| 1 | SUBROUTINE init_coupling |
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| 2 | |
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| 3 | !------------------------------------------------------------------------------! |
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| 4 | ! Actual revisions: |
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| 5 | ! ----------------- |
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| 6 | ! |
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| 7 | ! |
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| 8 | ! Former revisions: |
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| 9 | ! ------------------ |
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| 10 | ! $Id: init_coupling.f90 226 2009-02-02 07:39:34Z raasch $ |
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| 11 | ! |
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| 12 | ! 222 2009-01-12 16:04:16Z letzel |
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| 13 | ! Initial revision |
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| 14 | ! |
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| 15 | ! Description: |
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| 16 | ! ------------ |
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| 17 | ! Initializing coupling via MPI-1 or MPI-2 if the coupled version of PALM is |
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| 18 | ! called. |
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| 19 | !------------------------------------------------------------------------------! |
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| 20 | |
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| 21 | USE pegrid |
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| 22 | USE control_parameters |
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| 23 | |
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| 24 | IMPLICIT NONE |
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| 25 | |
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| 26 | ! |
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| 27 | !-- Local variables |
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| 28 | INTEGER :: i, inter_color |
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| 29 | INTEGER, DIMENSION(:) :: bc_data(0:2) = 0 |
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| 30 | |
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| 31 | ! |
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| 32 | !-- Get information about the coupling mode from the environment variable |
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| 33 | !-- which has been set by the mpiexec command. |
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| 34 | !-- This method is currently not used because the mpiexec command is not |
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| 35 | !-- available on some machines |
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| 36 | ! CALL local_getenv( 'coupling_mode', 13, coupling_mode, i ) |
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| 37 | ! IF ( i == 0 ) coupling_mode = 'uncoupled' |
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| 38 | ! IF ( coupling_mode == 'ocean_to_atmosphere' ) coupling_char = '_O' |
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| 39 | |
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| 40 | ! |
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| 41 | !-- Get information about the coupling mode from standard input (PE0 only) and |
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| 42 | !-- distribute it to the other PEs. If __mpi2 was defined, suggest a |
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| 43 | !-- coupling via MPI-2. Otherwise initate a coupling using MPI-1 only. |
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| 44 | !-- In this case, distribute PEs to 2 new communicators. |
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| 45 | !-- ATTENTION: numprocs will be reset according to the new communicators |
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| 46 | #if defined ( __parallel ) |
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| 47 | IF ( myid == 0 ) THEN |
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| 48 | READ (*,*,ERR=10,END=10) coupling_mode, bc_data(1), bc_data(2) |
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| 49 | 10 CONTINUE |
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| 50 | |
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| 51 | #if defined( __mpi2 ) |
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| 52 | IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN |
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| 53 | i = 1 |
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| 54 | ELSEIF ( TRIM( coupling_mode ) == 'ocean_to_atmosphere' ) THEN |
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| 55 | i = 2 |
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| 56 | ELSE |
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| 57 | i = 0 |
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| 58 | ENDIF |
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| 59 | #else |
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| 60 | IF ( TRIM( coupling_mode ) == 'coupled_run' ) THEN |
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| 61 | i = 1 |
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| 62 | ELSE |
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| 63 | i = 0 |
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| 64 | ENDIF |
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| 65 | #endif |
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| 66 | bc_data(0) = i |
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| 67 | ENDIF |
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| 68 | |
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| 69 | CALL MPI_BCAST( bc_data(0), 3, MPI_INTEGER, 0, MPI_COMM_WORLD, ierr ) |
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| 70 | i = bc_data(0) |
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| 71 | |
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| 72 | #if defined ( __mpi2 ) |
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| 73 | IF ( i == 0 ) THEN |
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| 74 | coupling_mode = 'uncoupled' |
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| 75 | ELSEIF ( i == 1 ) THEN |
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| 76 | coupling_mode = 'atmosphere_to_ocean' |
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| 77 | ELSEIF ( i == 2 ) THEN |
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| 78 | coupling_mode = 'ocean_to_atmosphere' |
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| 79 | ENDIF |
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| 80 | target_id = myid |
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| 81 | #else |
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| 82 | IF ( i == 0 ) THEN |
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| 83 | coupling_mode = 'uncoupled' |
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| 84 | ELSE |
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| 85 | comm_inter = MPI_COMM_WORLD |
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| 86 | |
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| 87 | IF ( myid < bc_data(1) ) THEN |
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| 88 | inter_color = 0 |
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| 89 | numprocs = bc_data(1) |
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| 90 | ELSE |
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| 91 | inter_color = 1 |
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| 92 | numprocs = bc_data(2) |
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| 93 | ENDIF |
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| 94 | ! |
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| 95 | !-- Calculate the target PE for coupling and set up the new communicators. |
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| 96 | !-- Currently only 1:1 topologies are supported. |
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| 97 | target_id = myid - ISIGN( numprocs, inter_color - 1 ) |
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| 98 | IF ( inter_color == 0 ) THEN |
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| 99 | coupling_mode = 'atmosphere_to_ocean' |
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| 100 | ELSE |
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| 101 | coupling_mode = 'ocean_to_atmosphere' |
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| 102 | ENDIF |
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| 103 | CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, inter_color, 0, comm_palm, ierr ) |
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| 104 | comm2d = comm_palm |
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| 105 | |
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| 106 | ! |
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| 107 | !-- Write a flag file for the ocean model and the other atmosphere |
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| 108 | !-- processes. |
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| 109 | OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' ) |
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| 110 | WRITE ( 90, '(''TRUE'')' ) |
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| 111 | CLOSE ( 90 ) |
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| 112 | ENDIF |
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| 113 | #endif |
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| 114 | #endif |
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| 115 | |
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| 116 | IF ( coupling_mode == 'ocean_to_atmosphere' ) coupling_char = '_O' |
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| 117 | |
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| 118 | END SUBROUTINE init_coupling |
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