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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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GMD | Articles | Volume 13, issue 6
Geosci. Model Dev., 13, 2783–2804, 2020
https://doi.org/10.5194/gmd-13-2783-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Geosci. Model Dev., 13, 2783–2804, 2020
https://doi.org/10.5194/gmd-13-2783-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

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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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Thomas Slawig on behalf of the Authors (23 Apr 2020)  Author's response    Manuscript
ED: Publish as is (14 May 2020) by David Topping
AR by Thomas Slawig on behalf of the Authors (22 May 2020)  Author's response    Manuscript
Publications Copernicus
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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.
We converted the radiation part of the atmospheric model ECHAM to single-precision arithmetic,...
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