source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 2013

Last change on this file since 2013 was 2013, checked in by suehring, 8 years ago

Bugfix in format descriptor

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[1938]1  MODULE PMC_handle_communicator
[1762]2
[2000]3!------------------------------------------------------------------------------!
[1762]4! This file is part of PALM.
5!
[2000]6! PALM is free software: you can redistribute it and/or modify it under the
7! terms of the GNU General Public License as published by the Free Software
8! Foundation, either version 3 of the License, or (at your option) any later
9! version.
[1762]10!
11! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
12! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
14!
15! You should have received a copy of the GNU General Public License along with
16! PALM. If not, see <http://www.gnu.org/licenses/>.
17!
[1818]18! Copyright 1997-2016 Leibniz Universitaet Hannover
[2000]19!------------------------------------------------------------------------------!
[1762]20!
21! Current revisions:
22! ------------------
[2013]23! Bugfix in format descriptor
[1851]24!
[1792]25! Former revisions:
26! -----------------
27! $Id: pmc_handle_communicator_mod.f90 2013 2016-09-21 13:07:56Z suehring $
28!
[2001]29! 2000 2016-08-20 18:09:15Z knoop
30! Forced header and separation lines into 80 columns
31!
[1939]32! 1938 2016-06-13 15:26:05Z hellstea
33! Minor clean-up.
34!
[1933]35! 1901 2016-05-04 15:39:38Z raasch
36! Initial version of purely vertical nesting introduced.
37! Code clean up. The words server/client changed to parent/child.
38!
[1901]39! 1900 2016-05-04 15:27:53Z raasch
40! re-formatting to match PALM style
41!
[1883]42! 1882 2016-04-20 15:24:46Z hellstea
43! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
44! are moved out from the DO i = 1, m_ncpl loop.
45!
[1851]46! 1850 2016-04-08 13:29:27Z maronga
47! Module renamed
48!
[1809]49! 1808 2016-04-05 19:44:00Z raasch
50! MPI module used by default on all machines
51!
[1798]52! 1797 2016-03-21 16:50:28Z raasch
53! introduction of different datatransfer modes,
54! export of comm_world_nesting
55!
[1792]56! 1791 2016-03-11 10:41:25Z raasch
[1791]57! m_nrofcpl renamed m_ncpl,
58! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
59! renamed and some added,
60! debug write-statements commented out
[1765]61!
[1787]62! 1786 2016-03-08 05:49:27Z raasch
63! Bugfix: nesting_mode is broadcast now
64!
[1780]65! 1779 2016-03-03 08:01:28Z raasch
66! only the total number of PEs is given in the nestpar-NAMELIST,
67! additional comments included
68!
[1765]69! 1764 2016-02-28 12:45:19Z raasch
[1764]70! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
71! the beginning of the variable list,
72! domain layout is read with new NAMELIST nestpar from standard file PARIN,
73! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
74! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
75! general format changed to PALM style
[1762]76!
[1763]77! 1762 2016-02-25 12:31:13Z hellstea
78! Initial revision by K. Ketelsen
79!
[1762]80! Description:
81! ------------
[1764]82! Handle MPI communicator in PALM model coupler
[1933]83!-------------------------------------------------------------------------------!
