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A note on the strong parallel scalability of numerically scalable Poisson linear solvers

Abstract : In the context of a parallel plasma physics simulation code, we perform a qualitativeperformance study between two natural candidates for the parallel solution of 3D Poisson problemsthat are multigrid and domain decomposition. We selected one representative of each of thesenumerical techniques implemented in state of the art parallel packages and show that dependingon the regime used in terms of number of unknowns per computing cores the best alternative interms of time to solution varies. Those results show the interest of having both types of numericalsolvers integrated in a simulation code that can be used in very different configurations in termsof selected modelisations, problem sizes and parallel computing platforms.
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https://hal.inria.fr/hal-03352049
Contributor : Luc Giraud Connect in order to contact the contributor
Submitted on : Friday, September 24, 2021 - 12:24:53 PM
Last modification on : Thursday, October 27, 2022 - 4:02:37 AM

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  • HAL Id : hal-03352049, version 2

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Emmanuel Agullo, Luc Giraud, Valentin Joncquieres, Gilles Marait, Louis Poirel, et al.. A note on the strong parallel scalability of numerically scalable Poisson linear solvers. [Research Report] RR-9423, Inria Bordeaux - Sud Ouest. 2021, pp.31. ⟨hal-03352049v2⟩

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