source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 2280

Last change on this file since 2280 was 2280, checked in by suehring, 7 years ago

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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!
[2101]18! Copyright 1997-2017 Leibniz Universitaet Hannover
[2000]19!------------------------------------------------------------------------------!
[1762]20!
21! Current revisions:
22! ------------------
[1851]23!
[2280]24!
[1792]25! Former revisions:
26! -----------------
27! $Id: pmc_handle_communicator_mod.f90 2280 2017-06-12 15:24:42Z suehring $
[2280]28! Bugfix, set filepointer to the beginning of the file after namelist read,
29! in order to assure that further namelists are also found.
30!
31! 2279 2017-06-12 15:23:44Z suehring
[2271]32! Error message text changed
33!
34! 2101 2017-01-05 16:42:31Z suehring
[1792]35!
[2014]36! 2013 2016-09-21 13:07:56Z suehring
37! Bugfix in format descriptor
38!
[2001]39! 2000 2016-08-20 18:09:15Z knoop
40! Forced header and separation lines into 80 columns
41!
[1939]42! 1938 2016-06-13 15:26:05Z hellstea
43! Minor clean-up.
44!
[1933]45! 1901 2016-05-04 15:39:38Z raasch
46! Initial version of purely vertical nesting introduced.
47! Code clean up. The words server/client changed to parent/child.
48!
[1901]49! 1900 2016-05-04 15:27:53Z raasch
50! re-formatting to match PALM style
51!
[1883]52! 1882 2016-04-20 15:24:46Z hellstea
53! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
54! are moved out from the DO i = 1, m_ncpl loop.
55!
[1851]56! 1850 2016-04-08 13:29:27Z maronga
57! Module renamed
58!
[1809]59! 1808 2016-04-05 19:44:00Z raasch
60! MPI module used by default on all machines
61!
[1798]62! 1797 2016-03-21 16:50:28Z raasch
63! introduction of different datatransfer modes,
64! export of comm_world_nesting
65!
[1792]66! 1791 2016-03-11 10:41:25Z raasch
[1791]67! m_nrofcpl renamed m_ncpl,
68! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
69! renamed and some added,
70! debug write-statements commented out
[1765]71!
[1787]72! 1786 2016-03-08 05:49:27Z raasch
73! Bugfix: nesting_mode is broadcast now
74!
[1780]75! 1779 2016-03-03 08:01:28Z raasch
76! only the total number of PEs is given in the nestpar-NAMELIST,
77! additional comments included
78!
[1765]79! 1764 2016-02-28 12:45:19Z raasch
[1764]80! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
81! the beginning of the variable list,
82! domain layout is read with new NAMELIST nestpar from standard file PARIN,
83! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
84! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
85! general format changed to PALM style
[1762]86!
[1763]87! 1762 2016-02-25 12:31:13Z hellstea
88! Initial revision by K. Ketelsen
89!
[1762]90! Description:
91! ------------
[1764]92! Handle MPI communicator in PALM model coupler
[1933]93!-------------------------------------------------------------------------------!
[1762]94
[1764]95#if defined( __parallel )
96    USE kinds
[1762]97
[1808]98#if defined( __mpifh )
99    INCLUDE "mpif.h"
100#else
[1764]101    USE MPI
102#endif
[1762]103
[1933]104    USE pmc_general,                                                            &
[1900]105        ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
[1933]106    USE control_parameters,                                                     &
107        ONLY: message_string
[1762]108
[1900]109    IMPLICIT NONE
[1762]110
[1900]111    TYPE pmc_layout
[1762]112
[1900]113       CHARACTER(LEN=32) ::  name
[1762]114
[1900]115       INTEGER  ::  id            !<
116       INTEGER  ::  parent_id     !<
117       INTEGER  ::  npe_total     !<
[1762]118
[1900]119       REAL(wp) ::  lower_left_x  !<
120       REAL(wp) ::  lower_left_y  !<
[1762]121
[1900]122    END TYPE pmc_layout
[1764]123
[1900]124    PUBLIC  pmc_status_ok, pmc_status_error
[1764]125
[1900]126    INTEGER, PARAMETER, PUBLIC ::  pmc_error_npes        = 1  !< illegal number of PEs
127    INTEGER, PARAMETER, PUBLIC ::  pmc_namelist_error    = 2  !< error(s) in nestpar namelist
128    INTEGER, PARAMETER, PUBLIC ::  pmc_no_namelist_found = 3  !< no couple layout namelist found
[1764]129
[1900]130    INTEGER ::  m_world_comm  !< global nesting communicator
