H5P_SET_HYPER_VECTOR_SIZE

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Sets number of I/O vectors to be read/written in hyperslab I/O

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H5P_SET_HYPER_VECTOR_SIZE ( dxpl_id, vector_size )

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<pre><code class="language-c">herr_t H5Pset_hyper_vector_size(hid_t dxpl_id, size_t vector_size ) </code></pre>

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<pre><code class="language-fortran">Fortran90 Interface: h5pset_hyper_vector_size_f
    
SUBROUTINE h5pset_hyper_vector_size_f(plist_id, size, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: plist_id ! Dataset transfer property list 
                                         ! identifier
  INTEGER(SIZE_T), INTENT(IN) :: size    ! Vector size 
  INTEGER, INTENT(OUT)       :: hdferr   ! Error code
                                         ! 0 on success and -1 on failure
END SUBROUTINE h5pset_hyper_vector_size_f
	</code></pre>

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hid_t dxpl_id IN: Dataset transfer property list identifier

size_t vector_size

IN: Number of I/O vectors to accumulate in memory for I/O operations

Must be greater than 1 (one)

Default value: 1024

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H5P_SET_HYPER_VECTOR_SIZE sets the number of I/O vectors to be accumulated in memory before being issued to the lower levels of the HDF5 library for reading or writing the actual data.

The I/O vectors are hyperslab offset and length pairs and are generated during hyperslab I/O.

The number of I/O vectors is passed in vector_size to be set in the dataset transfer property list dxpl_id. vector_size must be greater than 1 (one).

H5P_SET_HYPER_VECTOR_SIZE is an I/O optimization function; increasing vector_size should provide better performance, but the library will use more memory during hyperslab I/O. The default value of vector_size is 1024.

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

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