Abstract
The magnetohydrodynamic (MHD) equilibrium problem in magnetic confinement fusion devices is solved by using the variational moments equilibrium code (VMEC). The sequential version of the code is highly demanding in computational terms, requiring several days of CPU time in the most advanced computers. In this work, we present the parallelization techniques employed for this code. An automatic tool has been used to guide the data parallelization of the critical parts of the code, and some deficiencies in its automatic parallelization techniques have been determined. These shortcomings are overcome by the development of manual techniques, which offer better results. Task parallelism has also been applied to this code in an innovative way, which significantly reduces the parallel overheads due to load imbalance and message waits.
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