source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 3540

Last change on this file since 3540 was 2932, checked in by maronga, 7 years ago

renamed all Fortran NAMELISTS

  • Property svn:keywords set to Id
File size: 19.5 KB
RevLine 
[2696]1!> @file pmc_handle_communicator_mod.f90
[2000]2!------------------------------------------------------------------------------!
[2696]3! This file is part of the PALM model system.
[1762]4!
[2000]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.
[1762]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!
[2718]17! Copyright 1997-2018 Leibniz Universitaet Hannover
[2000]18!------------------------------------------------------------------------------!
[1762]19!
20! Current revisions:
21! ------------------
[1851]22!
[2516]23!
[1792]24! Former revisions:
25! -----------------
26! $Id: pmc_handle_communicator_mod.f90 2932 2018-03-26 09:39:22Z gronemeier $
[2932]27! nestpar renamed to nesting_parameters
28!
29! 2841 2018-02-27 15:02:57Z knoop
[2841]30! Bugfix: wrong placement of include 'mpif.h' corrected
31!
32! 2801 2018-02-14 16:01:55Z thiele
[2801]33! Introduce particle transfer in nested models.
34!
35! 2718 2018-01-02 08:49:38Z maronga
[2716]36! Corrected "Former revisions" section
37!
38! 2696 2017-12-14 17:12:51Z kanani
39! Change in file header (GPL part)
[2696]40! Bugfix, give Intent(inout) attributes in routine reading nestpar-namelist (MS)
41!
42! 2599 2017-11-01 13:18:45Z hellstea
[2599]43! Separate peer communicator peer_comm introduced for MPI_INTERCOMM_CREATE.
44! Some cleanup and commenting improvements.
45!
46! 2516 2017-10-04 11:03:04Z suehring
[2516]47! Remove tabs
48!
49! 2514 2017-10-04 09:52:37Z suehring
[2280]50! Bugfix, set filepointer to the beginning of the file after namelist read,
51! in order to assure that further namelists are also found.
52!
53! 2279 2017-06-12 15:23:44Z suehring
[2271]54! Error message text changed
55!
56! 2101 2017-01-05 16:42:31Z suehring
[1792]57!
[2014]58! 2013 2016-09-21 13:07:56Z suehring
59! Bugfix in format descriptor
60!
[2001]61! 2000 2016-08-20 18:09:15Z knoop
62! Forced header and separation lines into 80 columns
63!
[1939]64! 1938 2016-06-13 15:26:05Z hellstea
65! Minor clean-up.
66!
[1933]67! 1901 2016-05-04 15:39:38Z raasch
68! Initial version of purely vertical nesting introduced.
69! Code clean up. The words server/client changed to parent/child.
70!
[1901]71! 1900 2016-05-04 15:27:53Z raasch
72! re-formatting to match PALM style
73!
[1883]74! 1882 2016-04-20 15:24:46Z hellstea
75! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
76! are moved out from the DO i = 1, m_ncpl loop.
77!
[1851]78! 1850 2016-04-08 13:29:27Z maronga
79! Module renamed
80!
[1809]81! 1808 2016-04-05 19:44:00Z raasch
82! MPI module used by default on all machines
83!
[1798]84! 1797 2016-03-21 16:50:28Z raasch
85! introduction of different datatransfer modes,
86! export of comm_world_nesting
87!
[1792]88! 1791 2016-03-11 10:41:25Z raasch
[1791]89! m_nrofcpl renamed m_ncpl,
90! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
91! renamed and some added,
92! debug write-statements commented out
[1765]93!
[1787]94! 1786 2016-03-08 05:49:27Z raasch
95! Bugfix: nesting_mode is broadcast now
96!
[1780]97! 1779 2016-03-03 08:01:28Z raasch
98! only the total number of PEs is given in the nestpar-NAMELIST,
99! additional comments included
100!
[1765]101! 1764 2016-02-28 12:45:19Z raasch
[1764]102! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
103! the beginning of the variable list,
104! domain layout is read with new NAMELIST nestpar from standard file PARIN,
105! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
106! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
107! general format changed to PALM style
[1762]108!
