P33 - ICON-GPU for Numerical Weather Prediction – A Status Report
DescriptionWeather prediction centers are always seeking ways to improve the computational performance of their numerical weather prediction (NWP) models while staying within budget. The era of ever improving scalar CPU has come to an end but massively multiprocessing GPUs are advertised as the next step forward. The ICON framework, a large and continuously developed community code, has been adapted to work with GPU systems through a multi-institute effort using OpenACC directives. MeteoSwiss plans to use ICON-GPU operationally for limited area forecasts in 2023 and current development activities also make ICON-GPU ready to support the enhanced feature set used operationally by the German Weather Service (DWD). On our poster, we present the general porting strategy and the current state of the port. We discuss specific optimizations and the lessons learned while iteratively porting an actively developed code. Finally, we present the performance on current GPU and CPU machines and compare them to the currently operational setup on the DWD vector supercomputer.
TimeTuesday, June 2710:03 - 10:04 CEST