A GPU-accelerated continuous and discontinuoous Galerkin non-hydrostatic atmospheric model
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Authors
Abdi, Daniel S.
Wilcox, Lucas C.
Warburton, Timothy C.
Giraldo, Francis X.
Subjects
NUMA
GPU
HPC
OCCA
Atmospheric model
Discontinuous Galerkin
Continuous Galerkin
GPU
HPC
OCCA
Atmospheric model
Discontinuous Galerkin
Continuous Galerkin
Advisors
Date of Issue
2017
Date
Publisher
Sage Publications
Language
Abstract
We present a Graphics Processing Unit (GPU)-accelerated nodal discontinuous Galerkin method for the solution of the three-dimensional Euler equations that govern the motion and thermodynamic state of the atmosphere. Acceleration of the dynamical core of atmospheric models plays an important practical role in not only getting daily forecasts faster, but also in obtaining more accurate (high resolution) results within a given simulation time limit. We use algorithms suitable for the single instruction multiple thread architecture of GPUs to accelerate our model by two orders of magnitude relative to one core of a CPU. Tests on one node of the Titan supercomputer show a speedup of up to 15 times using the K20X GPU as compared to that on the 16-core AMD Opteron CPU. The scalability of the multi-GPU implementation is tested using 16,384 GPUs, which resulted in a weak scaling efficiency of about 90%. Finally, the accuracy and performance of our GPU implementation is verified using several benchmark problems representative of different scales of atmospheric dynamics.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1177/1094342017694427
Series/Report No
Department
Applied Mathematics
Organization
Identifiers
NPS Report Number
Sponsors
Office of Naval Research (ONR)
Funder
Grant number PE-0602435N (ONR)
Format
29 p.
Citation
D.S. Abdi, L.C. Wilcox, T.C. Warburton, F.X. Giraldo, "A GPU-sccelerated continuous and discontinuous Galerkin non-hydrostatic atmospheric model," International Journal of High Performance Computing Applications, (2017), pp. 1-29
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.