[1763]109! 1762 2016-02-25 12:31:13Z hellstea
110! Initial revision by K. Ketelsen
111!
[1762]112! Description:
113! ------------
[1764]114! Handle MPI communicator in PALM model coupler
[1933]115!-------------------------------------------------------------------------------!
[2696]116 MODULE PMC_handle_communicator
[1764]117#if defined( __parallel )
118    USE kinds
[1762]119
[2841]120#if !defined( __mpifh )
[1764]121    USE MPI
122#endif
[1762]123
[1933]124    USE pmc_general,                                                            &
[1900]125        ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
[1933]126    USE control_parameters,                                                     &
127        ONLY: message_string
[1762]128
[1900]129    IMPLICIT NONE
[1762]130
[2841]131#if defined( __mpifh )
132    INCLUDE "mpif.h"
133#endif
134
[1900]135    TYPE pmc_layout
[1762]136
[1900]137       CHARACTER(LEN=32) ::  name
[1762]138
[1900]139       INTEGER  ::  id            !<
140       INTEGER  ::  parent_id     !<
141       INTEGER  ::  npe_total     !<
[1762]142
[1900]143       REAL(wp) ::  lower_left_x  !<
144       REAL(wp) ::  lower_left_y  !<
[1762]145
[1900]146    END TYPE pmc_layout
[1764]147
[1900]148    PUBLIC  pmc_status_ok, pmc_status_error
[1764]149
[2599]150    INTEGER, PARAMETER, PUBLIC ::  pmc_error_npes        = 1  !< illegal number of processes
[2932]151    INTEGER, PARAMETER, PUBLIC ::  pmc_namelist_error    = 2  !< error(s) in nesting_parameters namelist
[1900]152    INTEGER, PARAMETER, PUBLIC ::  pmc_no_namelist_found = 3  !< no couple layout namelist found
[1764]153
[1900]154    INTEGER ::  m_world_comm  !< global nesting communicator
[2801]155    INTEGER ::  m_my_cpl_id   !< coupler id of this model
[1900]156    INTEGER ::  m_parent_id   !< coupler id of parent of this model
[2932]157    INTEGER ::  m_ncpl        !< number of couplers given in nesting_parameters namelist
[1762]158
[2801]159    TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) ::  m_couplers  !< information of all couplers
[1762]160
[1900]161    INTEGER, PUBLIC ::  m_model_comm          !< communicator of this model
[1933]162    INTEGER, PUBLIC ::  m_to_parent_comm      !< communicator to the parent
[1900]163    INTEGER, PUBLIC ::  m_world_rank          !<
164    INTEGER         ::  m_world_npes          !<
165    INTEGER, PUBLIC ::  m_model_rank          !<
166    INTEGER, PUBLIC ::  m_model_npes          !<
[2599]167    INTEGER         ::  m_parent_remote_size  !< number of processes in the parent model
168    INTEGER         ::  peer_comm             !< peer_communicator for inter communicators
[1791]169
[1933]170    INTEGER, DIMENSION(pmc_max_models), PUBLIC ::  m_to_child_comm    !< communicator to the child(ren)
171    INTEGER, DIMENSION(:), POINTER, PUBLIC ::  pmc_parent_for_child   !<
[1762]172
173
[1900]174    INTERFACE pmc_is_rootmodel
175       MODULE PROCEDURE pmc_is_rootmodel
176    END INTERFACE pmc_is_rootmodel
[1762]177
[1900]178    INTERFACE pmc_get_model_info
179       MODULE PROCEDURE pmc_get_model_info
180    END INTERFACE pmc_get_model_info
[1762]181
[1900]182    PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
[1762]183
[1764]184 CONTAINS
[1762]185
[1933]186 SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode,      &
[2696]187                            pmc_status )
[1762]188
[1933]189    USE control_parameters,                                                     &
[1900]190        ONLY:  message_string
[1764]191
[1933]192    USE pegrid,                                                                 &
[1900]193        ONLY:  myid
[1764]194
195      IMPLICIT NONE
196
