ex12.yml

# the alpha parameter
alpha: 0.125
# global data-size (excluding the number of ghost layers for boundary conditions)
global_size: { height: 60, width: 12 }
# degree of parallelism (number of blocks in each dimension)
parallelism: { height: 2, width: 2 }
# PDI configuration
pdi:
  metadata: # small values for which PDI keeps a copy
    ii: int
    dsize: { type: array, subtype: int, size: 2 }
    psize: { type: array, subtype: int, size: 2 }
    pcoord: { type: array, subtype: int, size: 2 }
    should_output: logical
    switch: int
  data: # values for which PDI does not keep a copy
    main_field: { type: array, subtype: double, size: [ '$dsize[0]', '$dsize[1]' ] }
  plugins:
    mpi:
    set_value:
      on_init:
        #*** initialize should_output to false at initialization
        #...
      on_data:
        switch:
          #*** enable the writing of main_field when switch > 50, and disable the writing of main_field when switch < 25
          #...
      on_finalize:
        #*** release the variable should_output
        #...

    decl_hdf5:
      file: ex12.h5
      communicator: $MPI_COMM_WORLD
      datasets: # a list of datasets inside the file created on first access
        main_field: { type: array, subtype: double, size: [ 11, '$psize[0]*($dsize[0]-2)', '$psize[1]*($dsize[1]-2)' ] }
      on_event: loop
      collision_policy: write_into
      write:
        main_field:
          #*** enable the writing of main_field according to the value of should_output
          #...
          dataset_selection:
            size: [1,'$dsize[0]-2', '$dsize[1]-2']
            start: ['$ii', '$pcoord[0]*($dsize[0]-2)', '$pcoord[1]*($dsize[1]-2)']
          memory_selection:
            size: [ '$dsize[0]-2', '$dsize[1]-2' ] # number of elements to transfer in each dimension
            start: [1, 1] # coordinate of the start point in memory relative to the shared data