source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 4178

Last change on this file since 4178 was 3888, checked in by hellstea, 2 years ago

bugfix in pmc_handle_communicator_mod

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1!> @file pmc_handle_communicator_mod.f90
2!------------------------------------------------------------------------------!
3! This file is part of the PALM model system.
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 1997-2019 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: pmc_handle_communicator_mod.f90 3888 2019-04-12 09:18:10Z suehring $
27! Missing MPI_BCAST of anterpolation_buffer_width added.
28!
29! 3885 2019-04-11 11:29:34Z kanani
30! Changes related to global restructuring of location messages and introduction
31! of additional debug messages
32!
33! 3819 2019-03-27 11:01:36Z hellstea
34! Adjustable anterpolation buffer introduced on all nest boundaries, it is controlled
35! by the new nesting_parameters parameter anterpolation_buffer_width.
36!
37! 3655 2019-01-07 16:51:22Z knoop
38! nestpar renamed to nesting_parameters
39!
40! 2841 2018-02-27 15:02:57Z knoop
41! Bugfix: wrong placement of include 'mpif.h' corrected
42!
43! 2801 2018-02-14 16:01:55Z thiele
44! Introduce particle transfer in nested models.
45!
46! 2718 2018-01-02 08:49:38Z maronga
47! Corrected "Former revisions" section
48!
49! 2696 2017-12-14 17:12:51Z kanani
50! Change in file header (GPL part)
51! Bugfix, give Intent(inout) attributes in routine reading nestpar-namelist (MS)
52!
53! 2599 2017-11-01 13:18:45Z hellstea
54! Separate peer communicator peer_comm introduced for MPI_INTERCOMM_CREATE.
55! Some cleanup and commenting improvements.
56!
57! 2516 2017-10-04 11:03:04Z suehring
58! Remove tabs
59!
60! 2514 2017-10-04 09:52:37Z suehring
61! Bugfix, set filepointer to the beginning of the file after namelist read,
62! in order to assure that further namelists are also found.
63!
64! 2279 2017-06-12 15:23:44Z suehring
65! Error message text changed
66!
67! 2101 2017-01-05 16:42:31Z suehring
68!
69! 2013 2016-09-21 13:07:56Z suehring
70! Bugfix in format descriptor
71!
72! 2000 2016-08-20 18:09:15Z knoop
73! Forced header and separation lines into 80 columns
74!
75! 1938 2016-06-13 15:26:05Z hellstea
76! Minor clean-up.
77!
78! 1901 2016-05-04 15:39:38Z raasch
79! Initial version of purely vertical nesting introduced.
80! Code clean up. The words server/client changed to parent/child.
81!
82! 1900 2016-05-04 15:27:53Z raasch
83! re-formatting to match PALM style
84!
85! 1882 2016-04-20 15:24:46Z hellstea
86! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
87! are moved out from the DO i = 1, m_ncpl loop.
88!
89! 1850 2016-04-08 13:29:27Z maronga
90! Module renamed
91!
92! 1808 2016-04-05 19:44:00Z raasch
93! MPI module used by default on all machines
94!
95! 1797 2016-03-21 16:50:28Z raasch
96! introduction of different datatransfer modes,
97! export of comm_world_nesting
98!
99! 1791 2016-03-11 10:41:25Z raasch
100! m_nrofcpl renamed m_ncpl,
101! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
102! renamed and some added,
103! debug write-statements commented out
104!
105! 1786 2016-03-08 05:49:27Z raasch
106! Bugfix: nesting_mode is broadcast now
107!
108! 1779 2016-03-03 08:01:28Z raasch
109! only the total number of PEs is given in the nestpar-NAMELIST,
110! additional comments included
111!
112! 1764 2016-02-28 12:45:19Z raasch
113! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
114! the beginning of the variable list,
115! domain layout is read with new NAMELIST nestpar from standard file PARIN,
116! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
117! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
118! general format changed to PALM style
119!
120! 1762 2016-02-25 12:31:13Z hellstea
121! Initial revision by K. Ketelsen
122!
123! Description:
124! ------------
125! Handle MPI communicator in PALM model coupler
126!-------------------------------------------------------------------------------!