[2696]197    CHARACTER(LEN=8), INTENT(INOUT) ::  nesting_mode               !<
198    CHARACTER(LEN=7), INTENT(INOUT) ::  nesting_datatransfer_mode  !<
[1764]199
[2696]200    INTEGER, INTENT(INOUT) ::  comm        !<
201    INTEGER, INTENT(INOUT) ::  pmc_status  !<
[1764]202
[1933]203    INTEGER ::  childcount     !<
[1900]204    INTEGER ::  i              !<
205    INTEGER ::  ierr           !<
206    INTEGER ::  istat          !<
207    INTEGER ::  m_my_cpl_rank  !<
208    INTEGER ::  tag            !<
[1764]209
[1933]210    INTEGER, DIMENSION(pmc_max_models)   ::  activeparent  ! I am active parent for this child ID
[1900]211    INTEGER, DIMENSION(pmc_max_models+1) ::  start_pe
[1762]212
[1900]213    pmc_status   = pmc_status_ok
214    comm         = -1
215    m_world_comm = MPI_COMM_WORLD
216    m_my_cpl_id  = -1
[1933]217    childcount   =  0
218    activeparent = -1
[1900]219    start_pe(:)  =  0
220
221    CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
222    CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
[1764]223!
[2599]224!-- Only process 0 of root model reads
[1900]225    IF ( m_world_rank == 0 )  THEN
[1762]226
[1933]227       CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
[1900]228                                  pmc_status )
[1762]229
[1933]230       IF ( pmc_status /= pmc_no_namelist_found  .AND.                          &
231            pmc_status /= pmc_namelist_error )                                  &
[1900]232       THEN
[1764]233!
[2801]234!--       Calculate start PE of every model
[1900]235          start_pe(1) = 0
236          DO  i = 2, m_ncpl+1
237             start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
238          ENDDO
[1762]239
[1764]240!
[2599]241!--       The sum of numbers of processes requested by all the domains
242!--       must be equal to the total number of processes of the run
[1900]243          IF ( start_pe(m_ncpl+1) /= m_world_npes )  THEN
[2013]244             WRITE ( message_string, '(2A,I6,2A,I6,A)' )                        &
[1933]245                             'nesting-setup requires different number of ',     &
246                             'MPI procs (', start_pe(m_ncpl+1), ') than ',      &
247                             'provided (', m_world_npes,')'
[1900]248             CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
249          ENDIF
[1762]250
[1900]251       ENDIF
[1762]252
[1900]253    ENDIF
[1764]254!
[2599]255!-- Broadcast the read status. This synchronises all other processes with
256!-- process 0 of the root model. Without synchronisation, they would not
257!-- behave in the correct way (e.g. they would not return in case of a
258!-- missing NAMELIST).
[1900]259    CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
[1762]260
[1900]261    IF ( pmc_status == pmc_no_namelist_found )  THEN
[1764]262!
[1900]263!--    Not a nested run; return the MPI_WORLD communicator
264       comm = MPI_COMM_WORLD
265       RETURN
[1762]266
[1900]267    ELSEIF ( pmc_status == pmc_namelist_error )  THEN
[1764]268!
[1900]269!--    Only the root model gives the error message. Others are aborted by the
270!--    message-routine with MPI_ABORT. Must be done this way since myid and
271!--    comm2d have not yet been assigned at this point.
272       IF ( m_world_rank == 0 )  THEN
[2932]273          message_string = 'errors in \$nesting_parameters'
[1900]274          CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
275       ENDIF
[1762]276
[1900]277    ENDIF
[1762]278
[2599]279    CALL MPI_BCAST( m_ncpl,          1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
280    CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
[1764]281!
