Development and performance of a new version of the OASIS coupler, OASIS3-MCT_3.0

• Published in: Geoscientific Model Development Vol. 10; no. 9; pp. 3297 - 3308
• Main Authors: Craig, Anthony, Valcke, Sophie, Coquart, Laure
• Format: Journal Article
• Language: English
• Published: Katlenburg-Lindau Copernicus GmbH 08-09-2017; European Geosciences Union; Copernicus Publications
• Subjects: Climate models; Communication; Components; Couplers; Coupling; Dynamics; Environmental Sciences; Evaluation; High resolution; Infrastructure; Interpolation; Laboratories; Libraries; Mapping; Mathematical models; Meteorological research; Numerical models; Oases; Physics; Scientific software; Software; Technology application; France
• ISSN: 1991-9603; 1991-959X; 1991-962X; 1991-9603; 1991-962X; 1991-959X
• DOI: 10.5194/gmd-10-3297-2017

OASIS is coupling software developed primarily for use in the climate community. It provides the ability to couple different models with low implementation and performance overhead. OASIS3-MCT is the latest version of OASIS. It includes several improvements compared to OASIS3, including elimination of a separate hub coupler process, parallelization of the coupling communication and run-time grid interpolation, and the ability to easily reuse mapping weight files. OASIS3-MCT_3.0 is the latest release and includes the ability to couple between components running sequentially on the same set of tasks as well as to couple within a single component between different grids or decompositions such as physics, dynamics, and I/O. OASIS3-MCT has been tested with different configurations on up to 32 000 processes, with components running on high-resolution grids with up to 1.5 million grid cells, and with over 10 000 2-D coupling fields. Several new features will be available in OASIS3-MCT_4.0, and some of those are also described.