Scaling the SIESTA Magnetohydrodynamics Equilibrium Code

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Concurrency and Computation: Practice and Experience

DOI:https://doi.org/10.1002/cpe.2919· OSTI ID:1072135

Seal, Sudip K ^[1]; Perumalla, Kalyan S ^[1]; Hirshman, Steven Paul ^[1]

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1. ORNL

We report the results of a scaling effort that increases both the speed and resolution of the SIESTA magnetohydrodynamic equilibrium code. SIESTA is capable of computing three-dimensional plasma equilibria with magnetic islands at high spatial resolutions for toroidally confined plasmas. Starting with a small-scale parallel im- plementation, we identified scale-dependent bottlenecks of the code and developed scalable alternatives for each performance-significant functionality, cumulatively increasing the runtime speed and scalability with the number of processors. The net outcome is an improvement in speed by over ten-fold, utilizing a few thousand processors, en- abling SIESTA to simulate high spatial-resolution scenarios in under an hour for the first time.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Center for Computational Sciences (NCCS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1072135
• Journal Information: Concurrency and Computation: Practice and Experience, Journal Name: Concurrency and Computation: Practice and Experience; ISSN 1532-0626
• Country of Publication: United States
• Language: English