[2279]131    INTEGER ::  m_my_cpl_id   !< coupler id of this modelfortran return
[1900]132    INTEGER ::  m_parent_id   !< coupler id of parent of this model
133    INTEGER ::  m_ncpl        !< number of couplers given in nestpar namelist
[1762]134
[1900]135    TYPE(pmc_layout), DIMENSION(pmc_max_models) ::  m_couplers  !< information of all couplers
[1762]136
[1900]137    INTEGER, PUBLIC ::  m_model_comm          !< communicator of this model
[1933]138    INTEGER, PUBLIC ::  m_to_parent_comm      !< communicator to the parent
[1900]139    INTEGER, PUBLIC ::  m_world_rank          !<
140    INTEGER         ::  m_world_npes          !<
141    INTEGER, PUBLIC ::  m_model_rank          !<
142    INTEGER, PUBLIC ::  m_model_npes          !<
[1933]143    INTEGER         ::  m_parent_remote_size  !< number of parent PEs
[1791]144
[1933]145    INTEGER, DIMENSION(pmc_max_models), PUBLIC ::  m_to_child_comm    !< communicator to the child(ren)
146    INTEGER, DIMENSION(:), POINTER, PUBLIC ::  pmc_parent_for_child   !<
[1762]147
148
[1900]149    INTERFACE pmc_is_rootmodel
150       MODULE PROCEDURE pmc_is_rootmodel
151    END INTERFACE pmc_is_rootmodel
[1762]152
[1900]153    INTERFACE pmc_get_model_info
154       MODULE PROCEDURE pmc_get_model_info
155    END INTERFACE pmc_get_model_info
[1762]156
[1900]157    PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
[1762]158
[1764]159 CONTAINS
[1762]160
[1933]161 SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode,      &
[1797]162                              pmc_status )
[1762]163
[1933]164    USE control_parameters,                                                     &
[1900]165        ONLY:  message_string
[1764]166
[1933]167    USE pegrid,                                                                 &
[1900]168        ONLY:  myid
[1764]169
170      IMPLICIT NONE
171
[1933]172    CHARACTER(LEN=8), INTENT(OUT) ::  nesting_mode               !<
[1900]173    CHARACTER(LEN=7), INTENT(OUT) ::  nesting_datatransfer_mode  !<
[1764]174
[1900]175    INTEGER, INTENT(OUT) ::  comm        !<
176    INTEGER, INTENT(OUT) ::  pmc_status  !<
[1764]177
[1933]178    INTEGER ::  childcount     !<
[1900]179    INTEGER ::  i              !<
180    INTEGER ::  ierr           !<
181    INTEGER ::  istat          !<
182    INTEGER ::  m_my_cpl_rank  !<
183    INTEGER ::  tag            !<
[1764]184
[1933]185    INTEGER, DIMENSION(pmc_max_models)   ::  activeparent  ! I am active parent for this child ID
[1900]186    INTEGER, DIMENSION(pmc_max_models+1) ::  start_pe
[1762]187
[1900]188    pmc_status   = pmc_status_ok
189    comm         = -1
190    m_world_comm = MPI_COMM_WORLD
191    m_my_cpl_id  = -1
[1933]192    childcount   =  0
193    activeparent = -1
[1900]194    start_pe(:)  =  0
195
196    CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
197    CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
[1764]198!
[1900]199!-- Only PE 0 of root model reads
200    IF ( m_world_rank == 0 )  THEN
[1762]201
[1933]202       CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
[1900]203                                  pmc_status )
[1762]204
[1933]205       IF ( pmc_status /= pmc_no_namelist_found  .AND.                          &
206            pmc_status /= pmc_namelist_error )                                  &
[1900]207       THEN
[1764]208!
[1900]209!--       Calculate start PE of every model
210          start_pe(1) = 0
211          DO  i = 2, m_ncpl+1
212             start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
213          ENDDO
[1762]214
[1764]215!
[1900]216!--       The number of cores provided with the run must be the same as the
217!--       total sum of cores required by all nest domains
218          IF ( start_pe(m_ncpl+1) /= m_world_npes )  THEN
[2013]219             WRITE ( message_string, '(2A,I6,2A,I6,A)' )                        &
[1933]220                             'nesting-setup requires different number of ',     &
221                             'MPI procs (', start_pe(m_ncpl+1), ') than ',      &
222                             'provided (', m_world_npes,')'
[1900]223             CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
224          ENDIF
[1762]225
[1900]226       ENDIF
[1762]227
[1900]228    ENDIF
[1764]229!
