Articles | Volume 13, issue 4
Development and technical paper
16 Apr 2020
Development and technical paper |  | 16 Apr 2020

Parallel I∕O in Flexible Modelling System (FMS) and Modular Ocean Model 5 (MOM5)

Rui Yang, Marshall Ward, and Ben Evans

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Cited articles

Bartz, C., Chasapis, K., Kuhn, M., Nerge, P., and Ludwig, T.: A Best Practice Analysis of HDF5 and NetCDF-4 Using Lustre, ISC 2015,, 2015. 
Dennis, J. M., Edwards, J., Loy, R., Jacob, R., Mirin, A. A., Craig, A. P., and Vertenstein, M.: An application-level parallel I∕O library for Earth system models, The Int. J. High Perform. Comput. Appl., 26, 43–56,, 2011. 
Dickens, P. and Logan, J.: Towards a high performance implementation of MPI-IO on the Lustre file system, On the Move to Meaningful Internet Systems: OTM 2008 LNCS 5331, 870–885,, 2008. 
Edwards, J., Dennis, J. M., Vertenstein, M., and Hartnett, E.: PIO library, available at: (last access: March 2020), 2019. 
Griffies, S. M.: Elements of the Modular Ocean Model (MOM), GFDL Ocean Group Technical Report No. 7, NOAA/Geophysical Fluid Dynamics Laboratory, 620, available at (last access: April 2020), 2012–2020. 
Short summary
Parallel I/O is implemented in the Modular Ocean Model (MOM) with optimal performance over a range of tuning parameters of model configuration, netCDF, MPI-IO and Lustre filesystem. The scalable parallel I/O performance is observed at 0.1° resolution global model, and it could achieve up to 60 times faster in write speed relative to serial single-file I/O running on 960 PEs.