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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 4141

Last change on this file since 4141 was 3888, checked in by hellstea, 6 years ago
bugfix in pmc_handle_communicator_mod
Property svn:keywords set to `Id`
File size: 20.5 KB

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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 gronemeier $
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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