Delay dataset layout copy to DCPL #5537
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mattjala
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Component - C Library
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Copying the layout immediately slows down workloads that open many small datasets.
The layout copy is delayed until either a user requests the dataset's DCPL, or until the start of an operation that may need to read the layout from the DCPL.
Whether the copying of the layout has been performed yet for a dataset is tracked by a new field on
H5D_shared_t.dsets.c