call MPI_GATHERV(ar1,irecv(id+1),MPI_INTEGER,ar2,irecv,idslp,MPI_INTEGER,0,MPI_COMM_WORLD,ierr)
                  |     |             |       |    |     |         |     |       |         |
                send    |           type      |    |   array       |     |   communicator  |
               buffer   |            of   receive  |     of       type   |               error
	                |           send   buffer  |displacements  of    | 
	                |         elements         |            receive  |
                      number                     number         elements |      
	              (array)                      of                    |
                        of                      elements            destination
	       	     elements                    (array)
                      to send