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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. *
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!
! writes/reads dataset by hyperslabs using multi-dataset routines, h5dread_multi and
! h5dwrite_multi
!
SUBROUTINE pmultiple_dset_hyper_rw(do_collective, do_chunk, mpi_size, mpi_rank, nerrors)
USE iso_c_binding
USE TH5_MISC
USE hdf5
USE mpi
IMPLICIT NONE
LOGICAL, INTENT(in) :: do_collective ! use collective IO
LOGICAL, INTENT(in) :: do_chunk ! use chunking
INTEGER, INTENT(in) :: mpi_size ! number of processes in the group of communicator
INTEGER, INTENT(in) :: mpi_rank ! rank of the calling process in the communicator
INTEGER, INTENT(inout) :: nerrors ! number of errors
CHARACTER(LEN=80):: dsetname ! Dataset name
INTEGER(hsize_t), DIMENSION(1:2) :: cdims ! chunk dimensions
INTEGER(HID_T) :: file_id ! File identifier
INTEGER(HID_T) :: filespace ! Dataspace identifier in file
INTEGER(HID_T) :: memspace ! Dataspace identifier in memory
INTEGER(HID_T) :: plist_id ! Property list identifier
INTEGER(HID_T) :: dcpl_id ! Dataset creation property list
INTEGER(HSIZE_T), DIMENSION(1:2) :: dimsf ! Dataset dimensions.
INTEGER(HSIZE_T), DIMENSION(1:2) :: count
INTEGER(HSSIZE_T), DIMENSION(1:2) :: offset
INTEGER, ALLOCATABLE, DIMENSION(:,:,:), TARGET :: DATA ! Data to write
INTEGER, ALLOCATABLE, DIMENSION(:,:,:), TARGET :: rDATA ! Data to write
INTEGER, PARAMETER :: rank = 2 ! Dataset rank
INTEGER :: i
INTEGER(HSIZE_T) :: ii, jj, kk, istart
INTEGER :: error ! Error flags
INTEGER(SIZE_T), PARAMETER :: ndsets = 5
INTEGER(HID_T), DIMENSION(1:ndsets) :: dset_id
INTEGER(HID_T), DIMENSION(1:ndsets) :: mem_type_id
INTEGER(HID_T), DIMENSION(1:ndsets) :: mem_space_id
INTEGER(HID_T), DIMENSION(1:ndsets) :: file_space_id
TYPE(C_PTR), DIMENSION(1:ndsets) :: buf_md
INTEGER(SIZE_T) :: obj_count
INTEGER :: data_xfer_mode
dimsf(1) = 5_hsize_t
dimsf(2) = INT(mpi_size, hsize_t)*8_hsize_t
!
! Setup file access property list with parallel I/O access.
!
CALL h5pcreate_f(H5P_FILE_ACCESS_F, plist_id, error)
CALL check("h5pcreate_f", error, nerrors)
CALL h5pset_fapl_mpio_f(plist_id, MPI_COMM_WORLD, MPI_INFO_NULL, error)
CALL check("h5pset_fapl_mpio_f", error, nerrors)
!
! Create the file collectively.
!
CALL h5fcreate_f("parf2.h5", H5F_ACC_TRUNC_F, file_id, error, access_prp = plist_id)
CALL check("h5fcreate_f", error, nerrors)
CALL h5pclose_f(plist_id, error)
CALL check("h5pclose_f", error, nerrors)
!
! Create the data space for the dataset.
!
CALL h5screate_simple_f(rank, dimsf, filespace, error)
CALL check("h5screate_simple_f", error, nerrors)
!
! Each process defines dataset in memory and writes it to the hyperslab
! in the file.
!
count(1) = dimsf(1)
count(2) = dimsf(2)/mpi_size
offset(1) = 0
offset(2) = mpi_rank * count(2)
CALL h5screate_simple_f(rank, count, memspace, error)
CALL check("h5screate_simple_f", error, nerrors)
!
! Modify dataset creation properties to enable chunking
!
CALL h5pcreate_f(H5P_DATASET_CREATE_F, dcpl_id, error)
CALL check("h5pcreate_f", error, nerrors)
IF (do_chunk) THEN
cdims(1) = dimsf(1)
cdims(2) = dimsf(2)/mpi_size/2
CALL h5pset_chunk_f(dcpl_id, 2, cdims, error)
CALL check("h5pset_chunk_f", error, nerrors)
ENDIF
!
! Select hyperslab in the file.
!
CALL h5sselect_hyperslab_f(filespace, H5S_SELECT_SET_F, offset, count, error)
CALL check("h5sselect_hyperslab_f", error, nerrors)
!
