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

Voir la notice de l'article

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},
     year = {2013},
     volume = {43},
     doi = {10.1051/proc/201343008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc/201343008/}
}
TY  - JOUR
AU  - J. Bigot
AU  - V. Grandgirard
AU  - G. Latu
AU  - Ch. Passeron
AU  - F. Rozar
AU  - O. Thomine
TI  - Scaling gysela code beyond 32K-cores on bluegene/Q
JO  - ESAIM. Proceedings
PY  - 2013
SP  - 117
EP  - 135
VL  - 43
UR  - http://geodesic.mathdoc.fr/articles/10.1051/proc/201343008/
DO  - 10.1051/proc/201343008
LA  - en
ID  - EP_2013_43_a8
ER  - 
%0 Journal Article
%A J. Bigot
%A V. Grandgirard
%A G. Latu
%A Ch. Passeron
%A F. Rozar
%A O. Thomine
%T Scaling gysela code beyond 32K-cores on bluegene/Q
%J ESAIM. Proceedings
%D 2013
%P 117-135
%V 43
%U http://geodesic.mathdoc.fr/articles/10.1051/proc/201343008/
%R 10.1051/proc/201343008
%G en
%F EP_2013_43_a8
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

Cité par Sources :