call MPI_PACK(inbuf,incount,MPI_INTEGER,outbuf,outsize,position,MPI_COMM_WORLD,ierr)
		|       |         |        |       |       |            |         |
              input   number  datatype   output    |    current    communicator   |
	      buffer    of               buffer    |    position                  |
		       input                    output     in                   error
                    components                  buffer   buffer
						 size    (bytes)
                                               (bytes)