mod_input_output_helper.t

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module mod_input_output_helper
 
  implicit none
 
  ! public methods
  public :: count_ix
  public :: create_output_file
  public :: snapshot_write_header1
  public :: block_shape_io
  public :: get_names_from_string
 
  !> whether a manually inserted snapshot is saved
  logical :: save_now
  !> Version number of the .dat file output
  integer, parameter :: version_number = 5
  contains
 
   function get_names_from_string(aux_variable_names,nwc) result(names) 
    use mod_global_parameters
    character(len=*),intent(in):: aux_variable_names
    integer, intent(in) :: nwc
    character(len=name_len)   :: names(1:nwc)
 
    integer::  space_position,iw
    character(len=name_len)::  wname
    character(len=std_len)::  scanstring
 
    ! copied from subroutine getheadernames in calculate_xw
    !TODO check for errors 
    scanstring=trim(adjustl(aux_variable_names))
    space_position=index(scanstring,' ')
    do iw=1,nwc
       do while (space_position==1)
         scanstring=scanstring(2:)
         space_position=index(scanstring,' ')
       enddo
       wname=scanstring(:space_position-1)
       scanstring=scanstring(space_position+1:)
       space_position=index(scanstring,' ')
 
       names(iw)=trim(adjustl(wname))
    enddo
  end function get_names_from_string  
 
  !> Compute number of elements in index range
  pure integer function count_ix(ixO^L)
    integer, intent(in) :: ixo^l
 
    count_ix = product([ ixomax^d ] - [ ixomin^d ] + 1)
  end function count_ix
 
  !> Determine the shape of a block for output (whether to include ghost cells,
  !> and on which sides)
  subroutine block_shape_io(igrid, n_ghost, ixO^L, n_values)
    use mod_global_parameters
 
    integer, intent(in) :: igrid
    !> nghost(1:ndim) contains the number of ghost cells on the block's minimum
    !> boundaries, and nghost(ndim+1:2*ndim) on the block's maximum boundaries
    integer, intent(out) :: n_ghost(2*ndim)
    !> Index range on output block
    integer, intent(out) :: ixo^l
    !> Number of cells/values in output
    integer, intent(out) :: n_values
 
    integer            :: idim
 
    n_ghost(:) = 0
 
    if(save_physical_boundary) then
      do idim=1,ndim
        ! Include ghost cells on lower boundary
        if(ps(igrid)%is_physical_boundary(2*idim-1)) n_ghost(idim)=nghostcells
        ! Include ghost cells on upper boundary
        if(ps(igrid)%is_physical_boundary(2*idim)) n_ghost(ndim+idim)=nghostcells
      end do
    end if
 
    {ixomin^d = ixmlo^d - n_ghost(^d)\}
    {ixomax^d = ixmhi^d + n_ghost(ndim+^d)\}
 
    n_values = count_ix(ixo^l) * nw
 
  end subroutine block_shape_io
 
  !> Standard method for creating a new output file
  subroutine create_output_file(fh, ix, extension, suffix)
    use mod_global_parameters
    use mod_comm_lib, only: mpistop
    integer, intent(out)         :: fh !< File handle
    integer, intent(in)          :: ix !< Index of file
    character(len=*), intent(in) :: extension !< Extension of file
    character(len=*), intent(in), optional :: suffix !< Optional suffix
 
    integer :: amode
    character(len=std_len)       :: filename
 
    if (ix >= 10000) then
      call mpistop("Number of output files is limited to 10000 (0...9999)")
    end if
 
    if (present(suffix)) then
       write(filename,"(a,a,i4.4,a)") trim(base_filename), &
            trim(suffix), ix, extension
    else
       write(filename,"(a,i4.4,a)") trim(base_filename), ix, extension
    end if
 
