Geodesic
Evaluating Kernels on Xeon Phi to accelerate Gysela application
Guillaume Latu1 ; Matthieu Haefele2, 3 ; Julien Bigot3 ; Virginie Grandgirard1 ; Thomas Cartier-Michaud1 ; Fabien Rozar1, 3
1 CEA, IRFM, F-13108 Saint-Paul-lez-Durance
2 IPP, Boltzmannstrasse 2, D-85748 Garching
3 Maison de la Simulation, CEA/CNRS/Inria/Univ. Paris-Sud/Univ. de Versailles, F-91191, Gif-sur-Yvette Cedex
ESAIM. Proceedings, Tome 53 (2016), pp. 211-231.

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This work describes the challenges presented by porting parts of the Gysela code to the Intel Xeon Phi coprocessor, as well as techniques used for optimization, vectorization and tuning that can be applied to other applications. We evaluate the performance of some generic micro-benchmark on Phi versus Intel Sandy Bridge. Several interpolation kernels useful for the Gysela application are analyzed and the performances are shown. Some memory-bound and compute-bound kernels are accelerated by a factor 2 on the Phi device compared to Sandy architecture. Nevertheless, it is hard, if not impossible, to reach a large fraction of the peak performance on the Phi device, especially for real-life applications as Gysela. A collateral benefit of this optimization and tuning work is that the execution time of Gysela (using 4D advections) has decreased on a standard architecture such as Intel Sandy Bridge.
DOI : 10.1051/proc/201653013

Guillaume Latu 1 ; Matthieu Haefele 2, 3 ; Julien Bigot 3 ; Virginie Grandgirard 1 ; Thomas Cartier-Michaud 1 ; Fabien Rozar 1, 3

1 CEA, IRFM, F-13108 Saint-Paul-lez-Durance
2 IPP, Boltzmannstrasse 2, D-85748 Garching
3 Maison de la Simulation, CEA/CNRS/Inria/Univ. Paris-Sud/Univ. de Versailles, F-91191, Gif-sur-Yvette Cedex 
@article{EP_2016_53_a13,
     author = {Guillaume Latu and Matthieu Haefele and Julien Bigot and Virginie Grandgirard and Thomas Cartier-Michaud and Fabien Rozar},
     title = {Evaluating {Kernels} on {Xeon} {Phi} to accelerate {Gysela} application},
     journal = {ESAIM. Proceedings},
     pages = {211--231},
     publisher = {mathdoc},
     volume = {53},
     year = {2016},
     doi = {10.1051/proc/201653013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc/201653013/}
}
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Guillaume Latu; Matthieu Haefele; Julien Bigot; Virginie Grandgirard; Thomas Cartier-Michaud; Fabien Rozar. Evaluating Kernels on Xeon Phi to accelerate Gysela application. ESAIM. Proceedings, Tome 53 (2016), pp. 211-231. doi : 10.1051/proc/201653013. http://geodesic.mathdoc.fr/articles/10.1051/proc/201653013/

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