H5Pset_est_link_info
(
hid_t gcpl_id
,
unsigned est_num_entries
,
unsigned est_name_len
)
H5Pset_est_link_info
inserts two settings into
the group creation property list gcpl_id
:
the estimated number of links that are expected to be inserted into
a group created with the property list and the
estimated average length of those link names.
The estimated number of links is passed in est_num_entries
.
The estimated average length of the anticipated link names
is passed in est_name_len
.
The values for these two settings are multiplied to compute the initial local heap size (for old-style groups, if the local heap size hint is not set) or the initial object header size for (new-style compact groups; see “Group implementations in HDF5”). Accurately setting these parameters will help reduce wasted file space.
If a group is expected to have many links and to be stored in
dense format, set est_num_entries
to 0
(zero) for maximum efficiency.
This will prevent the group from being created in the compact format.
See “Group implementations in HDF5” in the H5G API introduction for a discussion of the available types of HDF5 group structures.
hid_t gcpl_id |
IN: Group creation property list identifier |
unsigned est_num_entries |
IN: Estimated number of links to be inserted into group |
unsigned est_name_len |
IN: Estimated average length of link names |
SUBROUTINE H5Pset_est_link_info_f(gcpl_id, est_num_entries, est_name_len, & hdferr) IMPLICIT NONE INTEGER(HID_T), INTENT(IN) :: gcpl_id ! Group creation property list identifier INTEGER, INTENT(IN) :: est_num_entries ! Estimated number of links to be ! inserted into group INTEGER, INTENT(IN) :: est_name_len ! Estimated average length of link names INTEGER, INTENT(OUT) :: hdferr ! Error code ! 0 on success and -1 on failure END SUBROUTINE H5Pset_est_link_info_f
Release | C |
1.8.0 | Function introduced in this release. |