Visible to the public Parallel Reconstruction of Three Dimensional Magnetohydrodynamic Equilibria in Plasma Confinement Devices

TitleParallel Reconstruction of Three Dimensional Magnetohydrodynamic Equilibria in Plasma Confinement Devices
Publication TypeConference Paper
Year of Publication2017
AuthorsSeal, S. K., Cianciosa, M. R., Hirshman, S. P., Wingen, A., Wilcox, R. S., Unterberg, E. A.
Conference Name2017 46th International Conference on Parallel Processing (ICPP)
ISBN Number978-1-5386-1042-8
Keywordscomposability, confinement, Cray XC30 supercomputer, Cyber-physical systems, data parallelism, Force, formal analysis, fusion data, Magnetohydrodynamics, Mathematical model, Nickel, parallel algorithms, parallel reconstruction, parallel V3FIT, plasma confinement devices, plasma equilibria, plasma magnetohydrodynamics, plasma simulation, plasma toroidal confinement, privacy, pubcrawl, resilience, Resiliency, stellarators, three dimensional magnetohydrodynamic equilibria, three dimensional plasma equilibrium reconstructions, three dimensional plasma reconstruction code, Three-dimensional displays, Tokamak devices, tokamaks

Fast, accurate three dimensional reconstructions of plasma equilibria, crucial for physics interpretation of fusion data generated within confinement devices like stellarators/ tokamaks, are computationally very expensive and routinely require days, even weeks, to complete using serial approaches. Here, we present a parallel implementation of the three dimensional plasma reconstruction code, V3FIT. A formal analysis to identify the performance bottlenecks and scalability limits of this new parallel implementation, which combines both task and data parallelism, is presented. The theoretical findings are supported by empirical performance results on several thousands of processor cores of a Cray XC30 supercomputer. Parallel V3FIT is shown to deliver over 40X speedup, enabling fusion scientists to carry out three dimensional plasma equilibrium reconstructions at unprecedented scales in only a few hours (instead of in days/weeks) for the first time.

Citation Keyseal_parallel_2017