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HPC Innovation Excellence Award: Culham Centre for Fusion Energy, EPCC at the University of Edinburgh, York Plasma Institute at the University of York, and Lund University

Country: 

United Kingdom

Project Leader(s):

David Dickinson, Adrian Jackson, Colin M. Roach and Joachim Hein

Date:

June 2014
Researchers from CCFE, EPCC and the Universities of York and Lund have made substantial recent optimizations for the well-known plasma turbulence code, GS2.

Researchers from CCFE, EPCC and the Universities of York and Lund have made substantial recent optimizations for the well-known plasma turbulence code, GS2. This included a total rewrite of the routines that calculate the response matrices required by the code's implicit algorithm, which has significantly accelerated GS2’s initialization, typically by a factor over 10. Taken together these optimizations have vastly reduced wall-time, as illustrated by the impressive factor 20 gain in speed that was achieved for a benchmark calculation running on 8,192 cores. The optimized code achieves scaling efficiencies close to 50% at 4,096 cores and 30% at 8,192 cores for a typical calculation, compared to efficiencies of 4% and 2% respectively prior to these optimizations.

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