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Optimised allgatherv, reduce_scatter and allreduce communication in message-passing systems

Autor: Jocksch, Andreas, Ohana, Noe, Lanti, Emmanuel, Karakasis, Vasileios, Villard, Laurent

Collective communications, namely the patterns allgatherv, reduce_scatter, and allreduce in message-passing systems are optimised based on measurements at the installation time of the library. The algorithms used are set up in an initialisation phase

Externí odkaz: http://arxiv.org/abs/2006.13112

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Gyrokinetic Simulations on Many- and Multi-core Architectures with the Global Electromagnetic Particle-In-Cell Code ORB5

Autor: Ohana, Noé, Gheller, Claudio, Lanti, Emmanuel, Jocksch, Andreas, Brunner, Stephan, Villard, Laurent

Gyrokinetic codes in plasma physics need outstanding computational resources to solve increasingly complex problems, requiring the effective exploitation of cutting-edge HPC architectures. This paper focuses on the enabling of ORB5, a state-of-the-ar

Externí odkaz: http://arxiv.org/abs/1908.02219

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Gyrokinetic full-f particle-in-cell simulations on open field lines with PICLS

Autor: Boesl, Mathias Helmut, Bergmann, Andreas, Bottino, Alberto, Coster, David, Lanti, Emmanuel, Ohana, Noe, Jenko, Frank

While in recent years, gyrokinetic simulations have become the workhorse for theoretical turbulence and transport studies in the plasma core, their application to the edge and scrape-off layer (SOL) region presents significant challenges. In particul

Externí odkaz: http://arxiv.org/abs/1908.00318

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First principles gyrokinetic analysis of electromagnetic plasma instabilities

Autor: Tronko, Natalia, Bottino, Alberto, Chandre, Cristel, Sonnendrücker, Eric, Lanti, Emmanuel, Ohana, Noé, Brunner, Stephan, Villard, Laurent

A two-fold analysis of electromagnetic core tokamak instabilities in the framework of the gyrokinetic theory is presented. First principle theoretical foundations of the gyrokinetic theory are used to explain and justify the numerical results obtaine

Externí odkaz: http://arxiv.org/abs/1903.10812

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Implementation of energy transfer technique in ORB5 to study collisionless wave-particle interactions in phase-space

Autor: Novikau, Ivan, Biancalani, Alessandro, Bottino, Alberto, Di Siena, Alessandro, Lauber, Philipp, Poli, Emanuele, Lanti, Emmanuel, Villard, Laurent, Ohana, Noé, Briguglio, Sergio

A new diagnostic has been developed to investigate the wave-particle interaction in the phase-space in gyrokinetic particle-in-cell codes. Based on the projection of energy transfer terms onto the velocity space, the technique has been implemented an

Externí odkaz: http://arxiv.org/abs/1903.05024

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Pullback scheme implementation in ORB5

Autor: Mishchenko, Alexey, Bottino, Alberto, Biancalani, Alessandro, Hatzky, Roman, Hayward-Schneider, Thomas, Ohana, Noe, Lanti, Emmanuel, Brunner, Stephan, Villard, Laurent, Borchardt, Matthias, Kleiber, Ralf, Koenies, Axel

The pullback scheme is implemented in the global gyrokinetic particle-in-cell code ORB5 [S. Jolliet et al, Comp. Phys. Comm., 177, 409 (2007)] to mitigate the cancellation problem in electromagnetic simulations. The equations and the discretisation u

Externí odkaz: http://arxiv.org/abs/1811.05346

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