[1762]84
[1764]85#if defined( __parallel )
86    USE kinds
[1762]87
[1808]88#if defined( __mpifh )
89    INCLUDE "mpif.h"
90#else
[1764]91    USE MPI
92#endif
[1762]93
[1933]94    USE pmc_general,                                                            &
[1900]95        ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
[1933]96    USE control_parameters,                                                     &
97        ONLY: message_string
[1762]98
[1900]99    IMPLICIT NONE
[1762]100
[1900]101    TYPE pmc_layout
[1762]102
[1900]103       CHARACTER(LEN=32) ::  name
[1762]104
[1900]105       INTEGER  ::  id            !<
106       INTEGER  ::  parent_id     !<
107       INTEGER  ::  npe_total     !<
[1762]108
[1900]109       REAL(wp) ::  lower_left_x  !<
110       REAL(wp) ::  lower_left_y  !<
[1762]111
[1900]112    END TYPE pmc_layout
[1764]113
[1900]114    PUBLIC  pmc_status_ok, pmc_status_error
[1764]115
[1900]116    INTEGER, PARAMETER, PUBLIC ::  pmc_error_npes        = 1  !< illegal number of PEs
117    INTEGER, PARAMETER, PUBLIC ::  pmc_namelist_error    = 2  !< error(s) in nestpar namelist
118    INTEGER, PARAMETER, PUBLIC ::  pmc_no_namelist_found = 3  !< no couple layout namelist found
[1764]119
[1900]120    INTEGER ::  m_world_comm  !< global nesting communicator
121    INTEGER ::  m_my_cpl_id   !< coupler id of this model
122    INTEGER ::  m_parent_id   !< coupler id of parent of this model
123    INTEGER ::  m_ncpl        !< number of couplers given in nestpar namelist
[1762]124
[1900]125    TYPE(pmc_layout), DIMENSION(pmc_max_models) ::  m_couplers  !< information of all couplers
[1762]126
[1900]127    INTEGER, PUBLIC ::  m_model_comm          !< communicator of this model
[1933]128    INTEGER, PUBLIC ::  m_to_parent_comm      !< communicator to the parent
[1900]129    INTEGER, PUBLIC ::  m_world_rank          !<
130    INTEGER         ::  m_world_npes          !<
131    INTEGER, PUBLIC ::  m_model_rank          !<
132    INTEGER, PUBLIC ::  m_model_npes          !<
[1933]133    INTEGER         ::  m_parent_remote_size  !< number of parent PEs
[1791]134
[1933]135    INTEGER, DIMENSION(pmc_max_models), PUBLIC ::  m_to_child_comm    !< communicator to the child(ren)
136    INTEGER, DIMENSION(:), POINTER, PUBLIC ::  pmc_parent_for_child   !<
[1762]137
138
[1900]139    INTERFACE pmc_is_rootmodel
140       MODULE PROCEDURE pmc_is_rootmodel
141    END INTERFACE pmc_is_rootmodel
[1762]142
[1900]143    INTERFACE pmc_get_model_info
144       MODULE PROCEDURE pmc_get_model_info
145    END INTERFACE pmc_get_model_info
[1762]146
[1900]147    PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
[1762]148
[1764]149 CONTAINS
[1762]150
[1933]151 SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode,      &
[1797]152                              pmc_status )
[1762]153
[1933]154    USE control_parameters,                                                     &
[1900]155        ONLY:  message_string
[1764]156
[1933]157    USE pegrid,                                                                 &
[1900]158        ONLY:  myid
[1764]159
160      IMPLICIT NONE
161
[1933]162    CHARACTER(LEN=8), INTENT(OUT) ::  nesting_mode               !<
[1900]163    CHARACTER(LEN=7), INTENT(OUT) ::  nesting_datatransfer_mode  !<
[1764]164
[1900]165    INTEGER, INTENT(OUT) ::  comm        !<
166    INTEGER, INTENT(OUT) ::  pmc_status  !<
[1764]167
[1933]168    INTEGER ::  childcount     !<
[1900]169    INTEGER ::  i              !<
170    INTEGER ::  ierr           !<
171    INTEGER ::  istat          !<
172    INTEGER ::  m_my_cpl_rank  !<
173    INTEGER ::  tag            !<
[1764]174
[1933]175    INTEGER, DIMENSION(pmc_max_models)   ::  activeparent  ! I am active parent for this child ID
[1900]176    INTEGER, DIMENSION(pmc_max_models+1) ::  start_pe
[1762]177
[1900]178    pmc_status   = pmc_status_ok
179    comm         = -1
180    m_world_comm = MPI_COMM_WORLD
181    m_my_cpl_id  = -1
[1933]182    childcount   =  0
183    activeparent = -1
[1900]184    start_pe(:)  =  0
185
186    CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
187    CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
[1764]188!
[1900]189!-- Only PE 0 of root model reads
190    IF ( m_world_rank == 0 )  THEN
[1762]191
[1933]192       CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
[1900]193                                  pmc_status )
[1762]194
[1933]195       IF ( pmc_status /= pmc_no_namelist_found  .AND.                          &
196            pmc_status /= pmc_namelist_error )                                  &
[1900]197       THEN
[1764]198!
[1900]199!--       Calculate start PE of every model
200          start_pe(1) = 0
201          DO  i = 2, m_ncpl+1
202             start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
203          ENDDO
[1762]204
[1764]205!
[1900]206!--       The number of cores provided with the run must be the same as the
207!--       total sum of cores required by all nest domains
208          IF ( start_pe(m_ncpl+1) /= m_world_npes )  THEN
[2013]209             WRITE ( message_string, '(2A,I6,2A,I6,A)' )                        &
[1933]210                             'nesting-setup requires different number of ',     &
211                             'MPI procs (', start_pe(m_ncpl+1), ') than ',      &
212                             'provided (', m_world_npes,')'
[1900]213             CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
214          ENDIF
[1762]215
[1900]216       ENDIF
[1762]217
[1900]218    ENDIF
[1764]219!
