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Multithreaded Global Address Space Communication Techniques for Gyrokinetic Fusion Applications on Ultra-Scale Platforms
SESSION: Best Paper Finalists
EVENT TYPE: Paper, Best Paper (BP) Finalist
TIME: 1:30PM - 2:15PM
AUTHOR(S):Robert Preissl, Nathan Wichmann, Bill Long, John Shalf, Stephane Ethier, Alice Koniges
ABSTRACT: We present novel parallel language constructs for the communication intense part of a real world magnetic fusion simulation code. The focus of this work is the shift phase of charged particles of a tokamak simulation code in a toroidal geometry. We introduce hybrid PGAS/OpenMP implementations of highly optimized hybrid MPI/OpenMP based magnetic fusion communication kernels. The hybrid PGAS implementations use an extension of standard hybrid programming techniques, enabling the distribution of high communication work loads of the underlying kernel among OpenMP threads. Building upon lightweight one-sided CAF/Fortran2008 communication techniques, we also show the benefits of spreading out the communication over a longer period of time, resulting
in a reduction of bandwidth requirements and a more sustained communication and computation overlap.
Experiments on up to 126K processors are conducted on the worlds largest HPC platform with hardware support for one-sided communication and show performance improvements of 58% on largest scale.
Robert Preissl - Lawrence Berkeley National Laboratory
Nathan Wichmann - Cray Inc.
Bill Long - Cray Inc.
John Shalf - Lawrence Berkeley National Laboratory