H5P_SET_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 limit for est_num_entries is 64 K. The estimated average length of the anticipated link names is passed in est_name_len. The limit for est_name_len is 64 K. 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. | 