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mdset.F90
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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 LICENSE 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 *
! [email protected]. *
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!//////////////////////////////////////////////////////////
! writes/reads dataset by hyperslabs
!//////////////////////////////////////////////////////////
SUBROUTINE multiple_dset_write(length, do_collective, do_chunk, mpi_size, mpi_rank, nerrors)
USE HDF5
USE MPI
USE TH5_MISC
IMPLICIT NONE
INTEGER, INTENT(in) :: length ! array length
LOGICAL, INTENT(in) :: do_collective ! use collective I/O
LOGICAL, INTENT(in) :: do_chunk ! use chunking
INTEGER(KIND=MPI_INTEGER_KIND), INTENT(in) :: mpi_size ! number of processes in the group of communicator
INTEGER(KIND=MPI_INTEGER_KIND), INTENT(in) :: mpi_rank ! rank of the calling process in the communicator
INTEGER, INTENT(inout) :: nerrors ! number of errors
INTEGER :: hdferror ! HDF hdferror flag
INTEGER(hsize_t), DIMENSION(1) :: dims ! dataset dimensions
INTEGER(hsize_t), DIMENSION(1) :: cdims ! chunk dimensions
INTEGER, ALLOCATABLE :: wbuf(:) ! write buffer
INTEGER, ALLOCATABLE :: rbuf(:) ! read buffer
INTEGER(hsize_t), DIMENSION(1) :: counti ! hyperslab selection
INTEGER(hsize_t), DIMENSION(1) :: start ! hyperslab selection
INTEGER(hid_t) :: fapl_id ! file access identifier
INTEGER(hid_t) :: dxpl_id ! dataset transfer property list
INTEGER(hid_t) :: dcpl_id ! dataset creation property list
INTEGER(hid_t) :: file_id ! file identifier
INTEGER(hid_t) :: dset_id ! dataset identifier
INTEGER(hid_t) :: fspace_id ! file space identifier
INTEGER(hid_t) :: mspace_id ! memory space identifier
INTEGER(hid_t) :: driver_id ! low-level file driver identifier
INTEGER :: istart ! start position in array
INTEGER :: iend ! end position in array
INTEGER :: icount ! number of elements in array
CHARACTER(len=80) :: filename ! filename
CHARACTER(len=80) :: dsetname ! dataset name
INTEGER :: n, i
!//////////////////////////////////////////////////////////
! initialize the array data between the processes (3)
! for the 12 size array we get
! p0 = 1,2,3,4
! p1 = 5,6,7,8
! p2 = 9,10,11,12
!//////////////////////////////////////////////////////////
ALLOCATE(wbuf(0:length-1),stat=hdferror)
IF (hdferror /= 0) THEN
WRITE(*,*) 'allocate error'
RETURN
ENDIF
ALLOCATE(rbuf(0:length-1),stat=hdferror)
IF (hdferror /= 0) THEN
WRITE(*,*) 'allocate error'
RETURN
ENDIF
icount = length/mpi_size ! divide the array by the number of processes
istart = mpi_rank*icount ! start position
iend = istart + icount ! end position
!//////////////////////////////////////////////////////////
! HDF5 I/O
!//////////////////////////////////////////////////////////
dims(1) = length
cdims(1) = length/mpi_size ! define chunks as the number of processes
!//////////////////////////////////////////////////////////
! setup file access property list with parallel I/O access
!//////////////////////////////////////////////////////////
CALL h5pcreate_f(H5P_FILE_ACCESS_F, fapl_id, hdferror)
CALL check("h5pcreate_f", hdferror, nerrors)
CALL h5pset_fapl_mpio_f(fapl_id, MPI_COMM_WORLD, MPI_INFO_NULL, hdferror)
CALL check("h5pset_fapl_mpio_f", hdferror, nerrors)
CALL h5pget_driver_f(fapl_id, driver_id, hdferror)
CALL check("h5pget_driver_f", hdferror, nerrors)
IF( driver_id /= H5FD_MPIO_F) THEN
