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Task-based fast multipole method for clusters of multicore processors
Task-based fast multipole method for clusters of multicore processors
Abstract : Most high-performance, scientific libraries have adopted hybrid parallelization schemes - such as the popular MPI+OpenMP hybridization - to benefit from the capacities of modern distributed-memory machines. While these approaches have shown to achieve high performance, they require a lot of effort to design and maintain sophisticated synchronization/communication strategies. On the other hand, task-based programming paradigms aim at delegating this burden to a runtime system for maximizing productivity. In this article, we assess the potential of task-based fast multipole methods (FMM) on clusters of multicore processors. We propose both a hybrid MPI+task FMM parallelization and a pure task-based parallelization where the MPI communications are implicitly handled by the runtime system. The latter approach yields a very compact code following a sequential task-based programming model. We show that task-based approaches can compete with a hybrid MPI+OpenMP highly optimized code and that furthermore the compact task-based scheme fully matches the performance of the sophisticated, hybrid MPI+task version, ensuring performance while maximizing productivity. We illustrate our discussion with the ScalFMM FMM library and the StarPU runtime system.
Cited literature [35 references]
https://hal.inria.fr/hal-01387482
Contributor : Olivier Coulaud Connect in order to contact the contributor
Submitted on : Thursday, March 23, 2017 - 9:03:21 AM
Last modification on : Friday, January 7, 2022 - 3:55:08 AM
Contributor : Olivier Coulaud Connect in order to contact the contributor
Submitted on : Thursday, March 23, 2017 - 9:03:21 AM
Last modification on : Friday, January 7, 2022 - 3:55:08 AM
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report-8970.pdf
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