[1900]282!-- Broadcast coupling layout
283    DO  i = 1, m_ncpl
[1933]284       CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ),           &
[1900]285                       MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
[1933]286       CALL MPI_BCAST( m_couplers(i)%id,           1, MPI_INTEGER, 0,           &
[1900]287                       MPI_COMM_WORLD, istat )
[1933]288       CALL MPI_BCAST( m_couplers(i)%Parent_id,    1, MPI_INTEGER, 0,           &
[1900]289                       MPI_COMM_WORLD, istat )
[1933]290       CALL MPI_BCAST( m_couplers(i)%npe_total,    1, MPI_INTEGER, 0,           &
[1900]291                       MPI_COMM_WORLD, istat )
[1933]292       CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL,    0,           &
[1900]293                       MPI_COMM_WORLD, istat )
[1933]294       CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL,    0,           &
[1900]295                       MPI_COMM_WORLD, istat )
296    ENDDO
[1933]297    CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0,        &
[1900]298                    MPI_COMM_WORLD, istat )
[1933]299    CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode),  &
[1900]300                    MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
[1764]301!
[1900]302!-- Assign global MPI processes to individual models by setting the couple id
303    DO  i = 1, m_ncpl
[1933]304       IF ( m_world_rank >= start_pe(i)  .AND.  m_world_rank < start_pe(i+1) )  &
[1900]305       THEN
306          m_my_cpl_id = i
307          EXIT
308       ENDIF
309    ENDDO
310    m_my_cpl_rank = m_world_rank - start_pe(i)
[1764]311!
[1900]312!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
313!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
314!-- The color of the model is represented by the coupler id
[1933]315    CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm,      &
[1900]316                         istat )
[1764]317!
[2599]318!-- Get size and rank of the model running on this process
[1900]319    CALL  MPI_COMM_RANK( comm, m_model_rank, istat )
320    CALL  MPI_COMM_SIZE( comm, m_model_npes, istat )
[1764]321!
[2599]322!-- Broadcast (from process 0) the parent id and id of every model
[1900]323    DO  i = 1, m_ncpl
[1933]324       CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0,              &
[1900]325                       MPI_COMM_WORLD, istat )
[1933]326       CALL MPI_BCAST( m_couplers(i)%id,        1, MPI_INTEGER, 0,              &
[1900]327                       MPI_COMM_WORLD, istat )
328    ENDDO
[1764]329!
[1900]330!-- Save the current model communicator for pmc internal use
331    m_model_comm = comm
[1762]332
[1764]333!
[2599]334!-- Create intercommunicator between the parent and children.
[1900]335!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
336!-- different colors.
[2599]337!-- The grouping was done above with MPI_COMM_SPLIT.
338!-- A duplicate of MPI_COMM_WORLD is created and used as peer communicator
339!-- (peer_comm) for MPI_INTERCOMM_CREATE.
340    CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr ) 
[1900]341    DO  i = 2, m_ncpl
342       IF ( m_couplers(i)%parent_id == m_my_cpl_id )  THEN
[1764]343!
[2599]344!--       Identify all children models of the current model and create
345!--       inter-communicators to connect between the current model and its
346!--       children models.
[1900]347          tag = 500 + i
[2599]348          CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i),           &
[1933]349                                     tag, m_to_child_comm(i), istat)
350          childcount = childcount + 1
351          activeparent(i) = 1
[1900]352       ELSEIF ( i == m_my_cpl_id)  THEN
[1764]353!
[2599]354!--       Create an inter-communicator to connect between the current
355!--       model and its parent model.   
[1900]356          tag = 500 + i
[2599]357          CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm,                        &
[1933]358                                     start_pe(m_couplers(i)%parent_id),         &
359                                     tag, m_to_parent_comm, istat )
[1900]360       ENDIF
361    ENDDO
[1764]362!
[2599]363!-- If I am a parent, count the number of children I have.
[1933]364!-- Although this loop is symmetric on all processes, the "activeparent" flag
[2599]365!-- is true (==1) on the respective individual process only.
[1933]366    ALLOCATE( pmc_parent_for_child(childcount+1) )
[1762]367
[1933]368    childcount = 0
[1900]369    DO  i = 2, m_ncpl
[1933]370       IF ( activeparent(i) == 1 )  THEN
371          childcount = childcount + 1
372          pmc_parent_for_child(childcount) = i
[1900]373       ENDIF
374    ENDDO
[1764]375!
