ICON on the Way to Exascale - Current Status and Steps towards Scalable Development
DescriptionThe development of the weather and climate model ICON started more than 20 years ago. The model has a large monolithic code base mostly written in Fortran. By using OpenACC directives the atmospheric component of the model has been enabled to run successfully on (NVIDIA) GPU-based HPC systems like Piz Daint and JUWELS Booster. However, getting to run the model on the AMD GPU-based system LUMI has already highlighted the limitations of this strategy. Here, we will present first results on the performance and code scalability of the current code-base on the pre-exascale systems LUMI and JUWELS Booster. Further, we will outline our strategy and show first steps towards a scalable, modularized, flexible open-source code, which will enable scalable development and accelerate refactoring for performance and performance portability.
TimeWednesday, June 2811:30 - 12:00 CEST
Climate, Weather and Earth Sciences