sponsored byACMIEEE The International Conference for High Performance 
Computing, Networking, Storage and Analysis
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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


TIME: 1:30PM - 2:00PM

SESSION CHAIR(S): Daniel S. Katz

AUTHOR(S):Tobias Gysi, Carlos Osuna, Oliver Fuhrer, Mauro Bianco, Thomas C. Schulthess



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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Paper provided by the ACM Digital Library

Paper also available from IEEE Computer Society