[1900]220!-- Broadcast the read status. This synchronises all other PEs with PE 0 of
221!-- the root model. Without synchronisation, they would not behave in the
222!-- correct way (e.g. they would not return in case of a missing NAMELIST)
223    CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
[1762]224
[1900]225    IF ( pmc_status == pmc_no_namelist_found )  THEN
[1764]226!
[1900]227!--    Not a nested run; return the MPI_WORLD communicator
228       comm = MPI_COMM_WORLD
229       RETURN
[1762]230
[1900]231    ELSEIF ( pmc_status == pmc_namelist_error )  THEN
[1764]232!
[1900]233!--    Only the root model gives the error message. Others are aborted by the
234!--    message-routine with MPI_ABORT. Must be done this way since myid and
235!--    comm2d have not yet been assigned at this point.
236       IF ( m_world_rank == 0 )  THEN
237          message_string = 'errors in \$nestpar'
238          CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
239       ENDIF
[1762]240
[1900]241    ENDIF
[1762]242
[1900]243    CALL MPI_BCAST( m_ncpl,          1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
244    CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
[1762]245
[1764]246!
[1900]247!-- Broadcast coupling layout
248    DO  i = 1, m_ncpl
[1933]249       CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ),           &
[1900]250                       MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
[1933]251       CALL MPI_BCAST( m_couplers(i)%id,           1, MPI_INTEGER, 0,           &
[1900]252                       MPI_COMM_WORLD, istat )
[1933]253       CALL MPI_BCAST( m_couplers(i)%Parent_id,    1, MPI_INTEGER, 0,           &
[1900]254                       MPI_COMM_WORLD, istat )
[1933]255       CALL MPI_BCAST( m_couplers(i)%npe_total,    1, MPI_INTEGER, 0,           &
[1900]256                       MPI_COMM_WORLD, istat )
[1933]257       CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL,    0,           &
[1900]258                       MPI_COMM_WORLD, istat )
[1933]259       CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL,    0,           &
[1900]260                       MPI_COMM_WORLD, istat )
261    ENDDO
[1933]262    CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0,        &
[1900]263                    MPI_COMM_WORLD, istat )
[1933]264    CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode),  &
[1900]265                    MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
[1762]266
[1764]267!
[1900]268!-- Assign global MPI processes to individual models by setting the couple id
269    DO  i = 1, m_ncpl
[1933]270       IF ( m_world_rank >= start_pe(i)  .AND.  m_world_rank < start_pe(i+1) )  &
[1900]271       THEN
272          m_my_cpl_id = i
273          EXIT
274       ENDIF
275    ENDDO
276    m_my_cpl_rank = m_world_rank - start_pe(i)
[1762]277
[1764]278!
[1900]279!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
280!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
281!-- The color of the model is represented by the coupler id
[1933]282    CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm,      &
[1900]283                         istat )
[1764]284!
[1900]285!-- Get size and rank of the model running on this PE
286    CALL  MPI_COMM_RANK( comm, m_model_rank, istat )
287    CALL  MPI_COMM_SIZE( comm, m_model_npes, istat )
[1762]288
[1764]289!
[1900]290!-- Broadcast (from PE 0) the parent id and id of every model
291    DO  i = 1, m_ncpl
[1933]292       CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0,              &
[1900]293                       MPI_COMM_WORLD, istat )
[1933]294       CALL MPI_BCAST( m_couplers(i)%id,        1, MPI_INTEGER, 0,              &
[1900]295                       MPI_COMM_WORLD, istat )
296    ENDDO
[1762]297
[1764]298!
[1900]299!-- Save the current model communicator for pmc internal use
300    m_model_comm = comm
[1762]301
[1764]302!
[1933]303!-- Create intercommunicator between parent and children.
[1900]304!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
305!-- different colors.
306!-- The grouping was done above with MPI_COMM_SPLIT
307    DO  i = 2, m_ncpl
[1762]308
[1900]309       IF ( m_couplers(i)%parent_id == m_my_cpl_id )  THEN
[1764]310!
[1933]311!--       Collect parent PEs.
