- Created by Barbara Jones, last modified on Jul 25, 2019
H5P_SET_FAPL_MPIO
Stores MPI IO communicator information to the file access property list
Procedure:
H5P_SET_FAPL_MPIO ( fapl_id, comm, info )
Signature:
herr_t H5Pset_fapl_mpio(
hid_t fapl_id,
MPI_Comm comm,
MPI_Info info
)
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
Parameters:
hid_t fapl_id | IN: File access property list identifier |
MPI_Comm comm | IN: MPI-2 communicator |
MPI_Info info | IN: MPI-2 info object |
Description:
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.
Raw dataset chunk caching is not currently supported when using this file driver in read/write mode. All calls to H5D_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.
Returns:
Returns a non-negative value if successful. Otherwise returns a negative value.
Example:
Coming Soon!
History:
| Release | Change |
|---|---|
| 1.4.5 | Handling 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. |
| 1.4.0 | C function introduced in this release. |
--- Last Modified: July 25, 2019 | 03:03 PM