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H5P_GET_FAPL_MPIPOSIX

Returns MPI communicator information (REMOVED)

FUNCTION REMOVED: The C functions H5P_SET_FAPL_MPIPOSIX and H5P_GET_FAPL_MPIPOSIX and the corresponding Fortran subroutines have been removed from the HDF5 Library at Release 1.8.13. They remain available in earlier releases, through HDF5 Release 1.8.12.

All applications used with HDF5 Release 1.8.13 or later and that use MPI I/O should use the functions H5P_SET_FAPL_MPIO and H5P_GET_FAPL_MPIO or the corresponding Fortran subroutines.

While HDF5’s MPI-POSIX driver (H5P_SET_FAPL_MPIPOSIX and H5P_GET_FAPL_MPIPOSIX) once provided performance benefits on some systems, that is no longer the case. HDF5’s MPIO driver (H5P_SET_FAPL_MPIO and H5P_GET_FAPL_MPIO) now provides as good or better performance on all modern systems.

 

Procedure:

H5Pget_fapl_mpiposix ( fapl_id, comm, use_gpfs_hints )

Signature:

herr_t H5Pget_fapl_mpiposix(
                     hid_t fapl_id,
                     MPI_Comm *comm,
                     hbool_t *use_gpfs_hints
    )

  

Fortran90 Interface: h5pget_fapl_mpiposix_f
    
SUBROUTINE h5pget_fapl_mpiposix_f(prp_id, comm, use_gpfs, hdferr)
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: prp_id  ! Property list identifier
  INTEGER, INTENT(OUT) :: comm          ! Buffer to return communicator
  LOGICAL, INTENT(OUT) :: use_gpfs
  INTEGER, INTENT(OUT) :: hdferr        ! Error code
END SUBROUTINE h5pget_fapl_mpiposix_f
	

Parameters:
hid_t fapl_idIN: File access property list identifier
MPI_Comm *commOUT: MPI-2 communicator
hbool_t *use_gpfs_hints    OUT: Use of GPFS hints

Description:

If the file access property list is set to the H5FD_MPIPOSIX driver, H5P_GET_FAPL_MPIPOSIX returns the MPI communicator through the comm pointer, if those values are non-null.

comm is not copied, so it is valid only until the file access property list is either modified or closed.

use_gpfs_hints specifies whether to attempt to use GPFS hints when accessing this file. A value of TRUE (or 1) indicates that the hints are being used, where possible. A value of FALSE (or 0) indicates that the hints are not being used.

Returns:

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

Example:

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History:
Release    Change
1.8.13C function and Fortran subroutine removed from HDF5 at this release.
1.6.1Fortran subroutine introduced.
1.6.0use_gpfs_hints parameter added.
1.6.0C function introduced in this release.

--- Last Modified: December 04, 2017 | 08:21 AM