127 MODULE PMC_handle_communicator
128#if defined( __parallel )
129    USE kinds
130
131#if !defined( __mpifh )
132    USE MPI
133#endif
134
135    USE pmc_general,                                                            &
136        ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
137    USE control_parameters,                                                     &
138        ONLY: message_string
139
140    IMPLICIT NONE
141
142#if defined( __mpifh )
143    INCLUDE "mpif.h"
144#endif
145
146    TYPE pmc_layout
147
148       CHARACTER(LEN=32) ::  name
149
150       INTEGER  ::  id            !<
151       INTEGER  ::  parent_id     !<
152       INTEGER  ::  npe_total     !<
153
154       REAL(wp) ::  lower_left_x  !<
155       REAL(wp) ::  lower_left_y  !<
156
157    END TYPE pmc_layout
158
159    PUBLIC  pmc_status_ok, pmc_status_error
160
161    INTEGER, PARAMETER, PUBLIC ::  pmc_error_npes        = 1  !< illegal number of processes
162    INTEGER, PARAMETER, PUBLIC ::  pmc_namelist_error    = 2  !< error(s) in nesting_parameters namelist
163    INTEGER, PARAMETER, PUBLIC ::  pmc_no_namelist_found = 3  !< no couple layout namelist found
164
165    INTEGER ::  m_world_comm  !< global nesting communicator
166    INTEGER ::  m_my_cpl_id   !< coupler id of this model
167    INTEGER ::  m_parent_id   !< coupler id of parent of this model
168    INTEGER ::  m_ncpl        !< number of couplers given in nesting_parameters namelist
169
170    TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) ::  m_couplers  !< information of all couplers
171
172    INTEGER, PUBLIC ::  m_model_comm          !< communicator of this model
173    INTEGER, PUBLIC ::  m_to_parent_comm      !< communicator to the parent
174    INTEGER, PUBLIC ::  m_world_rank          !<
175    INTEGER         ::  m_world_npes          !<
176    INTEGER, PUBLIC ::  m_model_rank          !<
177    INTEGER, PUBLIC ::  m_model_npes          !<
178    INTEGER         ::  m_parent_remote_size  !< number of processes in the parent model
179    INTEGER         ::  peer_comm             !< peer_communicator for inter communicators
180
181    INTEGER, DIMENSION(pmc_max_models), PUBLIC ::  m_to_child_comm    !< communicator to the child(ren)
182    INTEGER, DIMENSION(:), POINTER, PUBLIC ::  pmc_parent_for_child   !<
183
184
185    INTERFACE pmc_is_rootmodel
186       MODULE PROCEDURE pmc_is_rootmodel
187    END INTERFACE pmc_is_rootmodel
188
189    INTERFACE pmc_get_model_info
190       MODULE PROCEDURE pmc_get_model_info
191    END INTERFACE pmc_get_model_info
192
193    PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
194
195 CONTAINS
196
197 SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode,      &
198                            anterpolation_buffer_width, pmc_status )
199
200    USE control_parameters,                                                     &
201        ONLY:  message_string
202
203    USE pegrid,                                                                 &
204        ONLY:  myid
205
206      IMPLICIT NONE
207
208    CHARACTER(LEN=8), INTENT(INOUT) ::  nesting_mode               !<
209    CHARACTER(LEN=7), INTENT(INOUT) ::  nesting_datatransfer_mode  !<
210
211    INTEGER, INTENT(INOUT) ::  anterpolation_buffer_width          !< Boundary buffer width for anterpolation
212    INTEGER, INTENT(INOUT) ::  comm        !<
213    INTEGER, INTENT(INOUT) ::  pmc_status  !<
214
215    INTEGER ::  childcount     !<
216    INTEGER ::  i              !<
217    INTEGER ::  ierr           !<
218    INTEGER ::  istat          !<
219    INTEGER ::  m_my_cpl_rank  !<
220    INTEGER ::  tag            !<
221
222    INTEGER, DIMENSION(pmc_max_models)   ::  activeparent  ! I am active parent for this child ID
223    INTEGER, DIMENSION(pmc_max_models+1) ::  start_pe
224
225    pmc_status   = pmc_status_ok
226    comm         = -1
227    m_world_comm = MPI_COMM_WORLD
228    m_my_cpl_id  = -1
229    childcount   =  0
230    activeparent = -1
231    start_pe(:)  =  0
232
233    CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
234    CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
235!
