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Excerpt

Stores MPI IO communicator information to the file access property list

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Procedure:
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H5P_SET_FAPL_MPIO ( fapl_id, comm, info )

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<pre><code class="language-c">herr_t H5Pset_fapl_mpio(
                     hid_t fapl_id,
                     MPI_Comm comm,
                     MPI_Info info
    )
  </code></pre>
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<pre><code class="language-fortran">Fortran90 Interface: h5pset_fapl_mpio_f
    
SUBROUTINE h5pset_fapl_mpio_f(prp_id, comm, info, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: prp_id  ! Property list identifier
  INTEGER, INTENT(IN) :: comm           ! MPI communicator to be used for 
                                        ! file open as defined in 
                                        ! MPI_FILE_OPEN of MPI-2
  INTEGER, INTENT(IN) :: info           ! MPI info object to be used for 
                                        ! file open as defined in 
                                        ! MPI_FILE_OPEN of MPI-2
  INTEGER, INTENT(OUT) :: hdferr        ! Error code
                                        ! 0 on success and -1 on failure
END SUBROUTINE h5pset_fapl_mpio_f
    </code></pre>

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Parameters:
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hid_t fapl_idIN: File access property list identifier
MPI_Comm comm    IN: MPI-2 communicator
MPI_Info infoIN: MPI-2 info object

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Description:
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H5P_SET_FAPL_MPIO stores the user-supplied MPI IO parameters comm, for communicator, and info, for information, in the file access property list fapl_id. That property list can then be used to create and/or open a file.

H5P_SET_FAPL_MPIO is available only in the parallel HDF5 library and is not a collective function.

comm is the MPI communicator to be used for file open, as defined in MPI_FILE_OPEN of MPI-2. This function makes a duplicate of the communicator, so modifications to comm after this function call returns have no effect on the file access property list.

info is the MPI Info object to be used for file open, as defined in MPI_FILE_OPEN of MPI-2. This function makes a duplicate copy of the Info object, so modifications to the Info object after this function call returns will have no effect on the file access property list.

If the file access property list already contains previously-set communicator and Info values, those values will be replaced and the old communicator and Info object will be freed.

Note

Raw dataset chunk caching is not currently supported when using this file driver in read/write mode. All calls to H5D_READand READ and H5D_WRITE will access the disk directly, and H5P_SET_CACHE and H5P_SET_CHUNK_CACHE will have no effect on performance.

Raw dataset chunk caching is supported when this driver is used in read-only mode.

 

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Returns:
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Returns a non-negative value if successful. Otherwise returns a negative value.

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History:
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Release    Change
1.4.5Handling of the MPI Communicator and Info object changed at this release. A duplicate of each of these is now stored in the property list instead of pointers to each.
1.4.0C function introduced in this release.