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WRF model has
multiple input and output streams that are bound a
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particular format
at run time
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Different
formats (NetCDF, HDF, binary I/O) are implemented
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behind a
standardized WRF I/O API
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Lower levels of
the WRF I/O software stack allow expression of a
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dataset open as
a two-stage operation: OPEN BEGIN and then
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OPEN COMMIT
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Between the OPEN
BEGIN and OPEN COMMIT the program performs
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the sequence of
writes that will constitute one frame of output to "train"
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the interface
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An implementation
of the API is free to use this information for
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optimization/bundling/etc.
or ignore it
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Higher levels of
the WRF I/O software stack provide a
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BEGIN/TRAIN/COMMIT
form of an OPEN as a single call
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