[1933]376!-- Get the size of the parent model
[1900]377    IF ( m_my_cpl_id > 1 )  THEN
[1933]378       CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size,       &
[2599]379                                  istat )
[1900]380    ELSE
[1764]381!
[1933]382!--    The root model does not have a parent
383       m_parent_remote_size = -1
[1900]384    ENDIF
[1764]385!
[2599]386!-- Set myid to non-zero value except for the root domain. This is a setting
[1900]387!-- for the message routine which is called at the end of pmci_init. That
388!-- routine outputs messages for myid = 0, only. However, myid has not been
[2599]389!-- assigened so far, so that all processes of the root model would output a
390!-- message. To avoid this, set myid to some other value except for process 0
391!-- of the root domain.
[1900]392    IF ( m_world_rank /= 0 )  myid = 1
[1762]393
[1900]394 END SUBROUTINE PMC_init_model
[1762]395
396
[1900]397
[1933]398 SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name,           &
399                                cpl_parent_id, lower_left_x, lower_left_y,      &
[1900]400                                ncpl, npe_total, request_for_cpl_id )
[1764]401!
[1791]402!-- Provide module private variables of the pmc for PALM
[1762]403
[1900]404    USE kinds
[1762]405
[1900]406    IMPLICIT NONE
[1762]407
[1933]408    CHARACTER(LEN=*), INTENT(OUT), OPTIONAL ::  cpl_name   !<
[1762]409
[1933]410    INTEGER, INTENT(IN), OPTIONAL ::  request_for_cpl_id   !<
[1762]411
[1900]412    INTEGER, INTENT(OUT), OPTIONAL ::  comm_world_nesting  !<
413    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_id              !<
414    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_parent_id       !<
415    INTEGER, INTENT(OUT), OPTIONAL ::  ncpl                !<
416    INTEGER, INTENT(OUT), OPTIONAL ::  npe_total           !<
[1762]417
[2599]418    INTEGER ::  requested_cpl_id                           !<
[1764]419
[2599]420    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_x       !<
421    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_y       !<
[1764]422
[1791]423!
[1900]424!-- Set the requested coupler id
425    IF ( PRESENT( request_for_cpl_id ) )  THEN
426       requested_cpl_id = request_for_cpl_id
[1791]427!
[1900]428!--    Check for allowed range of values
429       IF ( requested_cpl_id < 1  .OR.  requested_cpl_id > m_ncpl )  RETURN
430    ELSE
431       requested_cpl_id = m_my_cpl_id
432    ENDIF
[1791]433!
[1900]434!-- Return the requested information
435    IF ( PRESENT( comm_world_nesting )  )  THEN
436       comm_world_nesting = m_world_comm
437    ENDIF
438    IF ( PRESENT( cpl_id )        )  THEN
439       cpl_id = requested_cpl_id
440    ENDIF
441    IF ( PRESENT( cpl_parent_id ) )  THEN
442       cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
443    ENDIF
444    IF ( PRESENT( cpl_name )      )  THEN
445       cpl_name = m_couplers(requested_cpl_id)%name
446    ENDIF
447    IF ( PRESENT( ncpl )          )  THEN
448       ncpl = m_ncpl
449    ENDIF
450    IF ( PRESENT( npe_total )     )  THEN
451       npe_total = m_couplers(requested_cpl_id)%npe_total
452    ENDIF
453    IF ( PRESENT( lower_left_x )  )  THEN
454       lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
455    ENDIF
456    IF ( PRESENT( lower_left_y )  )  THEN
457       lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
458    ENDIF
[1791]459
[1900]460 END SUBROUTINE pmc_get_model_info
[1791]461
462
463
[1900]464 LOGICAL function pmc_is_rootmodel( )
[1764]465
[1900]466    IMPLICIT NONE
[1764]467
[1900]468    pmc_is_rootmodel = ( m_my_cpl_id == 1 )
[1764]469
[1900]470 END FUNCTION pmc_is_rootmodel
[1764]471
472
473
[1933]474 SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
[2599]475      pmc_status )
[1762]476
[1764]477    IMPLICIT NONE
[1762]478
[1933]479    CHARACTER(LEN=8), INTENT(INOUT) ::  nesting_mode
[1797]480    CHARACTER(LEN=7), INTENT(INOUT) ::  nesting_datatransfer_mode
[1764]481
[1933]482    INTEGER(iwp), INTENT(INOUT) ::  pmc_status
483    INTEGER(iwp)                ::  bad_llcorner
484    INTEGER(iwp)                ::  i
485    INTEGER(iwp)                ::  istat
[1764]486
[1900]487    TYPE(pmc_layout), DIMENSION(pmc_max_models) ::  domain_layouts
[1764]488
[2932]489    NAMELIST /nesting_parameters/  domain_layouts, nesting_datatransfer_mode,  &
490                                   nesting_mode
491   
[1764]492!