WRITE(*,*) "Wrong driver information returned"
nerrors = nerrors + 1
ENDIF
!//////////////////////////////////////////////////////////
! create the file collectively
!//////////////////////////////////////////////////////////
CALL h5_fixname_f("parf2", filename, fapl_id, hdferror)
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file_id, hdferror, access_prp = fapl_id)
CALL check("h5fcreate_f", hdferror, nerrors)
CALL h5screate_simple_f(1, dims, fspace_id, hdferror)
CALL check("h5screate_simple_f", hdferror, nerrors)
CALL h5screate_simple_f(1, dims, mspace_id, hdferror)
CALL check("h5screate_simple_f", hdferror, nerrors)
!//////////////////////////////////////////////////////////
! modify dataset creation properties to enable chunking
!//////////////////////////////////////////////////////////
CALL h5pcreate_f(H5P_DATASET_CREATE_F, dcpl_id, hdferror)
CALL check("h5pcreate_f", hdferror, nerrors)
IF (do_chunk) THEN
CALL h5pset_chunk_f(dcpl_id, 1, cdims, hdferror)
CALL check("h5pset_chunk_f", hdferror, nerrors)
ENDIF
!//////////////////////////////////////////////////////////
! create a property list for collective dataset write
!//////////////////////////////////////////////////////////
CALL h5pcreate_f(H5P_DATASET_XFER_F, dxpl_id, hdferror)
CALL check("h5pcreate_f", hdferror, nerrors)
IF (do_collective) THEN
CALL h5pset_dxpl_mpio_f(dxpl_id, H5FD_MPIO_COLLECTIVE_F, hdferror)
CALL check("h5pset_dxpl_mpio_f", hdferror, nerrors)
ENDIF
!//////////////////////////////////////////////////////////
! define hyperslab
!//////////////////////////////////////////////////////////
counti(1) = icount
start(1) = istart
!//////////////////////////////////////////////////////////
! select hyperslab in memory
!//////////////////////////////////////////////////////////
CALL h5sselect_hyperslab_f(mspace_id, H5S_SELECT_SET_F, start, counti, hdferror)
CALL check("h5sselect_hyperslab_f", hdferror, nerrors)
!//////////////////////////////////////////////////////////
! select hyperslab in the file
!//////////////////////////////////////////////////////////
CALL h5sselect_hyperslab_f(fspace_id, H5S_SELECT_SET_F, start, counti, hdferror)
CALL check("h5sselect_hyperslab_f", hdferror, nerrors)
!//////////////////////////////////////////////////////////
! create and write the datasets
!//////////////////////////////////////////////////////////
DO n = 1, 300
! direct the output of the write statement to unit "dsetname"
WRITE(dsetname,*) 'dataset', n
! create this dataset
CALL h5dcreate_f(file_id, dsetname, H5T_NATIVE_INTEGER, fspace_id, dset_id, hdferror, dcpl_id)
CALL check("h5dcreate_f", hdferror, nerrors)
DO i = istart, iend-1
wbuf(i) = n + mpi_rank
ENDDO
! write this dataset
CALL h5dwrite_f(dset_id,H5T_NATIVE_INTEGER,wbuf,dims,hdferror,file_space_id=fspace_id,mem_space_id=mspace_id,xfer_prp=dxpl_id)
CALL check("h5dwrite_f", hdferror, nerrors)
! close this dataset
CALL h5dclose_f(dset_id, hdferror)
CALL check("h5dclose_f", hdferror, nerrors)
ENDDO
!//////////////////////////////////////////////////////////
! close HDF5 I/O
!//////////////////////////////////////////////////////////
CALL h5pclose_f(fapl_id, hdferror)
CALL check("h5pclose_f", hdferror, nerrors)
CALL h5pclose_f(dcpl_id, hdferror)
CALL check("h5pclose_f", hdferror, nerrors)
CALL h5pclose_f(dxpl_id, hdferror)
CALL check("h5pclose_f", hdferror, nerrors)
CALL h5sclose_f(mspace_id, hdferror)
