source: palm/trunk/SOURCE/init_coupling.f90 @ 2298

Last change on this file since 2298 was 2298, checked in by raasch, 4 years ago

write_binary is of type LOGICAL now, MPI2-related code removed, obsolete variables removed, sendrecv_in_background related parts removed, missing variable descriptions added

  • Property svn:keywords set to Id
File size: 4.9 KB
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1!> @file init_coupling.f90
2!------------------------------------------------------------------------------!
3! This file is part of PALM.
4!
5! PALM is free software: you can redistribute it and/or modify it under the
6! terms of the GNU General Public License as published by the Free Software
7! Foundation, either version 3 of the License, or (at your option) any later
8! version.
9!
10! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
13!
14! You should have received a copy of the GNU General Public License along with
15! PALM. If not, see <http://www.gnu.org/licenses/>.
16!
17! Copyright 1997-2017 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! -----------------
22!
23!
24! Former revisions:
25! ------------------
26! $Id: init_coupling.f90 2298 2017-06-29 09:28:18Z raasch $
27! MPI2 coupling removed
28!
29! 2101 2017-01-05 16:42:31Z suehring
30!
31! 2000 2016-08-20 18:09:15Z knoop
32! Forced header and separation lines into 80 columns
33!
34! 1808 2016-04-05 19:44:00Z raasch
35! routine local_getenv replaced by standard FORTRAN routine
36!
37! 1682 2015-10-07 23:56:08Z knoop
38! Code annotations made doxygen readable
39!
40! 1320 2014-03-20 08:40:49Z raasch
41! ONLY-attribute added to USE-statements,
42! kind-parameters added to all INTEGER and REAL declaration statements,
43! kinds are defined in new module kinds,
44! revision history before 2012 removed,
45! comment fields (!:) to be used for variable explanations added to
46! all variable declaration statements
47!
48! 1036 2012-10-22 13:43:42Z raasch
49! code put under GPL (PALM 3.9)
50!
51! 222 2009-01-12 16:04:16Z letzel
52! Initial revision
53!
54! Description:
55! ------------
56!> Initializing coupling via MPI-1 or MPI-2 if the coupled version of PALM is
57!> called.
58!------------------------------------------------------------------------------!
59  SUBROUTINE init_coupling
60 
61
62    USE control_parameters,                                                    &
63        ONLY:  coupling_char, coupling_mode
64       
65    USE kinds
66   
67    USE pegrid
68
69    IMPLICIT NONE
70
71!
72!-- Local variables
73    INTEGER(iwp) ::  i            !<
74    INTEGER(iwp) ::  inter_color  !<
75   
76    INTEGER(iwp), DIMENSION(:) ::  bc_data(0:3) = 0  !<
77
78!
79!-- Get information about the coupling mode from the environment variable
80!-- which has been set by the mpiexec command.
81!-- This method is currently not used because the mpiexec command is not
82!-- available on some machines
83!    CALL GET_ENVIRONMENT_VARIABLE( 'coupling_mode', coupling_mode, i )
84!    IF ( i == 0 )  coupling_mode = 'uncoupled'
85!    IF ( coupling_mode == 'ocean_to_atmosphere' )  coupling_char = '_O'
86
87!
88!-- Get information about the coupling mode from standard input (PE0 only) and
89!-- distribute it to the other PEs. Distribute PEs to 2 new communicators.
90!-- ATTENTION: numprocs will be reset according to the new communicators
91#if defined ( __parallel )
92
93    IF ( myid == 0 )  THEN
94       READ (*,*,ERR=10,END=10)  coupling_mode, bc_data(1), bc_data(2)
9510     CONTINUE
96       IF ( TRIM( coupling_mode ) == 'coupled_run' )  THEN
97          i = 1
98       ELSE
99          i = 0
100       ENDIF
101       bc_data(0) = i
102
103!
104!--    Check if '_O' has to be used as file extension in an uncoupled ocean
105!--    run. This is required, if this run shall be continued as a coupled run.
106       IF ( TRIM( coupling_mode ) == 'precursor_ocean' )  bc_data(3) = 1
107
108    ENDIF
109
110    CALL MPI_BCAST( bc_data(0), 4, MPI_INTEGER, 0, MPI_COMM_WORLD, ierr )
111    i = bc_data(0)
112
113    IF ( i == 0 ) THEN
114       coupling_mode = 'uncoupled'
115!
116!--    In case of a precursor ocean run, an additional flag file is created.
117!--    This is necessary for data_output_2d_on_each_pe = .T.
118       IF ( bc_data(3) == 1 )  THEN
119          OPEN( 90, FILE='PRECURSOR_OCEAN', FORM='FORMATTED' )
120          WRITE ( 90, '(''TRUE'')' )
121          CLOSE ( 90 )
122       ENDIF
123    ELSE
124       comm_inter = MPI_COMM_WORLD
125
126       IF ( myid < bc_data(1) ) THEN
127          inter_color     = 0
128          numprocs        = bc_data(1)
129          coupling_mode   = 'atmosphere_to_ocean'
130       ELSE
131          inter_color     = 1
132          numprocs        = bc_data(2)
133          coupling_mode   = 'ocean_to_atmosphere'
134       ENDIF
135
136       CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, inter_color, 0, comm_palm, ierr )
137       comm2d = comm_palm
138
139!
140!--    Write a flag file for the ocean model and the other atmosphere
141!--    processes.
142       OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
143       WRITE ( 90, '(''TRUE'')' )
144       CLOSE ( 90 )
145    ENDIF
146#endif
147
148!
149!-- In case of a precursor ocean run (followed by a coupled run), or a
150!-- coupled atmosphere-ocean run, set the file extension for the ocean files
151    IF ( TRIM( coupling_mode ) == 'ocean_to_atmosphere' .OR. bc_data(3) == 1 ) &
152    THEN
153       coupling_char = '_O'
154    ENDIF
155
156 END SUBROUTINE init_coupling
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