493!-- Initialize some coupling variables
[1900]494    domain_layouts(1:pmc_max_models)%id = -1
[1791]495    m_ncpl =   0
[1762]496
[1764]497    pmc_status = pmc_status_ok
498!
499!-- Open the NAMELIST-file and read the nesting layout
500    CALL check_open( 11 )
[2932]501    READ ( 11, nesting_parameters, IOSTAT=istat )
[2279]502!
[2599]503!-- Set filepointer to the beginning of the file. Otherwise process 0 will later
[2279]504!-- be unable to read the inipar-NAMELIST
505    REWIND ( 11 )
[1764]506
507    IF ( istat < 0 )  THEN
508!
[2932]509!--    No nesting_parameters-NAMELIST found
[1764]510       pmc_status = pmc_no_namelist_found
[1762]511       RETURN
[1764]512    ELSEIF ( istat > 0 )  THEN
513!
[2932]514!--    Errors in reading nesting_parameters-NAMELIST
[1764]515       pmc_status = pmc_namelist_error
516       RETURN
517    ENDIF
518!
519!-- Output location message
520    CALL location_message( 'initialize communicators for nesting', .FALSE. )
521!
[2599]522!-- Assign the layout to the corresponding internally used variable m_couplers
[1764]523    m_couplers = domain_layouts
524!
[2932]525!-- Get the number of nested models given in the nesting_parameters-NAMELIST
[1900]526    DO  i = 1, pmc_max_models
[1764]527!
[1791]528!--    When id=-1 is found for the first time, the list of domains is finished
[2599]529       IF ( m_couplers(i)%id == -1  .OR.  i == pmc_max_models )  THEN
[1791]530          IF ( m_couplers(i)%id == -1 )  THEN
531             m_ncpl = i - 1
532             EXIT
533          ELSE
[1900]534             m_ncpl = pmc_max_models
[1791]535          ENDIF
[1764]536       ENDIF
537    ENDDO
[1933]538!
539!-- Make sure that all domains have equal lower left corner in case of vertical
540!-- nesting
541    IF ( nesting_mode == 'vertical' )  THEN
542       bad_llcorner = 0
543       DO  i = 1, m_ncpl
544          IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR.                    &
545               domain_layouts(i)%lower_left_y /= 0.0_wp )  THEN
546             bad_llcorner = bad_llcorner + 1
547             domain_layouts(i)%lower_left_x = 0.0_wp
548             domain_layouts(i)%lower_left_y = 0.0_wp
549          ENDIF
550       ENDDO
551       IF ( bad_llcorner /= 0)  THEN
[2271]552          WRITE ( message_string, *)  'at least one dimension of lower ',       &
[2514]553                                      'left corner of one domain is not 0. ',   &
[2271]554                                      'All lower left corners were set to (0, 0)'
[1933]555          CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
556       ENDIF
557    ENDIF
558
[1764]559 END SUBROUTINE read_coupling_layout
560
561#endif
562 END MODULE pmc_handle_communicator
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