Applying Domain-Specific Language Tools to Production Weather and Climate Models: Computational Performance - Deliverable D2.4

The models used in weather and climate simulation are large, complex and long-lived. It is then very difficult to adapt them to run well on supercomputers which are quickly evolving and tend to have a lifespan of only five years or so. Domain-Specific Languages (DSLs) are one solution to this problem: they enable the model developers to focus on the scientific challenges while the underlying tool chain takes responsibility for achieving good performance on a given supercomputer. This report describes the computational performance obtained through the application of the PSyclone and dusk/dawn DSL toolchains to full atmosphere and ocean models as used for weather and climate studies at various centres. These are: the UK Met Office’s LFRic atmosphere model, the NEMO ocean model, the IFS-FVM atmosphere model and the ICON atmosphere model.ESiWACE2 stands for Centre of Excellence in Simulation of Weather and Climate in Europe Phase 2. ESiWACE2 is funded by the European Union's Horizon 2020 research and innovation programme (H2020-INFRAEDI-2018-1 call) under grant agreement 823988