!> @file init_coupling.f90 !--------------------------------------------------------------------------------------------------! ! This file is part of the PALM model system. ! ! PALM is free software: you can redistribute it and/or modify it under the terms of the GNU General ! Public License as published by the Free Software Foundation, either version 3 of the License, or ! (at your option) any later version. ! ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the ! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General ! Public License for more details. ! ! You should have received a copy of the GNU General Public License along with PALM. If not, see ! . ! ! Copyright 1997-2021 Leibniz Universitaet Hannover !--------------------------------------------------------------------------------------------------! ! ! Current revisions: ! ----------------- ! ! ! Former revisions: ! ------------------ ! $Id: init_coupling.f90 4828 2021-01-05 11:21:41Z banzhafs $ ! file re-formatted to follow the PALM coding standard ! ! 4564 2020-06-12 14:03:36Z raasch ! Vertical nesting method of Huq et al. (2019) removed ! ! 4444 2020-03-05 15:59:50Z raasch ! bugfix: cpp-directives for serial mode added ! ! 4360 2020-01-07 11:25:50Z suehring ! Corrected "Former revisions" section ! ! 3655 2019-01-07 16:51:22Z knoop ! references to mrun replaced by palmrun, and updated ! ! 222 2009-01-12 16:04:16Z letzel ! Initial revision ! ! Description: ! ------------ !> Initializing coupling via MPI-1 or MPI-2 if the coupled version of PALM is called. !--------------------------------------------------------------------------------------------------! SUBROUTINE init_coupling USE control_parameters, & ONLY: coupling_char, coupling_mode USE kinds USE pegrid IMPLICIT NONE ! !-- Local variables #if defined( __parallel ) INTEGER(iwp) :: i !< INTEGER(iwp) :: inter_color !< #endif INTEGER(iwp), DIMENSION(:) :: bc_data(0:3) = 0 !< ! !-- Get information about the coupling mode from the environment variable which has been set by the !-- mpiexec command. !-- This method is currently not used because the mpiexec command is not available on some machines. ! CALL GET_ENVIRONMENT_VARIABLE( 'coupling_mode', coupling_mode, i ) ! IF ( i == 0 ) coupling_mode = 'uncoupled' ! IF ( coupling_mode == 'ocean_to_atmosphere' ) coupling_char = '_O' ! !-- Get information about the coupling mode from standard input (PE0 only) and distribute it to the !-- other PEs. Distribute PEs to 2 new communicators. !-- ATTENTION: numprocs will be reset according to the new communicators #if defined ( __parallel ) IF ( myid == 0 ) THEN READ (*,*,ERR=10,END=10) coupling_mode, bc_data(1), bc_data(2) 10 CONTINUE IF ( TRIM( coupling_mode ) == 'coupled_run' ) THEN i = 1 ELSE i = 0 ENDIF bc_data(0) = i ! !-- Check if '_O' has to be used as file extension in an uncoupled ocean run. This is required, !-- if this run shall be continued as a coupled run. IF ( TRIM( coupling_mode ) == 'precursor_ocean' ) bc_data(3) = 1 ENDIF CALL MPI_BCAST( bc_data(0), 4, MPI_INTEGER, 0, MPI_COMM_WORLD, ierr ) i = bc_data(0) IF ( i == 0 ) THEN coupling_mode = 'uncoupled' ! !-- In case of a precursor ocean run, an additional flag file is created. !-- This is necessary for data_output_2d_on_each_pe = .T. IF ( bc_data(3) == 1 ) THEN OPEN( 90, FILE='PRECURSOR_OCEAN', FORM='FORMATTED' ) WRITE ( 90, '(''TRUE'')' ) CLOSE ( 90 ) ENDIF ELSE comm_inter = MPI_COMM_WORLD IF ( myid < bc_data(1) ) THEN inter_color = 0 numprocs = bc_data(1) coupling_mode = 'atmosphere_to_ocean' ELSE inter_color = 1 numprocs = bc_data(2) coupling_mode = 'ocean_to_atmosphere' ENDIF CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, inter_color, 0, comm_palm, ierr ) comm2d = comm_palm ! !-- Write a flag file for the ocean model and the other atmosphere processes. OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' ) WRITE ( 90, '(''TRUE'')' ) CLOSE ( 90 ) ENDIF #endif ! !-- In case of a precursor ocean run (followed by a coupled run), or a coupled atmosphere-ocean run, !-- set the file extension for the ocean files. IF ( TRIM( coupling_mode ) == 'ocean_to_atmosphere' .OR. bc_data(3) == 1 ) THEN coupling_char = '_O' ENDIF END SUBROUTINE init_coupling