Stop using file striping size to automatically set header extent size #124
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PnetCDF does not support file offset alignment for individual variables. The alignment is for the entire fixed-size variable section of the entire record variable section.
Automatically set the size of file header extent using the file striping size obtained from MPI-IO hint striping_unit may yield an unexpectedly large file header extent and cause movement of data sections if new metadata is added when the program re-enter the define mode. With this commit, file striping size will no longer be used to set the file header alignment size. However, users can still set nc_header_align_size in PNETCDF_HINTS environment variable or v_align in ncmpi__enddef() to customize the size of header extent.
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Automatically set the size of file header extent using the file striping
size obtained from MPI-IO hint striping_unit may yield an unexpectedly
large file header extent and cause movement of data sections if new
metadata is added when the program re-enter the define mode. With this
commit, file striping size will no longer be used to set the file header
alignment size. However, users can still set nc_header_align_size in
PNETCDF_HINTS environment variable or v_align in ncmpi__enddef() to
customize the size of header extent.