update cmeps for performance improvements #23
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DeniseWorthen
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Nov 9, 2020
…led model (#254) * Implements a bugfix for the mapping of ifrac for both nems_orig and nems_frac in CMEPS: issue (#17)[NOAA-EMC/CMEPS#17] * Adds field-packing for performance improvements in CMEPS: issue (#23)[NOAA-EMC/CMEPS#23] * Uses module file fv3_debug when DEBUG=Y is specified and fv3_debug is available * Shortens the nems.configure file name used with the coupled model
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Testing in CESM revealed that the mapping and merging of fields in CMEPS was inefficient. Significant performance improvement can be achieved by packing fields into an undistributed dimension of a single field, performing the required mapping and merging on the single field and then unpacking the fields for export to the relevant component. If a field has an undistributed dimension, the packed field accordions out to accommodate the field's undistributed dimension.
Additional performance enhancements can also be achieved through ESMF itself (currently in development). These ESMF related changes are not required to implement the field packing.
The field packing performance improvement is expected to be b4b with previous answers.
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