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SCHEDULE: NOV 15-20, 2015
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STELLA: A Domain-Specific Tool for Structured Grid Methods in Weather and Climate Models
SESSION: Applications: Climate and Weather
EVENT TYPE: Papers
TIME: 1:30PM - 2:00PM
SESSION CHAIR(S): Daniel S. Katz
AUTHOR(S):Tobias Gysi, Carlos Osuna, Oliver Fuhrer, Mauro Bianco, Thomas C. Schulthess
ROOM:18CD
ABSTRACT:
Many high-performance computing applications solving partial differential equations (PDEs) can be attributed to the class of kernels using stencils on structured grids. Due to the disparity between floating point operation throughput and main memory bandwidth these codes typically achieve only a low fraction of peak performance. Unfortunately, stencil computation optimization techniques are often hardware dependent and lead to a significant increase in code complexity. We present a domain-specific tool, STELLA, which eases the burden of the application developer by separating the architecture dependent implementation strategy from the user-code and is targeted at multi- and manycore processors. On the example of a numerical weather prediction and regional climate model (COSMO) we demonstrate the usefulness of STELLA for a real-world production code. The dynamical core based on STELLA achieves a speedup factor of 1.8x (CPU) and 5.8x (GPU) with respect to the legacy code while reducing the complexity of the user code.
Chair/Author Details:
Daniel S. Katz (Chair) - University of Chicago and Argonne National Laboratory|
Tobias Gysi - ETH Zurich
Carlos Osuna - ETH Zurich
Oliver Fuhrer - Federal Office of Meteorology and Climatology MeteoSwiss
Mauro Bianco - Swiss National Supercomputing Center
Thomas C. Schulthess - Swiss National Supercomputing Center
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