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H5P_SET_LOCAL_HEAP_SIZE_HINT

Specifies the anticipated maximum size of a local heap

Procedure:

H5P_SET_LOCAL_HEAP_SIZE_HINT ( gcpl_id, size_hint )

Signature:

herr_t H5Pset_local_heap_size_hint(
        hid_t gcpl_id,
        size_t size_hint
    )
  

Replace this text with the C++ Function Signature

Replace this text with the JAVA Function Signature

Parameters:
hid_t gcpl_idIN: Group creation property list identifier
size_t size_hint    IN: Anticipated maximum size in bytes of local heap

Description:

H5Pset_local_heap_size_hint is used with original-style HDF5 groups (see “Motivation” below) to specify the anticipated maximum local heap size, size_hint, for groups created with the group creation property list gcpl_id. The HDF5 Library then uses size_hint to allocate contiguous local heap space in the file for each group created with gcpl_id.

For groups with many members or very few members, an appropriate initial value of size_hint would be the anticipated number of group members times the average length of group member names, plus a small margin:

          size_hint = max_number_of_group_members  * 
                      (average_length_of_group_member_link_names + 2)
      

If it is known that there will be groups with zero members, the use of a group creation property list with size_hint set to to 1 (one) will guarantee the smallest possible local heap for each of those groups.

Setting size_hint to zero (0) causes the library to make a reasonable estimate for the default local heap size.

Returns:

Returns a non-negative value if successful; otherwise returns a negative value.

Example:

examples / h5_subset.c [32:42]  1.10/master  HDFFV/hdf5
int
main (void)
{
    hsize_t     dims[2], dimsm[2];   
    int         data[DIM0][DIM1];           /* data to write */
    int         sdata[DIM0_SUB][DIM1_SUB];  /* subset to write */
    int         rdata[DIM0][DIM1];          /* buffer for read */
 
    hid_t       file_id, dataset_id;        /* handles */
    hid_t       dataspace_id, memspace_id; 

     PROGRAM COMPOUNDEXAMPLE

     USE HDF5 ! This module contains all necessary modules

     IMPLICIT NONE

     CHARACTER(LEN=11), PARAMETER :: filename = "compound.h5" ! File name
     CHARACTER(LEN=8), PARAMETER :: dsetname = "Compound"     ! Dataset name
     INTEGER, PARAMETER :: dimsize = 6 ! Size of the dataset

     INTEGER(HID_T) :: file_id       ! File identifier

c++ / examples / create.cpp [33:43]  1.10/master  HDFFV/hdf5
int main (void)
{
   /*
    * Data initialization.
    */
   int i, j;
   int data[NX][NY];          // buffer for data to write
   for (j = 0; j < NX; j++)
   {
      for (i = 0; i < NY; i++)

public class H5Ex_D_Chunk {
    private static String FILENAME = "H5Ex_D_Chunk.h5";
    private static String DATASETNAME = "DS1";
    private static final int DIM_X = 6;
    private static final int DIM_Y = 8;
    private static final int CHUNK_X = 4;
    private static final int CHUNK_Y = 4;
    private static final int RANK = 2;
    private static final int NDIMS = 2;

History:
Release    Change
1.8.0Function introduced in this release.

--- Last Modified: November 21, 2017 | 11:46 AM