86 lines
2.6 KiB
Fortran
86 lines
2.6 KiB
Fortran
!
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! Copyright (c) 2006-2015, The Regents of the University of California,
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! through Lawrence Berkeley National Laboratory (subject to receipt of any
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! required approvals from the U.S. Dept. of Energy) and the Paul Scherrer
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! Institut (Switzerland). All rights reserved.!
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!
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! License: see file COPYING in top level of source distribution.
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!
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include 'H5hut.f90'
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program read_stridedf
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use H5hut
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implicit none
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#if defined(PARALLEL_IO)
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include 'mpif.h'
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#endif
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! name of input file
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character (len=*), parameter :: fname = "example_strided.h5"
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! H5hut verbosity level
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integer*8, parameter :: h5_verbosity = H5_VERBOSE_DEFAULT
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integer*8 :: file, h5_ierror
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integer*8 :: num_particles, num_particles_total
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real*8, allocatable :: data(:)
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integer*8 :: i, start
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! initialize MPI & H5hut
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#if defined(PARALLEL_IO)
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integer :: comm, comm_size, comm_rank, mpi_ierror
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comm = MPI_COMM_WORLD
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call mpi_init (mpi_error)
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call mpi_comm_size (comm, comm_size, mpi_ierror)
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call mpi_comm_rank (comm, comm_rank, mpi_ierror)
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#else
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integer :: comm_size = 1
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integer :: comm_rank = 0
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#endif
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call h5_abort_on_error ()
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call h5_set_verbosity_level (h5_verbosity)
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! open file and go to first step
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file = h5_openfile (fname, H5_O_RDONLY, H5_PROP_DEFAULT)
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h5_ierror = h5_setstep(file, 1_8)
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! compute number of particles this process has to read
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num_particles_total = h5pt_getnpoints (file)
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num_particles = num_particles_total / comm_size
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if (comm_rank+1 == comm_size) then
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num_particles = num_particles + mod (num_particles_total, comm_size)
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end if
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write (*, "('Total number of particles: ', i8)") num_particles_total
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write (*, "('Number of particles on this core: ', i8)") num_particles
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! set number of particeles and memory stride
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h5_ierror = h5pt_setnpoints_strided (file, num_particles, 6_8)
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! read data
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allocate (data (6*num_particles))
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h5_ierror = h5pt_readdata_r8 (file, "x", data(1:))
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h5_ierror = h5pt_readdata_r8 (file, "y", data(2:))
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h5_ierror = h5pt_readdata_r8 (file, "z", data(3:))
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h5_ierror = h5pt_readdata_r8 (file, "px", data(4:))
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h5_ierror = h5pt_readdata_r8 (file, "py", data(5:))
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h5_ierror = h5pt_readdata_r8 (file, "pz", data(6:))
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! print dataset "x"
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start = 1
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do i = start, num_particles*6, 6
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write (*, "('[proc ', i4, ']: global index = ', i4, '; local index = ', i4, ', value = ', f10.2)") &
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comm_rank, start+i-2, i, data(i)
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end do
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! cleanup
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deallocate (data)
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h5_ierror = h5_closefile (file)
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#if defined(PARALLEL_IO)
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call mpi_finalize (mpi_ierror)
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#endif
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end program read_stridedf
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