Enable auto IO LAYOUT (via FMS parallel IO) #235
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This was referenced Mar 4, 2025
alperaltuntas
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jedwards4b
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Mar 5, 2025
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This is one of three PRs to enable automated parallel IO in MOM6 within CESM by making use of the existing parallel IO implementation that comes with FMS. These series of PRs (1) enable FMS parallel IO, (2) make sure the IO PE Layout is compatible with auto-land block elimination (i.e., masking), and (3) that partitioned files are automatically merged after a run is completed.
Changes:
MOM_input, set a default value forTARGET_IO_PESto enable FMS parallel IO fortx2_3v2andtx0.25v1.input.nml, turn on auto merging of partitioned netcdf files by setting the newly added parameterauto_merge_nc.testing: aux_mom.derecho
status: b4b, except for masking in static files due to changing compute layout.
Performance: varies depending on the resolution, pe count and IO layout, from no enhancement or degradation to more than 50% enhancement.
This PR should be evaulated in conjunction with:
NCAR/MOM6#342
ESCOMP/FMS#5