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Exploring a high-level programming model for the NWP domain using ECMWF microphysics schemes

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Publicado en:Geoscientific Model Development vol. 18, no. 2 (2025), p. 529
Autor principal: Ubbiali, Stefano
Otros Autores: Kühnlein, Christian, Schär, Christoph, Schlemmer, Linda, Schulthess, Thomas C, Staneker, Michael, Wernli, Heini
Publicado:
Copernicus GmbH
Materias:
Weather forecasting
Software
Central processing units > CPUs
Cloud microphysics
C plus plus
Computer peripherals
Hardware
Weather
Supercomputers
Python
Data assimilation
Numerical weather forecasting
Energy consumption
Ice
Parameterization
Precipitation
Forecasting models
Graphics
Infrastructure
Graphics processing units
Climate models
Microphysics
Data collection
Algorithms
Portability
Graphical representations
Climate
Clouds
Acceso en línea:Citation/Abstract
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Resumen:We explore the domain-specific Python library GT4Py (GridTools for Python) for implementing a representative physical parametrization scheme and the related tangent-linear and adjoint algorithms from the Integrated Forecasting System (IFS) of ECMWF. GT4Py encodes stencil operators in an abstract and hardware-agnostic fashion, thus enabling more concise, readable, and maintainable scientific applications. The library achieves high performance by translating the application into targeted low-level coding implementations. Here, the main goal is to study the correctness and performance portability of the Python rewrites with GT4Py against the reference Fortran code and a number of automatically and manually ported variants created by ECMWF. The present work is part of a larger cross-institutional effort to port weather and climate models to Python with GT4Py. The focus of the current work is the IFS prognostic cloud microphysics scheme, a core physical parametrization represented by a comprehensive code that takes a significant share of the total forecast model execution time. In order to verify GT4Py for numerical weather prediction (NWP) systems, we put additional emphasis on the implementation and validation of the tangent-linear and adjoint model versions which are employed in data assimilation. We benchmark all prototype codes on three European supercomputers characterized by diverse graphics processing unit (GPU) and central processing unit (CPU) hardware, node designs, software stacks, and compiler suites. Once the application is ported to Python with GT4Py, we find excellent portability, competitive GPU performance, and robust execution in all tested scenarios including with single precision.
ISSN:1991-962X
1991-9603
DOI:10.5194/gmd-18-529-2025
Fuente:Engineering Database