1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
! Copyright by The HDF Group. *
! Copyright by the Board of Trustees of the University of Illinois. *
! 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
|