236!-- Only process 0 of root model reads
237    IF ( m_world_rank == 0 )  THEN
238
239       CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
240                                  anterpolation_buffer_width, pmc_status )
241
242       IF ( pmc_status /= pmc_no_namelist_found  .AND.                          &
243            pmc_status /= pmc_namelist_error )                                  &
244       THEN
245!
246!--       Calculate start PE of every model
247          start_pe(1) = 0
248          DO  i = 2, m_ncpl+1
249             start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
250          ENDDO
251
252!
253!--       The sum of numbers of processes requested by all the domains
254!--       must be equal to the total number of processes of the run
255          IF ( start_pe(m_ncpl+1) /= m_world_npes )  THEN
256             WRITE ( message_string, '(2A,I6,2A,I6,A)' )                        &
257                             'nesting-setup requires different number of ',     &
258                             'MPI procs (', start_pe(m_ncpl+1), ') than ',      &
259                             'provided (', m_world_npes,')'
260             CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
261          ENDIF
262
263       ENDIF
264
265    ENDIF
266!
267!-- Broadcast the read status. This synchronises all other processes with
268!-- process 0 of the root model. Without synchronisation, they would not
269!-- behave in the correct way (e.g. they would not return in case of a
270!-- missing NAMELIST).
271    CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
272
273    IF ( pmc_status == pmc_no_namelist_found )  THEN
274!
275!--    Not a nested run; return the MPI_WORLD communicator
276       comm = MPI_COMM_WORLD
277       RETURN
278
279    ELSEIF ( pmc_status == pmc_namelist_error )  THEN
280!
281!--    Only the root model gives the error message. Others are aborted by the
282!--    message-routine with MPI_ABORT. Must be done this way since myid and
283!--    comm2d have not yet been assigned at this point.
284       IF ( m_world_rank == 0 )  THEN
285          message_string = 'errors in \$nesting_parameters'
286          CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
287       ENDIF
288
289    ENDIF
290
291    CALL MPI_BCAST( m_ncpl,          1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
292    CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
293!
294!-- Broadcast coupling layout
295    DO  i = 1, m_ncpl
296       CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ),           &
297                       MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
298       CALL MPI_BCAST( m_couplers(i)%id,           1, MPI_INTEGER, 0,           &
299                       MPI_COMM_WORLD, istat )
300       CALL MPI_BCAST( m_couplers(i)%Parent_id,    1, MPI_INTEGER, 0,           &
301                       MPI_COMM_WORLD, istat )
302       CALL MPI_BCAST( m_couplers(i)%npe_total,    1, MPI_INTEGER, 0,           &
303                       MPI_COMM_WORLD, istat )
304       CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL,    0,           &
305                       MPI_COMM_WORLD, istat )
306       CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL,    0,           &
307                       MPI_COMM_WORLD, istat )
308    ENDDO
309    CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0,        &
310                    MPI_COMM_WORLD, istat )
311    CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode),  &
312                    MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
313    CALL MPI_BCAST( anterpolation_buffer_width, 1, MPI_INT, 0, MPI_COMM_WORLD,  &
314                    istat )
315!
316!-- Assign global MPI processes to individual models by setting the couple id
317    DO  i = 1, m_ncpl
318       IF ( m_world_rank >= start_pe(i)  .AND.  m_world_rank < start_pe(i+1) )  &
319       THEN
320          m_my_cpl_id = i
321          EXIT
322       ENDIF
323    ENDDO
324    m_my_cpl_rank = m_world_rank - start_pe(i)
325!
326!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
327!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
328!-- The color of the model is represented by the coupler id
329    CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm,      &
330                         istat )
331!
332!-- Get size and rank of the model running on this process
333    CALL  MPI_COMM_RANK( comm, m_model_rank, istat )
334    CALL  MPI_COMM_SIZE( comm, m_model_npes, istat )
335!
336!-- Broadcast (from process 0) the parent id and id of every model
337    DO  i = 1, m_ncpl
338       CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0,              &
339                       MPI_COMM_WORLD, istat )
340       CALL MPI_BCAST( m_couplers(i)%id,        1, MPI_INTEGER, 0,              &
341                       MPI_COMM_WORLD, istat )
342    ENDDO
343!
344!-- Save the current model communicator for pmc internal use
345    m_model_comm = comm
346
347!
348!-- Create intercommunicator between the parent and children.
349!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
350!-- different colors.
