IO
ROMS uses NetCDF for all its input and output data management. The NetCDF files can be processed using the standard library developed by UNIDATA, the Parallel-IO (PIO) library developed at NCAR, or the Software for Cashing Output and Reads for Parallel I/O (SCORPIO) library intended for the DOE's Energy Exascale Earth Model System (E3SM). The SCORPIO library was forked from the PIO library several years ago and evolved separately. The generic interface for parallel I/O in ROMS works for both the PIO or SCORPIO libraries and available by activating the PIO_LIB option. However, we recommend using the PIO library because it is more efficient in processing I/O in our benchmark tests. Furthermore, parallel I/O has been available in ROMS for several years with the NetCDF4/HDF5 libraries by activating the PARALLEL_IO and HDF5 options.
