Trach-Minh Tran

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A global plasma turbulence simulation code, ORB5, is presented. It solves the gyrokinetic electrostatic equations including zonal flows in axisymmetric magnetic geometry. The present version of the code assumes a Boltzmann electron response on magnetic surfaces. It uses a Particle-In-Cell (PIC), δf scheme, 3D cubic B-splines finite elements for the field(More)
Parallel applications can be parameterised by the quotient γa of flop/s and data transfers between the processors, and by the machine-dependent, maximum local processor performance ra. Clusters can be parameterised by the quotient γm of ra and the per processor network communication bandwidth bm. All those parameters are predictable. In parallel machines,(More)
The main objective of the Intelligent GRID Scheduling System (ISS) project is to provide a middleware infrastructure allowing a good positioning and scheduling of real life applications in a computational GRID. According to data collected on the machines in the GRID, on the behaviour of the applications, and on the performance requirements demanded by the(More)
microturbulence simulations T. Vernay, S. Brunner, L. Villard, B. F. McMillan, S. Jolliet, T. M. Tran, A. Bottino, and J. P. Graves Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Association EURATOM–Confédération Suisse, CH-1015 Lausanne, Switzerland Japan Atomic Energy Agency, Higashi-Ueno 6-9-3, Taitou, Tokyo(More)
In this work, a Fourier solver [McMillan et. al., Comput. Phys. Commun. 181, 715 (2010)] is implemented in the global Eulerian gyrokinetic code GT5D [Y. Idomura et. al., Nucl. Fusion 49, 065029, 2009] and in the global Particle-In-Cell code ORB5 [S. Jolliet et. al., Comput. Phys. Commun 177, 477 (2007)] in order to reduce the memory of the matrix associated(More)
The authors present the integration of the Intelligent (Grid) Scheduling System into the VIOLA meta-scheduling environment which itself is based on the UNICORE Grid software. The goal of the new, integrated environment is to enable the submission of jobs to the Grid system best-suited for the application workflow. For this purpose a cost function is used(More)
Highly variable flux surface averaged heat fluxes are resolved in gyrokinetic simulations of ion temperature gradient ITG turbulence, even in large systems. Radially propagating fronts or avalanches are also seen. Their propagation lengths in gyroradii and relative amplitude remain constant as simulation size is increased, so the avalanches appear to result(More)
We present a portable platform, called PIC ENGINE, for accelerating Particle-In-Cell (PIC) codes on heterogeneous many-core architectures such as Graphic Processing Units (GPUs). The aim of this development is efficient simulations on future exascale systems by allowing different parallelization strategies depending on the application problem and the(More)