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GTC ON-DEMAND

HPC and Supercomputing
Presentation
Media
Abstract:
We'll present the strategy and results for porting an atmospheric fluids code, HiGrad, to the GPU. Higrad is a cross-compiled, mixed-language code that includes C, C++, and Fortran, and is used for atmospheric modeling. Deep subroutine calls ...Read More
Abstract:

We'll present the strategy and results for porting an atmospheric fluids code, HiGrad, to the GPU. Higrad is a cross-compiled, mixed-language code that includes C, C++, and Fortran, and is used for atmospheric modeling. Deep subroutine calls necessitate detailed control of the GPU data layout with CUDA-Fortran. We'll present initial kernel accelerations with OpenACC, then discuss tuning with OpenACC and a comparison with specially curated CUDA kernels. We'll demonstrate the performance improvement and different techniques used for porting this code to GPUs, using a mixed CUDA-Fortran and OpenACC implementation for single-node performance, and scaling studies conducted with MPI on local supercomputers and Oak Ridge National Laboratory's Titan supercomputer, on different architectures including the Tesla K40 and Tesla P100.

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Topics:
HPC and Supercomputing, Computational Fluid Dynamics
Type:
Talk
Event:
GTC Silicon Valley
Year:
2017
Session ID:
S7735
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