Geodesic
Scaling gysela code beyond 32K-cores on bluegene/Q
J. Bigot1 ; V. Grandgirard2 ; G. Latu2 ; Ch. Passeron2 ; F. Rozar1, 2 ; O. Thomine2
1 Maison de la simulation, CEA Saclay, FR-91191 Gif sur Yvette 
2 CEA Cadarache, FR-13108 Saint-Paul-les-Durance 
ESAIM. Proceedings, Tome 43 (2013), pp. 117-135.

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Gyrokinetic simulations lead to huge computational needs. Up to now, the semi- Lagrangian code Gysela performed large simulations using a few thousands cores (8k cores typically). Simulation with finer resolutions and with kinetic electrons are expected to increase those needs by a huge factor, providing a good example of applications requiring Exascale machines. This paper presents our work to improve Gysela in order to target an architecture that presents one possible way towards Exascale: the Blue Gene/Q. After analyzing the limitations of the code on this architecture, we have implemented three kinds of improvement: computational performance improvements, memory consumption improvements and disk i/o improvements. As a result, we show that the code now scales beyond 32k cores with much improved performances. This will make it possible to target the most powerful machines available and thus handle much larger physical cases.
DOI : 10.1051/proc/201343008

J. Bigot 1 ; V. Grandgirard 2 ; G. Latu 2 ; Ch. Passeron 2 ; F. Rozar 1, 2 ; O. Thomine 2

1 Maison de la simulation, CEA Saclay, FR-91191 Gif sur Yvette 
2 CEA Cadarache, FR-13108 Saint-Paul-les-Durance  
@article{EP_2013_43_a8,
     author = {J. Bigot and V. Grandgirard and G. Latu and Ch. Passeron and F. Rozar and O. Thomine},
     title = {Scaling gysela code beyond {32K-cores} on {bluegene/Q}},
     journal = {ESAIM. Proceedings},
     pages = {117--135},
     publisher = {mathdoc},
     volume = {43},
     year = {2013},
     doi = {10.1051/proc/201343008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc/201343008/}
}
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J. Bigot; V. Grandgirard; G. Latu; Ch. Passeron; F. Rozar; O. Thomine. Scaling gysela code beyond 32K-cores on bluegene/Q. ESAIM. Proceedings, Tome 43 (2013), pp. 117-135. doi : 10.1051/proc/201343008. http://geodesic.mathdoc.fr/articles/10.1051/proc/201343008/

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