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! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
! Copyright by The HDF Group. *
! All rights reserved. *
! *
! This file is part of HDF5. The full HDF5 copyright notice, including *
! terms governing use, modification, and redistribution, is contained in *
! the COPYING file, which can be found at the root of the source code *
! distribution tree, or in https://www.hdfgroup.org/licenses. *
! If you do not have access to either file, you may request a copy from *
! help@hdfgroup.org. *
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!
! Fortran parallel example. Copied from Tutorial's example program of
! dataset.f90.
PROGRAM DATASET
USE HDF5 ! This module contains all necessary modules
IMPLICIT NONE
INCLUDE 'mpif.h'
CHARACTER(LEN=10), PARAMETER :: default_fname = "sds.h5" ! Default name
CHARACTER(LEN=8), PARAMETER :: dsetname = "IntArray" ! Dataset name
CHARACTER(LEN=100) :: filename ! File name
INTEGER :: fnamelen ! File name length
INTEGER(HID_T) :: file_id ! File identifier
INTEGER(HID_T) :: dset_id ! Dataset identifier
INTEGER(HID_T) :: filespace ! Dataspace identifier in file
INTEGER(HID_T) :: plist_id ! Property list identifier
INTEGER(HSIZE_T), DIMENSION(2) :: dimsf = (/5,8/) ! Dataset dimensions.
! INTEGER, DIMENSION(7) :: dimsfi = (/5,8,0,0,0,0,0/)
! INTEGER(HSIZE_T), DIMENSION(2) :: dimsfi = (/5,8/)
INTEGER(HSIZE_T), DIMENSION(2) :: dimsfi
INTEGER, ALLOCATABLE :: data(:,:) ! Data to write
INTEGER :: rank = 2 ! Dataset rank
INTEGER :: error, error_n ! Error flags
INTEGER :: i, j
!
! MPI definitions and calls.
!
INTEGER :: mpierror ! MPI error flag
INTEGER :: comm, info
INTEGER :: mpi_size, mpi_rank
comm = MPI_COMM_WORLD
info = MPI_INFO_NULL
CALL MPI_INIT(mpierror)
CALL MPI_COMM_SIZE(comm, mpi_size, mpierror)
CALL MPI_COMM_RANK(comm, mpi_rank, mpierror)
!
! Initialize data buffer with trivial data.
!
ALLOCATE ( data(dimsf(1),dimsf(2)))
do i = 1, dimsf(2)
do j = 1, dimsf(1)
data(j,i) = j - 1 + (i-1)*dimsf(1)
enddo
enddo
!
! Initialize FORTRAN interface
!
CALL h5open_f(error)
!
! Setup file access property list with parallel I/O access.
!
CALL h5pcreate_f(H5P_FILE_ACCESS_F, plist_id, error)
CALL h5pset_fapl_mpio_f(plist_id, comm, info, error)
!
! Figure out the filename to use. If your system does not support
! getenv, comment that statement with this,
! filename = ""
CALL getenv("HDF5_PARAPREFIX", filename)
fnamelen = LEN_TRIM(filename)
if ( fnamelen == 0 ) then
filename = default_fname
else
filename = filename(1:fnamelen) // "/" // default_fname
endif
print *, "Using filename = ", filename
!
! Create the file collectively.
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file_id, error, access_prp = plist_id)
CALL h5pclose_f(plist_id, error)
!
! Create the data space for the dataset.
!
CALL h5screate_simple_f(rank, dimsf, filespace, error)
!
! Create the dataset with default properties.
!
CALL h5dcreate_f(file_id, dsetname, H5T_NATIVE_INTEGER, filespace, &
dset_id, error)
!
! Create property list for collective dataset write
!
CALL h5pcreate_f(H5P_DATASET_XFER_F, plist_id, error)
CALL h5pset_dxpl_mpio_f(plist_id, H5FD_MPIO_COLLECTIVE_F, error)
!
! For independent write use
! CALL h5pset_dxpl_mpio_f(plist_id, H5FD_MPIO_INDEPENDENT_F, error)
!
!
! Write the dataset collectively.
!
CALL h5dwrite_f(dset_id, H5T_NATIVE_INTEGER, data, dimsfi, error, &
xfer_prp = plist_id)
!
! Deallocate data buffer.
!
DEALLOCATE(data)
!
! Close resources.
!
CALL h5sclose_f(filespace, error)
CALL h5dclose_f(dset_id, error)
CALL h5pclose_f(plist_id, error)
CALL h5fclose_f(file_id, error)
! Attempt to remove the data file. Remove the line if the compiler
! does not support it.
!CALL unlink(filename)
!
! Close FORTRAN interface
!
CALL h5close_f(error)
CALL MPI_FINALIZE(mpierror)
END PROGRAM DATASET
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