[1900]230!-- Broadcast the read status. This synchronises all other PEs with PE 0 of
231!-- the root model. Without synchronisation, they would not behave in the
232!-- correct way (e.g. they would not return in case of a missing NAMELIST)
233    CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
[1762]234
[1900]235    IF ( pmc_status == pmc_no_namelist_found )  THEN
[1764]236!
[1900]237!--    Not a nested run; return the MPI_WORLD communicator
238       comm = MPI_COMM_WORLD
239       RETURN
[1762]240
[1900]241    ELSEIF ( pmc_status == pmc_namelist_error )  THEN
[1764]242!
[1900]243!--    Only the root model gives the error message. Others are aborted by the
244!--    message-routine with MPI_ABORT. Must be done this way since myid and
245!--    comm2d have not yet been assigned at this point.
246       IF ( m_world_rank == 0 )  THEN
247          message_string = 'errors in \$nestpar'
248          CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
249       ENDIF
[1762]250
[1900]251    ENDIF
[1762]252
[1900]253    CALL MPI_BCAST( m_ncpl,          1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
254    CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
[1762]255
[1764]256!
[1900]257!-- Broadcast coupling layout
258    DO  i = 1, m_ncpl
[1933]259       CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ),           &
[1900]260                       MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
[1933]261       CALL MPI_BCAST( m_couplers(i)%id,           1, MPI_INTEGER, 0,           &
[1900]262                       MPI_COMM_WORLD, istat )
[1933]263       CALL MPI_BCAST( m_couplers(i)%Parent_id,    1, MPI_INTEGER, 0,           &
[1900]264                       MPI_COMM_WORLD, istat )
[1933]265       CALL MPI_BCAST( m_couplers(i)%npe_total,    1, MPI_INTEGER, 0,           &
[1900]266                       MPI_COMM_WORLD, istat )
[1933]267       CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL,    0,           &
[1900]268                       MPI_COMM_WORLD, istat )
[1933]269       CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL,    0,           &
[1900]270                       MPI_COMM_WORLD, istat )
271    ENDDO
[1933]272    CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0,        &
[1900]273                    MPI_COMM_WORLD, istat )
[1933]274    CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode),  &
[1900]275                    MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
[1762]276
[1764]277!
[1900]278!-- Assign global MPI processes to individual models by setting the couple id
279    DO  i = 1, m_ncpl
[1933]280       IF ( m_world_rank >= start_pe(i)  .AND.  m_world_rank < start_pe(i+1) )  &
[1900]281       THEN
282          m_my_cpl_id = i
283          EXIT
284       ENDIF
285    ENDDO
286    m_my_cpl_rank = m_world_rank - start_pe(i)
[1762]287
[1764]288!
[1900]289!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
290!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
291!-- The color of the model is represented by the coupler id
[1933]292    CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm,      &
[1900]293                         istat )
[1764]294!
[1900]295!-- Get size and rank of the model running on this PE
296    CALL  MPI_COMM_RANK( comm, m_model_rank, istat )
297    CALL  MPI_COMM_SIZE( comm, m_model_npes, istat )
[1762]298
[1764]299!
[1900]300!-- Broadcast (from PE 0) the parent id and id of every model
301    DO  i = 1, m_ncpl
[1933]302       CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0,              &
[1900]303                       MPI_COMM_WORLD, istat )
[1933]304       CALL MPI_BCAST( m_couplers(i)%id,        1, MPI_INTEGER, 0,              &
[1900]305                       MPI_COMM_WORLD, istat )
306    ENDDO
[1762]307
[1764]308!
[1900]309!-- Save the current model communicator for pmc internal use
310    m_model_comm = comm
[1762]311
[1764]312!
[1933]313!-- Create intercommunicator between parent and children.
[1900]314!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
315!-- different colors.
316!-- The grouping was done above with MPI_COMM_SPLIT
317    DO  i = 2, m_ncpl
[1762]318
[1900]319       IF ( m_couplers(i)%parent_id == m_my_cpl_id )  THEN
[1764]320!
[1933]321!--       Collect parent PEs.
[1900]322!--       Every model exept the root model has a parent model which acts as
[1933]323!--       parent model. Create an intercommunicator to connect current PE to
324!--       all children PEs
[1900]325          tag = 500 + i
[1933]326          CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD, start_pe(i),      &
327                                     tag, m_to_child_comm(i), istat)
328          childcount = childcount + 1
329          activeparent(i) = 1
[1762]330
[1900]331       ELSEIF ( i == m_my_cpl_id)  THEN
[1764]332!