351!-- The grouping was done above with MPI_COMM_SPLIT.
352!-- A duplicate of MPI_COMM_WORLD is created and used as peer communicator
353!-- (peer_comm) for MPI_INTERCOMM_CREATE.
354    CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr ) 
355    DO  i = 2, m_ncpl
356       IF ( m_couplers(i)%parent_id == m_my_cpl_id )  THEN
357!
358!--       Identify all children models of the current model and create
359!--       inter-communicators to connect between the current model and its
360!--       children models.
361          tag = 500 + i
362          CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i),           &
363                                     tag, m_to_child_comm(i), istat)
364          childcount = childcount + 1
365          activeparent(i) = 1
366       ELSEIF ( i == m_my_cpl_id)  THEN
367!
368!--       Create an inter-communicator to connect between the current
369!--       model and its parent model.   
370          tag = 500 + i
371          CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm,                        &
372                                     start_pe(m_couplers(i)%parent_id),         &
373                                     tag, m_to_parent_comm, istat )
374       ENDIF
375    ENDDO
376!
377!-- If I am a parent, count the number of children I have.
378!-- Although this loop is symmetric on all processes, the "activeparent" flag
379!-- is true (==1) on the respective individual process only.
380    ALLOCATE( pmc_parent_for_child(childcount+1) )
381
382    childcount = 0
383    DO  i = 2, m_ncpl
384       IF ( activeparent(i) == 1 )  THEN
385          childcount = childcount + 1
386          pmc_parent_for_child(childcount) = i
387       ENDIF
388    ENDDO
389!
390!-- Get the size of the parent model
391    IF ( m_my_cpl_id > 1 )  THEN
392       CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size,       &
393                                  istat )
394    ELSE
395!
396!--    The root model does not have a parent
397       m_parent_remote_size = -1
398    ENDIF
399!
400!-- Set myid to non-zero value except for the root domain. This is a setting
401!-- for the message routine which is called at the end of pmci_init. That
402!-- routine outputs messages for myid = 0, only. However, myid has not been
403!-- assigened so far, so that all processes of the root model would output a
404!-- message. To avoid this, set myid to some other value except for process 0
405!-- of the root domain.
406    IF ( m_world_rank /= 0 )  myid = 1
407
408 END SUBROUTINE PMC_init_model
409
410
411
412 SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name,           &
413                                cpl_parent_id, lower_left_x, lower_left_y,      &
414                                ncpl, npe_total, request_for_cpl_id )
415!
416!-- Provide module private variables of the pmc for PALM
417
418    USE kinds
419
420    IMPLICIT NONE
421
422    CHARACTER(LEN=*), INTENT(OUT), OPTIONAL ::  cpl_name   !<
423
424    INTEGER, INTENT(IN), OPTIONAL ::  request_for_cpl_id   !<
425
426    INTEGER, INTENT(OUT), OPTIONAL ::  comm_world_nesting  !<
427    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_id              !<
428    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_parent_id       !<
429    INTEGER, INTENT(OUT), OPTIONAL ::  ncpl                !<
430    INTEGER, INTENT(OUT), OPTIONAL ::  npe_total           !<
431
432    INTEGER ::  requested_cpl_id                           !<
433
434    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_x       !<
435    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_y       !<
436
437!
438!-- Set the requested coupler id
439    IF ( PRESENT( request_for_cpl_id ) )  THEN
440       requested_cpl_id = request_for_cpl_id
441!
442!--    Check for allowed range of values
443       IF ( requested_cpl_id < 1  .OR.  requested_cpl_id > m_ncpl )  RETURN
444    ELSE
445       requested_cpl_id = m_my_cpl_id
446    ENDIF
447!
