| Issue |
ESAIM: Proc.
Volume 53, March 2016
CEMRACS 2014 – Numerical Modeling of Plasmas
|
|
|---|---|---|
| Page(s) | 191 - 210 | |
| DOI | https://doi.org/10.1051/proc/201653012 | |
| Published online | 01 April 2016 | |
Optimization of the Gyroaverage operator based on Hermite interpolation
1 Maison de la Simulation, USR 3441,
CEA / CNRS / Inria / Univ. Paris-Sud / Univ. Versailles, 91191
Gif-sur-Yvette,
FRANCE
2 IRMA, Université de
Strasbourg, France
3 CEA, IRFM,
F-13108
Saint-Paul-lez-Durance
4 Inria, Bordeaux INP,
CNRS, FR-33405
Talence
Gyrokinetic modeling is appropriate for describing Tokamak plasma turbulence, and the gyroaverage operator is a cornerstone of this approach. In a gyrokinetic code, the gyroaveraging scheme needs to be accurate enough to avoid spoiling the data but also requires a low computation cost because it is applied often on the main unknown, the 5D guiding-center distribution function, and on the 3D electric potentials. In the present paper, we improve a gyroaverage scheme based on Hermite interpolation used in the Gysela code. This initial implementation represents a too large fraction of the total execution time. The gyroaverage operator has been reformulated and is now expressed as a matrix-vector product and a cache-friendly algorithm has been setup. Different techniques have been investigated to quicken the computations by more than a factor two. Description of the algorithms is given, together with an analysis of the achieved performance.
© EDP Sciences, SMAI 2016
This is an open access article distributed under the terms of the Creative
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