| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| subroutine exchange_5(g,ibeg,ifin1) |
| |
| c--------------------------------------------------------------------- |
| c--------------------------------------------------------------------- |
| |
| c--------------------------------------------------------------------- |
| c compute the right hand side based on exact solution |
| c--------------------------------------------------------------------- |
| |
| implicit none |
| |
| include 'mpinpb.h' |
| include 'applu.incl' |
| |
| c--------------------------------------------------------------------- |
| c input parameters |
| c--------------------------------------------------------------------- |
| double precision g(0:isiz2+1,0:isiz3+1) |
| integer ibeg, ifin1 |
| |
| c--------------------------------------------------------------------- |
| c local variables |
| c--------------------------------------------------------------------- |
| integer k |
| double precision dum(1024) |
| |
| integer msgid1 |
| integer STATUS(MPI_STATUS_SIZE) |
| integer IERROR |
| |
| |
| |
| c--------------------------------------------------------------------- |
| c communicate in the south and north directions |
| c--------------------------------------------------------------------- |
| |
| c--------------------------------------------------------------------- |
| c receive from south |
| c--------------------------------------------------------------------- |
| if (ifin1.eq.nx) then |
| call MPI_IRECV( dum, |
| > nz, |
| > dp_type, |
| > south, |
| > from_s, |
| > MPI_COMM_WORLD, |
| > msgid1, |
| > IERROR ) |
| |
| call MPI_WAIT( msgid1, STATUS, IERROR ) |
| |
| do k = 1,nz |
| g(nx+1,k) = dum(k) |
| end do |
| |
| end if |
| |
| c--------------------------------------------------------------------- |
| c send north |
| c--------------------------------------------------------------------- |
| if (ibeg.eq.1) then |
| do k = 1,nz |
| dum(k) = g(1,k) |
| end do |
| |
| call MPI_SEND( dum, |
| > nz, |
| > dp_type, |
| > north, |
| > from_s, |
| > MPI_COMM_WORLD, |
| > IERROR ) |
| |
| end if |
| |
| return |
| end |