448!-- Return the requested information
449    IF ( PRESENT( comm_world_nesting )  )  THEN
450       comm_world_nesting = m_world_comm
451    ENDIF
452    IF ( PRESENT( cpl_id )        )  THEN
453       cpl_id = requested_cpl_id
454    ENDIF
455    IF ( PRESENT( cpl_parent_id ) )  THEN
456       cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
457    ENDIF
458    IF ( PRESENT( cpl_name )      )  THEN
459       cpl_name = m_couplers(requested_cpl_id)%name
460    ENDIF
461    IF ( PRESENT( ncpl )          )  THEN
462       ncpl = m_ncpl
463    ENDIF
464    IF ( PRESENT( npe_total )     )  THEN
465       npe_total = m_couplers(requested_cpl_id)%npe_total
466    ENDIF
467    IF ( PRESENT( lower_left_x )  )  THEN
468       lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
469    ENDIF
470    IF ( PRESENT( lower_left_y )  )  THEN
471       lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
472    ENDIF
473
474 END SUBROUTINE pmc_get_model_info
475
476
477
478 LOGICAL function pmc_is_rootmodel( )
479
480    IMPLICIT NONE
481
482    pmc_is_rootmodel = ( m_my_cpl_id == 1 )
483
484 END FUNCTION pmc_is_rootmodel
485
486
487
488 SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
489      anterpolation_buffer_width, pmc_status )
490
491    IMPLICIT NONE
492
493    CHARACTER(LEN=8), INTENT(INOUT) ::  nesting_mode
494    CHARACTER(LEN=7), INTENT(INOUT) ::  nesting_datatransfer_mode
495   
496    INTEGER, INTENT(INOUT)      ::  anterpolation_buffer_width     !< Boundary buffer width for anterpolation
497    INTEGER(iwp), INTENT(INOUT) ::  pmc_status
498    INTEGER(iwp)                ::  bad_llcorner
499    INTEGER(iwp)                ::  i
500    INTEGER(iwp)                ::  istat
501
502    TYPE(pmc_layout), DIMENSION(pmc_max_models) ::  domain_layouts
503
504    NAMELIST /nesting_parameters/  domain_layouts, nesting_datatransfer_mode,  &
505                                   nesting_mode, anterpolation_buffer_width
506   
507!
508!-- Initialize some coupling variables
509    domain_layouts(1:pmc_max_models)%id = -1
510    m_ncpl =   0
511
512    pmc_status = pmc_status_ok
513!
514!-- Open the NAMELIST-file and read the nesting layout
515    CALL check_open( 11 )
516    READ ( 11, nesting_parameters, IOSTAT=istat )
517!
518!-- Set filepointer to the beginning of the file. Otherwise process 0 will later
519!-- be unable to read the inipar-NAMELIST
520    REWIND ( 11 )
521
522    IF ( istat < 0 )  THEN
523!
524!--    No nesting_parameters-NAMELIST found
525       pmc_status = pmc_no_namelist_found
526       RETURN
527    ELSEIF ( istat > 0 )  THEN
528!
529!--    Errors in reading nesting_parameters-NAMELIST
530       pmc_status = pmc_namelist_error
531       RETURN
532    ENDIF
533!
534!-- Output location message
535    CALL location_message( 'initialize communicators for nesting', 'start' )
536!
537!-- Assign the layout to the corresponding internally used variable m_couplers
538    m_couplers = domain_layouts
539!
540!-- Get the number of nested models given in the nesting_parameters-NAMELIST
541    DO  i = 1, pmc_max_models
542!
543!--    When id=-1 is found for the first time, the list of domains is finished
544       IF ( m_couplers(i)%id == -1  .OR.  i == pmc_max_models )  THEN
545          IF ( m_couplers(i)%id == -1 )  THEN
546             m_ncpl = i - 1
547             EXIT
548          ELSE
549             m_ncpl = pmc_max_models
550          ENDIF
551       ENDIF
552    ENDDO
553!
554!-- Make sure that all domains have equal lower left corner in case of vertical
555!-- nesting
556    IF ( nesting_mode == 'vertical' )  THEN
557       bad_llcorner = 0
558       DO  i = 1, m_ncpl
559          IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR.                    &
560               domain_layouts(i)%lower_left_y /= 0.0_wp )  THEN
561             bad_llcorner = bad_llcorner + 1
562             domain_layouts(i)%lower_left_x = 0.0_wp
563             domain_layouts(i)%lower_left_y = 0.0_wp
564          ENDIF
565       ENDDO
566       IF ( bad_llcorner /= 0)  THEN
567          WRITE ( message_string, *)  'at least one dimension of lower ',       &
568                                      'left corner of one domain is not 0. ',   &
569                                      'All lower left corners were set to (0, 0)'
570          CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
571       ENDIF
572    ENDIF
573
574    CALL location_message( 'initialize communicators for nesting', 'finished' )
575
576 END SUBROUTINE read_coupling_layout
577
578#endif
579 END MODULE pmc_handle_communicator
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