[1900]312!--       Every model exept the root model has a parent model which acts as
[1933]313!--       parent model. Create an intercommunicator to connect current PE to
314!--       all children PEs
[1900]315          tag = 500 + i
[1933]316          CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD, start_pe(i),      &
317                                     tag, m_to_child_comm(i), istat)
318          childcount = childcount + 1
319          activeparent(i) = 1
[1762]320
[1900]321       ELSEIF ( i == m_my_cpl_id)  THEN
[1764]322!
[1933]323!--       Collect children PEs.
324!--       Every model except the root model has a parent model.
325!--       Create an intercommunicator to connect current PE to all parent PEs
[1900]326          tag = 500 + i
[1933]327          CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD,                   &
328                                     start_pe(m_couplers(i)%parent_id),         &
329                                     tag, m_to_parent_comm, istat )
[1900]330       ENDIF
[1762]331
[1900]332    ENDDO
[1762]333
[1764]334!
[1933]335!-- If I am parent, count the number of children that I have
336!-- Although this loop is symmetric on all processes, the "activeparent" flag
[1900]337!-- is true (==1) on the respective individual PE only.
[1933]338    ALLOCATE( pmc_parent_for_child(childcount+1) )
[1762]339
[1933]340    childcount = 0
[1900]341    DO  i = 2, m_ncpl
[1933]342       IF ( activeparent(i) == 1 )  THEN
343          childcount = childcount + 1
344          pmc_parent_for_child(childcount) = i
[1900]345       ENDIF
346    ENDDO
[1764]347!
[1933]348!-- Get the size of the parent model
[1900]349    IF ( m_my_cpl_id > 1 )  THEN
[1933]350       CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size,       &
[1900]351                                  istat)
352    ELSE
[1764]353!
[1933]354!--    The root model does not have a parent
355       m_parent_remote_size = -1
[1900]356    ENDIF
[1764]357!
[1900]358!-- Set myid to non-tero value except for the root domain. This is a setting
359!-- for the message routine which is called at the end of pmci_init. That
360!-- routine outputs messages for myid = 0, only. However, myid has not been
361!-- assigened so far, so that all PEs of the root model would output a
362!-- message. To avoid this, set myid to some other value except for PE0 of the
363!-- root domain.
364    IF ( m_world_rank /= 0 )  myid = 1
[1762]365
[1900]366 END SUBROUTINE PMC_init_model
[1762]367
368
[1900]369
[1933]370 SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name,           &
371                                cpl_parent_id, lower_left_x, lower_left_y,      &
[1900]372                                ncpl, npe_total, request_for_cpl_id )
[1764]373!
[1791]374!-- Provide module private variables of the pmc for PALM
[1762]375
[1900]376    USE kinds
[1762]377
[1900]378    IMPLICIT NONE
[1762]379
[1933]380    CHARACTER(LEN=*), INTENT(OUT), OPTIONAL ::  cpl_name   !<
[1762]381
[1933]382    INTEGER, INTENT(IN), OPTIONAL ::  request_for_cpl_id   !<
[1762]383
[1900]384    INTEGER, INTENT(OUT), OPTIONAL ::  comm_world_nesting  !<
385    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_id              !<
386    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_parent_id       !<
387    INTEGER, INTENT(OUT), OPTIONAL ::  ncpl                !<
388    INTEGER, INTENT(OUT), OPTIONAL ::  npe_total           !<
[1762]389
[1900]390    INTEGER ::  requested_cpl_id  !<
[1764]391
[1900]392    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_x  !<
393    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_y  !<
[1764]394
[1791]395!
[1900]396!-- Set the requested coupler id
397    IF ( PRESENT( request_for_cpl_id ) )  THEN
398       requested_cpl_id = request_for_cpl_id
[1791]399!
[1900]400!--    Check for allowed range of values
401       IF ( requested_cpl_id < 1  .OR.  requested_cpl_id > m_ncpl )  RETURN
402    ELSE
403       requested_cpl_id = m_my_cpl_id
404    ENDIF
[1791]405
406!
