II supercomputer hosted at the Supercomputing Laboratory at KAUST.
The authors would like to thank Aurelien Bouteiller for multi-threaded supports in PaRSEC Cray Inc. and Intel in the context of the Cray Center of Excellence and Intel Parallel Computing Center awarded to the Extreme Computing Research Center at KAUST.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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