[1933]333!--       Collect children PEs.
334!--       Every model except the root model has a parent model.
335!--       Create an intercommunicator to connect current PE to all parent PEs
[1900]336          tag = 500 + i
[1933]337          CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD,                   &
338                                     start_pe(m_couplers(i)%parent_id),         &
339                                     tag, m_to_parent_comm, istat )
[1900]340       ENDIF
[1762]341
[1900]342    ENDDO
[1762]343
[1764]344!
[1933]345!-- If I am parent, count the number of children that I have
346!-- Although this loop is symmetric on all processes, the "activeparent" flag
[1900]347!-- is true (==1) on the respective individual PE only.
[1933]348    ALLOCATE( pmc_parent_for_child(childcount+1) )
[1762]349
[1933]350    childcount = 0
[1900]351    DO  i = 2, m_ncpl
[1933]352       IF ( activeparent(i) == 1 )  THEN
353          childcount = childcount + 1
354          pmc_parent_for_child(childcount) = i
[1900]355       ENDIF
356    ENDDO
[1764]357!
[1933]358!-- Get the size of the parent model
[1900]359    IF ( m_my_cpl_id > 1 )  THEN
[1933]360       CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size,       &
[1900]361                                  istat)
362    ELSE
[1764]363!
[1933]364!--    The root model does not have a parent
365       m_parent_remote_size = -1
[1900]366    ENDIF
[1764]367!
[1900]368!-- Set myid to non-tero value except for the root domain. This is a setting
369!-- for the message routine which is called at the end of pmci_init. That
370!-- routine outputs messages for myid = 0, only. However, myid has not been
371!-- assigened so far, so that all PEs of the root model would output a
372!-- message. To avoid this, set myid to some other value except for PE0 of the
373!-- root domain.
374    IF ( m_world_rank /= 0 )  myid = 1
[1762]375
[1900]376 END SUBROUTINE PMC_init_model
[1762]377
378
[1900]379
[1933]380 SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name,           &
381                                cpl_parent_id, lower_left_x, lower_left_y,      &
[1900]382                                ncpl, npe_total, request_for_cpl_id )
[1764]383!
[1791]384!-- Provide module private variables of the pmc for PALM
[1762]385
[1900]386    USE kinds
[1762]387
[1900]388    IMPLICIT NONE
[1762]389
[1933]390    CHARACTER(LEN=*), INTENT(OUT), OPTIONAL ::  cpl_name   !<
[1762]391
[1933]392    INTEGER, INTENT(IN), OPTIONAL ::  request_for_cpl_id   !<
[1762]393
[1900]394    INTEGER, INTENT(OUT), OPTIONAL ::  comm_world_nesting  !<
395    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_id              !<
396    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_parent_id       !<
397    INTEGER, INTENT(OUT), OPTIONAL ::  ncpl                !<
398    INTEGER, INTENT(OUT), OPTIONAL ::  npe_total           !<
[1762]399
[1900]400    INTEGER ::  requested_cpl_id  !<
[1764]401
[1900]402    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_x  !<
403    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_y  !<
[1764]404
[1791]405!
[1900]406!-- Set the requested coupler id
407    IF ( PRESENT( request_for_cpl_id ) )  THEN
408       requested_cpl_id = request_for_cpl_id
[1791]409!
[1900]410!--    Check for allowed range of values
411       IF ( requested_cpl_id < 1  .OR.  requested_cpl_id > m_ncpl )  RETURN
412    ELSE
413       requested_cpl_id = m_my_cpl_id
414    ENDIF
[1791]415
416!