    ! MPI cannot easily replace existing files
    open(unit=unitsnapshot,file=filename,status='replace')
    close(unitsnapshot, status='delete')
 
    amode = ior(mpi_mode_create, mpi_mode_wronly)
    call mpi_file_open(mpi_comm_self,filename,amode, &
         mpi_info_null, fh, ierrmpi)
 
    if (ierrmpi /= 0) then
      print *, "Error, cannot create file ", trim(filename)
      call mpistop("Fatal error")
    end if
 
  end subroutine create_output_file
 
  !> Write header for a snapshot, generalize cons_wnames and nw
  !>
  !> If you edit the header, don't forget to update: snapshot_write_header(),
  !> snapshot_read_header(), doc/fileformat.md, tools/python/dat_reader.py
  subroutine snapshot_write_header1(fh, offset_tree, offset_block, dataset_names, nw_vars)
    use mod_forest
    use mod_physics
    use mod_global_parameters
    use mod_slice, only: slicenext
    integer, intent(in)                       :: fh           !< File handle
    integer(kind=MPI_OFFSET_KIND), intent(in) :: offset_tree  !< Offset of tree info
    integer(kind=MPI_OFFSET_KIND), intent(in) :: offset_block !< Offset of block data
    character(len=*), intent(in) :: dataset_names(:)
    integer, intent(in) :: nw_vars
    integer, dimension(MPI_STATUS_SIZE)       :: st
    integer                                   :: iw, er
 
    character(len=name_len) :: dname
 
    call mpi_file_write(fh, version_number, 1, mpi_integer, st, er)
    call mpi_file_write(fh, int(offset_tree), 1, mpi_integer, st, er)
    call mpi_file_write(fh, int(offset_block), 1, mpi_integer, st, er)
    call mpi_file_write(fh, nw_vars, 1, mpi_integer, st, er)
    call mpi_file_write(fh, ndir, 1, mpi_integer, st, er)
    call mpi_file_write(fh, ndim, 1, mpi_integer, st, er)
    call mpi_file_write(fh, levmax, 1, mpi_integer, st, er)
    call mpi_file_write(fh, nleafs, 1, mpi_integer, st, er)
    call mpi_file_write(fh, nparents, 1, mpi_integer, st, er)
    call mpi_file_write(fh, it, 1, mpi_integer, st, er)
    ! Note: It is nice when this double has an even number of 4 byte
    ! integers before it (for alignment)
    call mpi_file_write(fh, global_time, 1, mpi_double_precision, st, er)
 
    call mpi_file_write(fh, [ xprobmin^d ], ndim, &
         mpi_double_precision, st, er)
    call mpi_file_write(fh, [ xprobmax^d ], ndim, &
         mpi_double_precision, st, er)
    call mpi_file_write(fh, [ domain_nx^d ], ndim, &
         mpi_integer, st, er)
    call mpi_file_write(fh, [ block_nx^d ], ndim, &
         mpi_integer, st, er)
 
    ! Periodicity (assume all variables are periodic if one is)
    call mpi_file_write(fh, periodb, ndim, mpi_logical, st, er)
 
    ! Geometry
    call mpi_file_write(fh, geometry_name(1:name_len), &
         name_len, mpi_character, st, er)
 
    ! Write stagger grid mark
    call mpi_file_write(fh, stagger_grid, 1, mpi_logical, st, er)
 
    do iw = 1, nw_vars
      ! using directly trim(adjustl((dataset_names(iw)))) in MPI_FILE_WRITE call 
      ! does not work, there will be trailing characters
      dname = trim(adjustl((dataset_names(iw))))
      call mpi_file_write(fh, dname, name_len, mpi_character, st, er)
    end do
 
    ! Physics related information
    call mpi_file_write(fh, physics_type, name_len, mpi_character, st, er)
 
    ! Format:
    ! integer :: n_par
    ! double precision :: values(n_par)
    ! character(n_par * name_len) :: names
    call phys_write_info(fh)
 
    ! Write snapshotnext etc., which is useful for restarting.
    ! Note we add one, since snapshotnext is updated *after* this procedure
    if(pass_wall_time.or.save_now) then
      call mpi_file_write(fh, snapshotnext, 1, mpi_integer, st, er)
    else
      call mpi_file_write(fh, snapshotnext+1, 1, mpi_integer, st, er)
    end if
    call mpi_file_write(fh, slicenext, 1, mpi_integer, st, er)
    call mpi_file_write(fh, collapsenext, 1, mpi_integer, st, er)
 
  end subroutine snapshot_write_header1
 
end module mod_input_output_helper