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Publications of SPCL
|T. Schulthess, P. Bauer, O. Fuhrer, T. Hoefler, C. Schaer, N. Wedi:|
|Reflecting on the goal and baseline for exascale computing: a roadmap based on weather and climate simulations|
(Computing in Science and Engineering (CiSE). Vol , Nr. , In , presented in , pages , IEEE Computer Society, ISSN: , ISBN: , Jan. 2019, )
AbstractWe present a roadmap towards exascale computing based on true application performance goals. It is based on two state-of-the art European numerical weather prediction models (IFS from ECMWF and COSMO from MeteoSwiss) and their current performance when run at very high spatial resolution on present-day supercomputers. We conclude that these models execute about 100-250 times too slow for operational throughput rates at a horizontal resolution of 1 km, even when executed on a full petascale system with nearly 5,000 state-of-the-art hybrid GPU-CPU nodes. Our analysis of the performance in terms of a metric that assesses the efficiency of memory use shows a path to improve the performance of hardware and software in order to meet operational requirements early next decade.