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DTSTART;TZID=Europe/Stockholm:20230628T113000
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UID:submissions.pasc-conference.org_PASC23_sess165_msa176@linklings.com
SUMMARY:ICON on the Way to Exascale - Current Status and Steps towards Sca
 lable Development
DESCRIPTION:Minisymposium\n\nClaudia Frauen (German Climate Computing Cent
 re)\n\nThe development of the weather and climate model ICON started more 
 than 20 years ago. The model has a large monolithic code base mostly writt
 en in Fortran. By using OpenACC directives the atmospheric component of th
 e model has been enabled to run successfully on (NVIDIA) GPU-based HPC sys
 tems like Piz Daint and JUWELS Booster. However, getting to run the model 
 on the AMD GPU-based system LUMI has already highlighted the limitations o
 f this strategy. Here, we will present first results on the performance an
 d code scalability of the current code-base on the pre-exascale systems LU
 MI and JUWELS Booster. Further, we will outline our strategy and show firs
 t steps towards a scalable, modularized, flexible open-source code, which 
 will enable scalable development and accelerate refactoring for performanc
 e and performance portability.\n\nDomain: Climate, Weather and Earth Scien
 ces\n\nSession Chair: Xavier Lapillonne (MeteoSwiss)
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