! Initialize data buffer
!
ALLOCATE ( DATA(COUNT(1),COUNT(2), ndsets))
ALLOCATE ( rdata(COUNT(1),COUNT(2), ndsets))
! Create property list for collective dataset write
!
CALL h5pcreate_f(H5P_DATASET_XFER_F, plist_id, error)
CALL check("h5pcreate_f", error, nerrors)
IF(do_collective)THEN
CALL h5pset_dxpl_mpio_f(plist_id, H5FD_MPIO_COLLECTIVE_F, error)
CALL check("h5pset_dxpl_mpio_f", error, nerrors)
ELSE
CALL h5pset_dxpl_mpio_f(plist_id, H5FD_MPIO_INDEPENDENT_F, error)
CALL check("h5pset_dxpl_mpio_f", error, nerrors)
ENDIF
!
! Create the dataset with default properties.
!
mem_type_id(1:ndsets) = H5T_NATIVE_INTEGER
mem_space_id(1:ndsets) = memspace
file_space_id(1:ndsets)= filespace
DO ii = 1, ndsets
! Create the data
DO kk = 1, COUNT(1)
DO jj = 1, COUNT(2)
istart = (kk-1)*dimsf(2) + mpi_rank*COUNT(2)
DATA(kk,jj,ii) = INT((istart + jj)*10**(ii-1))
ENDDO
ENDDO
! Point to te data
buf_md(ii) = C_LOC(DATA(1,1,ii))
! direct the output of the write statement to unit "dsetname"
WRITE(dsetname,'("dataset ",I0)') ii
! create the dataset
CALL h5dcreate_f(file_id, dsetname, H5T_NATIVE_INTEGER, filespace, dset_id(ii), error, dcpl_id)
CALL check("h5dcreate_f", error, nerrors)
ENDDO
!
! Write the dataset collectively.
!
CALL h5dwrite_multi_f(ndsets, dset_id, mem_type_id, mem_space_id, file_space_id, buf_md, error, plist_id)
CALL check("h5dwrite_multi_f", error, nerrors)
CALL h5pget_dxpl_mpio_f(plist_id, data_xfer_mode, error)
CALL check("h5pget_dxpl_mpio_f", error, nerrors)
IF(do_collective)THEN
IF(data_xfer_mode.NE.H5FD_MPIO_COLLECTIVE_F)THEN
nerrors = nerrors + 1
ENDIF
ENDIF
DO i = 1, ndsets
! Point to the read buffer
buf_md(i) = C_LOC(rdata(1,1,i))
ENDDO
CALL H5Dread_multi_f(ndsets, dset_id, mem_type_id, mem_space_id, file_space_id, buf_md, error, plist_id)
CALL check("h5dread_multi_f", error, nerrors)
CALL h5pget_dxpl_mpio_f(plist_id, data_xfer_mode, error)
CALL check("h5pget_dxpl_mpio_f", error, nerrors)
IF(do_collective)THEN
IF(data_xfer_mode.NE.H5FD_MPIO_COLLECTIVE_F)THEN
nerrors = nerrors + 1
ENDIF
ENDIF
DO i = 1, ndsets
! Close all the datasets
CALL h5dclose_f(dset_id(i), error)
CALL check("h5dclose_f", error, nerrors)
ENDDO
! check the data read and write buffers
DO ii = 1, ndsets
! Create the data
DO kk = 1, COUNT(1)
DO jj = 1, COUNT(2)
IF(rDATA(kk,jj,ii).NE.DATA(kk,jj,ii))THEN
nerrors = nerrors + 1
ENDIF
ENDDO
ENDDO
ENDDO
!
! Deallocate data buffer.
!
DEALLOCATE(data, rdata)
!
! Close dataspaces.
!
CALL h5sclose_f(filespace, error)
CALL check("h5sclose_f", error, nerrors)
CALL h5sclose_f(memspace, error)
CALL check("h5sclose_f", error, nerrors)
!
! Close the dataset and property list.
!
CALL h5pclose_f(dcpl_id, error)
CALL check("h5pclose_f", error, nerrors)
CALL h5pclose_f(plist_id, error)
CALL check("h5pclose_f", error, nerrors)
CALL h5fget_obj_count_f(file_id, H5F_OBJ_ALL_F, obj_count, error)
IF(obj_count.NE.1)THEN
nerrors = nerrors + 1
END IF
!
! Close the file.
!
CALL h5fclose_f(file_id, error)
CALL check("h5fclose_f", error, nerrors)
END SUBROUTINE pmultiple_dset_hyper_rw
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