[1900]407!-- Return the requested information
408    IF ( PRESENT( comm_world_nesting )  )  THEN
409       comm_world_nesting = m_world_comm
410    ENDIF
411    IF ( PRESENT( cpl_id )        )  THEN
412       cpl_id = requested_cpl_id
413    ENDIF
414    IF ( PRESENT( cpl_parent_id ) )  THEN
415       cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
416    ENDIF
417    IF ( PRESENT( cpl_name )      )  THEN
418       cpl_name = m_couplers(requested_cpl_id)%name
419    ENDIF
420    IF ( PRESENT( ncpl )          )  THEN
421       ncpl = m_ncpl
422    ENDIF
423    IF ( PRESENT( npe_total )     )  THEN
424       npe_total = m_couplers(requested_cpl_id)%npe_total
425    ENDIF
426    IF ( PRESENT( lower_left_x )  )  THEN
427       lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
428    ENDIF
429    IF ( PRESENT( lower_left_y )  )  THEN
430       lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
431    ENDIF
[1791]432
[1900]433 END SUBROUTINE pmc_get_model_info
[1791]434
435
436
[1900]437 LOGICAL function pmc_is_rootmodel( )
[1764]438
[1900]439    IMPLICIT NONE
[1764]440
[1900]441    pmc_is_rootmodel = ( m_my_cpl_id == 1 )
[1764]442
[1900]443 END FUNCTION pmc_is_rootmodel
[1764]444
445
446
[1933]447 SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
[1797]448                                  pmc_status )
[1762]449
[1764]450    IMPLICIT NONE
[1762]451
[1933]452    CHARACTER(LEN=8), INTENT(INOUT) ::  nesting_mode
[1797]453    CHARACTER(LEN=7), INTENT(INOUT) ::  nesting_datatransfer_mode
[1764]454
[1933]455    INTEGER(iwp), INTENT(INOUT) ::  pmc_status
456    INTEGER(iwp)                ::  bad_llcorner
457    INTEGER(iwp)                ::  i
458    INTEGER(iwp)                ::  istat
[1764]459
[1900]460    TYPE(pmc_layout), DIMENSION(pmc_max_models) ::  domain_layouts
[1764]461
[1797]462    NAMELIST /nestpar/  domain_layouts, nesting_datatransfer_mode, nesting_mode
[1764]463
464!
465!-- Initialize some coupling variables
[1900]466    domain_layouts(1:pmc_max_models)%id = -1
[1791]467    m_ncpl =   0
[1762]468
[1764]469    pmc_status = pmc_status_ok
470
471!
472!-- Open the NAMELIST-file and read the nesting layout
473    CALL check_open( 11 )
474    READ ( 11, nestpar, IOSTAT=istat )
475
476    IF ( istat < 0 )  THEN
[1933]477
[1764]478!
479!--    No nestpar-NAMELIST found
480       pmc_status = pmc_no_namelist_found
[1933]481
[1764]482!
483!--    Set filepointer to the beginning of the file. Otherwise PE0 will later
484!--    be unable to read the inipar-NAMELIST
485       REWIND ( 11 )
[1762]486       RETURN
487
[1764]488    ELSEIF ( istat > 0 )  THEN
[1933]489
[1764]490!
491!--    Errors in reading nestpar-NAMELIST
492       pmc_status = pmc_namelist_error
493       RETURN
[1762]494
[1764]495    ENDIF
[1762]496
[1764]497!
498!-- Output location message
499    CALL location_message( 'initialize communicators for nesting', .FALSE. )
[1933]500
[1764]501!
502!-- Assign the layout to the internally used variable
503    m_couplers = domain_layouts
[1762]504
[1764]505!
506!-- Get the number of nested models given in the nestpar-NAMELIST
[1900]507    DO  i = 1, pmc_max_models
[1764]508!
[1791]509!--    When id=-1 is found for the first time, the list of domains is finished
[1933]510        IF ( m_couplers(i)%id == -1  .OR.  i == pmc_max_models )  THEN
[1791]511          IF ( m_couplers(i)%id == -1 )  THEN
512             m_ncpl = i - 1
513             EXIT
514          ELSE
[1900]515             m_ncpl = pmc_max_models
[1791]516          ENDIF
[1764]517       ENDIF
518
519    ENDDO
520
[1933]521!
522!-- Make sure that all domains have equal lower left corner in case of vertical
523!-- nesting
524    IF ( nesting_mode == 'vertical' )  THEN
525       bad_llcorner = 0
526       DO  i = 1, m_ncpl
527          IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR.                    &
528               domain_layouts(i)%lower_left_y /= 0.0_wp )  THEN
529             bad_llcorner = bad_llcorner + 1
530             domain_layouts(i)%lower_left_x = 0.0_wp
531             domain_layouts(i)%lower_left_y = 0.0_wp
532          ENDIF
533       ENDDO
534       IF ( bad_llcorner /= 0)  THEN
[1938]535          WRITE ( message_string, *)  'lower left corners do not match,',       &
[1933]536                                      'they were set to (0, 0)'
537          CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
538       ENDIF
539    ENDIF
540
[1764]541 END SUBROUTINE read_coupling_layout
542
543#endif
544 END MODULE pmc_handle_communicator
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