H5Pset_alignment(hid_t plist,
hsize_t threshold,
hsize_t alignment
)
H5Pset_alignment sets the alignment properties
of a file access property list
so that any file object greater than or equal in size to
threshold bytes will be aligned on an address
which is a multiple of alignment. The addresses
are relative to the end of the user block; the alignment is
calculated by subtracting the user block size from the
absolute file address and then adjusting the address to be a
multiple of alignment.
Default values for threshold and
alignment are one, implying
no alignment. Generally the default values will result in
the best performance for single-process access to the file.
For MPI IO and other parallel systems, choose an alignment
which is a multiple of the disk block size.
H5F_FSPACE_STRATEGY_PAGE, then
the alignment set via this routine is ignored. The file space handling strategy is set by
H5Pset_file_space_strategy.
hid_t plist |
IN: Identifier for a file access property list. |
hsize_t threshold |
IN: Threshold value. Note that setting the threshold value to 0 (zero) has the effect of a special case, forcing everything to be aligned. |
hsize_t alignment |
IN: Alignment value. |
SUBROUTINE h5pset_alignment_f(prp_id, threshold, alignment, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: prp_id ! Property list identifier
INTEGER(HSIZE_T), INTENT(IN) :: threshold ! Threshold value
INTEGER(HSIZE_T), INTENT(IN) :: alignment ! Alignment value
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5pset_alignment_f