Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 13, issue 6
Articles | Volume 13, issue 6
https://doi.org/10.5194/gmd-13-2783-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-13-2783-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 13, issue 6
Development and technical paper
 | 
24 Jun 2020
Development and technical paper |  | 24 Jun 2020

Single-precision arithmetic in ECHAM radiation reduces runtime and energy consumption

Alessandro Cotronei and Thomas Slawig

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Short summary
We converted the radiation part of the atmospheric model ECHAM to single-precision arithmetic, using a step-by-step change in all modules. A small code portion still requires higher precision. The generated code can be easily changed from double to single precision and vice versa. The quality of the output of the single-precision version is comparable to observational data and the one of the original code. The runtime was reduced by 40 %, and the energy consumption could also be decreased.
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