CALL check("h5sclose_f", hdferror, nerrors)
CALL h5sclose_f(fspace_id, hdferror)
CALL check("h5sclose_f", hdferror, nerrors)
CALL h5fclose_f(file_id, hdferror)
CALL check("h5fclose_f", hdferror, nerrors)
!//////////////////////////////////////////////////////////
! reopen file with read access
!//////////////////////////////////////////////////////////
CALL h5pcreate_f(H5P_FILE_ACCESS_F, fapl_id, hdferror)
CALL check("h5pcreate_f", hdferror, nerrors)
CALL h5pset_fapl_mpio_f(fapl_id, MPI_COMM_WORLD, MPI_INFO_NULL, hdferror)
CALL check("h5pset_fapl_mpio_f", hdferror, nerrors)
CALL h5fopen_f(filename, H5F_ACC_RDWR_F, file_id, hdferror, access_prp = fapl_id)
CALL check("h5fopen_f", hdferror, nerrors)
CALL h5screate_simple_f(1, dims, fspace_id, hdferror)
CALL check("h5screate_simple_f", hdferror, nerrors)
CALL h5screate_simple_f(1, dims, mspace_id, hdferror)
CALL check("h5screate_simple_f", hdferror, nerrors)
!//////////////////////////////////////////////////////////
! select hyperslab in memory
!//////////////////////////////////////////////////////////
CALL h5sselect_hyperslab_f(mspace_id, H5S_SELECT_SET_F, start, counti, hdferror)
CALL check("h5sselect_hyperslab_f", hdferror, nerrors)
!//////////////////////////////////////////////////////////
! select hyperslab in the file
!//////////////////////////////////////////////////////////
CALL h5sselect_hyperslab_f(fspace_id, H5S_SELECT_SET_F, start, counti, hdferror)
CALL check("h5sselect_hyperslab_f", hdferror, nerrors)
!//////////////////////////////////////////////////////////
! create a property list for collective dataset read
!//////////////////////////////////////////////////////////
CALL h5pcreate_f(H5P_DATASET_XFER_F, dxpl_id, hdferror)
CALL check("h5pcreate_f", hdferror, nerrors)
IF (do_collective) THEN
CALL h5pset_dxpl_mpio_f(dxpl_id, H5FD_MPIO_COLLECTIVE_F, hdferror)
CALL check("h5pset_dxpl_mpio_f", hdferror, nerrors)
ENDIF
!//////////////////////////////////////////////////////////
! read dataset
!//////////////////////////////////////////////////////////
DO n = 1, 300
! direct the output of the write statement to unit "dsetname"
WRITE(dsetname,*) 'dataset', n
! create this dataset
CALL h5dopen_f(file_id, dsetname, dset_id, hdferror)
CALL check("h5dopen_f", hdferror, nerrors)
! read this dataset
CALL h5dread_f(dset_id,H5T_NATIVE_INTEGER,rbuf,dims,hdferror,file_space_id=fspace_id,mem_space_id=mspace_id,xfer_prp=dxpl_id)
CALL check("h5dread_f", hdferror, nerrors)
! close this dataset
CALL h5dclose_f(dset_id, hdferror)
CALL check("h5dclose_f", hdferror, nerrors)
DO i = istart, iend-1
wbuf(i) = n + mpi_rank
ENDDO
! compare read and write data. each process compares a subset of the array
DO i = istart, iend-1
IF( wbuf(i) /= rbuf(i)) THEN
WRITE(*,*) 'buffers differs at ', i, rbuf(i), wbuf(i)
nerrors = nerrors + 1
ENDIF
ENDDO
ENDDO
!//////////////////////////////////////////////////////////
! close HDF5 I/O
!//////////////////////////////////////////////////////////
CALL h5pclose_f(fapl_id, hdferror)
CALL check("h5pclose_f", hdferror, nerrors)
CALL h5pclose_f(dxpl_id, hdferror)
CALL check("h5pclose_f", hdferror, nerrors)
CALL h5sclose_f(fspace_id, hdferror)
CALL check("h5sclose_f", hdferror, nerrors)
CALL h5sclose_f(mspace_id, hdferror)
CALL check("h5sclose_f", hdferror, nerrors)
CALL h5fclose_f(file_id, hdferror)
CALL check("h5fclose_f", hdferror, nerrors)
DEALLOCATE(wbuf)
DEALLOCATE(rbuf)
END SUBROUTINE multiple_dset_write