[1900]417!-- Return the requested information
418    IF ( PRESENT( comm_world_nesting )  )  THEN
419       comm_world_nesting = m_world_comm
420    ENDIF
421    IF ( PRESENT( cpl_id )        )  THEN
422       cpl_id = requested_cpl_id
423    ENDIF
424    IF ( PRESENT( cpl_parent_id ) )  THEN
425       cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
426    ENDIF
427    IF ( PRESENT( cpl_name )      )  THEN
428       cpl_name = m_couplers(requested_cpl_id)%name
429    ENDIF
430    IF ( PRESENT( ncpl )          )  THEN
431       ncpl = m_ncpl
432    ENDIF
433    IF ( PRESENT( npe_total )     )  THEN
434       npe_total = m_couplers(requested_cpl_id)%npe_total
435    ENDIF
436    IF ( PRESENT( lower_left_x )  )  THEN
437       lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
438    ENDIF
439    IF ( PRESENT( lower_left_y )  )  THEN
440       lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
441    ENDIF
[1791]442
[1900]443 END SUBROUTINE pmc_get_model_info
[1791]444
445
446
[1900]447 LOGICAL function pmc_is_rootmodel( )
[1764]448
[1900]449    IMPLICIT NONE
[1764]450
[1900]451    pmc_is_rootmodel = ( m_my_cpl_id == 1 )
[1764]452
[1900]453 END FUNCTION pmc_is_rootmodel
[1764]454
455
456
[1933]457 SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
[1797]458                                  pmc_status )
[1762]459
[1764]460    IMPLICIT NONE
[1762]461
[1933]462    CHARACTER(LEN=8), INTENT(INOUT) ::  nesting_mode
[1797]463    CHARACTER(LEN=7), INTENT(INOUT) ::  nesting_datatransfer_mode
[1764]464
[1933]465    INTEGER(iwp), INTENT(INOUT) ::  pmc_status
466    INTEGER(iwp)                ::  bad_llcorner
467    INTEGER(iwp)                ::  i
468    INTEGER(iwp)                ::  istat
[1764]469
[1900]470    TYPE(pmc_layout), DIMENSION(pmc_max_models) ::  domain_layouts
[1764]471
[1797]472    NAMELIST /nestpar/  domain_layouts, nesting_datatransfer_mode, nesting_mode
[1764]473
474!
475!-- Initialize some coupling variables
[1900]476    domain_layouts(1:pmc_max_models)%id = -1
[1791]477    m_ncpl =   0
[1762]478
[1764]479    pmc_status = pmc_status_ok
480
481!
482!-- Open the NAMELIST-file and read the nesting layout
483    CALL check_open( 11 )
484    READ ( 11, nestpar, IOSTAT=istat )
[2279]485!
486!-- Set filepointer to the beginning of the file. Otherwise PE0 will later
487!-- be unable to read the inipar-NAMELIST
488    REWIND ( 11 )
[1764]489
490    IF ( istat < 0 )  THEN
[1933]491
[1764]492!
493!--    No nestpar-NAMELIST found
494       pmc_status = pmc_no_namelist_found
[1933]495
[1762]496       RETURN
497
[1764]498    ELSEIF ( istat > 0 )  THEN
[1933]499
[1764]500!
501!--    Errors in reading nestpar-NAMELIST
502       pmc_status = pmc_namelist_error
503       RETURN
[1762]504
[1764]505    ENDIF
[1762]506
[1764]507!
508!-- Output location message
509    CALL location_message( 'initialize communicators for nesting', .FALSE. )
[1933]510
[1764]511!
512!-- Assign the layout to the internally used variable
513    m_couplers = domain_layouts
[1762]514
[1764]515!
516!-- Get the number of nested models given in the nestpar-NAMELIST
[1900]517    DO  i = 1, pmc_max_models
[1764]518!
[1791]519!--    When id=-1 is found for the first time, the list of domains is finished
[1933]520        IF ( m_couplers(i)%id == -1  .OR.  i == pmc_max_models )  THEN
[1791]521          IF ( m_couplers(i)%id == -1 )  THEN
522             m_ncpl = i - 1
523             EXIT
524          ELSE
[1900]525             m_ncpl = pmc_max_models
[1791]526          ENDIF
[1764]527       ENDIF
528
529    ENDDO
530
[1933]531!
532!-- Make sure that all domains have equal lower left corner in case of vertical
533!-- nesting
534    IF ( nesting_mode == 'vertical' )  THEN
535       bad_llcorner = 0
536       DO  i = 1, m_ncpl
537          IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR.                    &
538               domain_layouts(i)%lower_left_y /= 0.0_wp )  THEN
539             bad_llcorner = bad_llcorner + 1
540             domain_layouts(i)%lower_left_x = 0.0_wp
541             domain_layouts(i)%lower_left_y = 0.0_wp
542          ENDIF
543       ENDDO
544       IF ( bad_llcorner /= 0)  THEN
[2271]545          WRITE ( message_string, *)  'at least one dimension of lower ',       &
546                                      'left corner of one domain is not 0. ',   &
547                                      'All lower left corners were set to (0, 0)'
[1933]548          CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
549       ENDIF
550    ENDIF
551
[1764]552 END SUBROUTINE read_coupling_layout
553
554#endif
555 END MODULE pmc_handle_communicator
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