H5P_SET_COLL_METADATA_WRITE tells the HDF5 library whether to perform metadata writes collectively (
1) or independently (
If collective access is selected, then on a flush of the metadata cache, all processes will divide the metadata cache entries to be flushed evenly among themselves and issue a single MPI-IO collective write operation. This is the preferred method when the size of the metadata created by the application is large.
If independent access is selected, the library uses the default method for doing metadata I/O either from process zero or independently from each process.