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Implemented new I/O package (mdsio.F). This package does parallel I/O in much the same way as dfile.F used to except it uses "direct access" rather than (f77) unformatted sequential access. Problems with dfile.F package included: o unnecessary memory use (each process had two global sized buffers) o inability to read the files it had written without post-processing o "tiled" files were tiled by process/thread rather than actual tiles o created huge numbers of files with no alternatives Features of the mdsio.F package: o direct-access binary writes o no excessive memory use o ability to read/write from multiple record files o "tiled" files are based on "WRAPPER" tiles so that the number and content of files is independent of the number of threads and/or processes o option to create single "global" files rather than "tiled" files o ability to read both "global" and "tiled" files [Caveat: the tiling of files must match the model tiles] o checkpoints now use a single file per model section ie. one file for the hydrostatic model core, one file for the non-hydrostatic extensions and one file for the C-D extensions o the mid-level I/O routines now is broken into more source files read_write_fld.F supplies basic I/O routines with the same interface as the original I/O package read_write_rec.F supplies I/O routines which allow multiple records write_state.F writes the model state checkpoint.F supplies the read/write checkpoint routines All the example input data has had to be modified to be direct-access. Otherwise only routines that used I/O have been affected and not all of those have been due to the continuity of arguments in the read_write_fld.F routines. What needs to be done? We have to create a suite of conversion utilities for users with old-style data. Also supply the option for using old-style I/O, not just for die-hards but for reading data too extensive to be converted. And more...
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