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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 4748

Last change on this file since 4748 was 4650, checked in by raasch, 4 years ago
bugfix for r4649
Property svn:keywords set to `Id`
File size: 19.7 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 terms of the GNU General
6	! Public License as published by the Free Software Foundation, either version 3 of the License, or
7	! (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
10	! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
11	! Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with PALM. If not, see
14	! <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2020 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------------------------!
18	!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: pmc_handle_communicator_mod.f90 4650 2020-08-25 14:35:50Z pavelkrc $
27	! bugfix for r4649
28	!
29	! 4649 2020-08-25 12:11:17Z raasch
30	! File re-formatted to follow the PALM coding standard
31	!
32	!
33	! 4629 2020-07-29 09:37:56Z raasch
34	! Support for MPI Fortran77 interface (mpif.h) removed
35	!
36	! 4360 2020-01-07 11:25:50Z suehring
37	! Corrected "Former revisions" section
38	!
39	! 3888 2019-04-12 09:18:10Z hellstea
40	! Missing MPI_BCAST of anterpolation_buffer_width added.
41	!
42	! 3885 2019-04-11 11:29:34Z kanani
43	! Changes related to global restructuring of location messages and introduction of additional debug
44	! messages
45	!
46	! 3819 2019-03-27 11:01:36Z hellstea
47	! Adjustable anterpolation buffer introduced on all nest boundaries, it is controlled by the new
48	! nesting_parameters parameter anterpolation_buffer_width.
49	!
50	! 3655 2019-01-07 16:51:22Z knoop
51	! nestpar renamed to nesting_parameters
52	!
53	! 1762 2016-02-25 12:31:13Z hellstea
54	! Initial revision by K. Ketelsen
55	!
56	! Description:
57	! ------------
58	! Handle MPI communicator in PALM model coupler
59	!--------------------------------------------------------------------------------------------------!
60	MODULE PMC_handle_communicator
61	#if defined( __parallel )
62	USE kinds
63
64	USE MPI
65
66	USE pmc_general, &
67	ONLY: pmc_max_models, &
68	pmc_status_error, &
69	pmc_status_ok
70
71
72	USE control_parameters, &
73	ONLY: message_string
74
75	IMPLICIT NONE
76
77	!
78	!-- ATTENTION: Do not change the order of variable declarations in the following TYPE definition,
79	!-- because the order must follow the order in which the layout data is given in the NAMELIST file.
80	TYPE pmc_layout
81
82	CHARACTER(LEN=32) :: name !<
83
84	INTEGER :: id !<
85	INTEGER :: parent_id !<
86	INTEGER :: npe_total !<
87
88	REAL(wp) :: lower_left_x !<
89	REAL(wp) :: lower_left_y !<
90
91	END TYPE pmc_layout
92
93	PUBLIC pmc_status_ok, pmc_status_error !<
94
95	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of processes
96	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nesting_parameters namelist
97	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
98
99	INTEGER :: m_my_cpl_id !< coupler id of this model
100	INTEGER :: m_ncpl !< number of couplers given in nesting_parameters namelist
101	INTEGER :: m_parent_id !< coupler id of parent of this model
102	INTEGER :: m_world_comm !< global nesting communicator
103
104	TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
105
106	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
107	INTEGER, PUBLIC :: m_model_npes !<
108	INTEGER, PUBLIC :: m_model_rank !<
109	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
110	INTEGER, PUBLIC :: m_world_rank !<
111	INTEGER :: m_parent_remote_size !< number of processes in the parent model
112	INTEGER :: m_world_npes !<
113	INTEGER :: peer_comm !< peer_communicator for inter communicators
114
115	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
116	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
117
118
119	INTERFACE pmc_get_model_info
120	MODULE PROCEDURE pmc_get_model_info
121	END INTERFACE pmc_get_model_info
122
123	INTERFACE pmc_is_rootmodel
124	MODULE PROCEDURE pmc_is_rootmodel
125	END INTERFACE pmc_is_rootmodel
126
127	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel !<
128
129
130
131	CONTAINS
132
133
134	!--------------------------------------------------------------------------------------------------!
135	! Description:
136	! ------------
137	!> @Todo: Missing subroutine description.
138	!--------------------------------------------------------------------------------------------------!
139	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
140	anterpolation_buffer_width, pmc_status )
141
142	USE control_parameters, &
143	ONLY: message_string
144
145	USE pegrid, &
146	ONLY: myid
147
148	IMPLICIT NONE
149
150	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
151	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
152
153	INTEGER, INTENT(INOUT) :: anterpolation_buffer_width !< Boundary buffer width for anterpolation
154	INTEGER, INTENT(INOUT) :: comm !<
155	INTEGER, INTENT(INOUT) :: pmc_status !<
156
157	INTEGER :: childcount !<
158	INTEGER :: i !<
159	INTEGER :: ierr !<
160	INTEGER :: istat !<
161	INTEGER :: m_my_cpl_rank !<
162	INTEGER :: tag !<
163
164	INTEGER, DIMENSION(pmc_max_models) :: activeparent !< I am active parent for this child ID
165	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe !<
166
167	pmc_status = pmc_status_ok
168	comm = -1
169	m_world_comm = MPI_COMM_WORLD
170	m_my_cpl_id = -1
171	childcount = 0
172	activeparent = -1
173	start_pe(:) = 0
174
175	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
176	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
177	!
178	!-- Only process 0 of root model reads
179	IF ( m_world_rank == 0 ) THEN
180
181	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
182	anterpolation_buffer_width, pmc_status )
183
184	IF ( pmc_status /= pmc_no_namelist_found .AND. &
185	pmc_status /= pmc_namelist_error ) &
186	THEN
187	!
188	!-- Calculate start PE of every model
189	start_pe(1) = 0
190	DO i = 2, m_ncpl+1
191	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
192	ENDDO
193
194	!
195	!-- The sum of numbers of processes requested by all the domains must be equal to the total
196	!-- number of processes of the run
197	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
198	WRITE( message_string, '(2A,I6,2A,I6,A)' ) &
199	'nesting-setup requires different number of ', &
200	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
201	'provided (', m_world_npes,')'
202	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
203	ENDIF
204
205	ENDIF
206
207	ENDIF
208	!
209	!-- Broadcast the read status. This synchronises all other processes with process 0 of the root
210	!-- model. Without synchronisation, they would not behave in the correct way (e.g. they would not
211	!-- return in case of a missing NAMELIST).
212	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
213
214	IF ( pmc_status == pmc_no_namelist_found ) THEN
215	!
216	!-- Not a nested run; return the MPI_WORLD communicator
217	comm = MPI_COMM_WORLD
218	RETURN
219
220	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
221	!
222	!-- Only the root model gives the error message. Others are aborted by the message-routine with
223	!-- MPI_ABORT. Must be done this way since myid and comm2d have not yet been assigned at this
224	!-- point.
225	IF ( m_world_rank == 0 ) THEN
226	message_string = 'errors in \$nesting_parameters'
227	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
228	ENDIF
229
230	ENDIF
231
232	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
233	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
234	!
235	!-- Broadcast coupling layout
236	DO i = 1, m_ncpl
237	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
238	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
239	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
240	MPI_COMM_WORLD, istat )
241	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
242	MPI_COMM_WORLD, istat )
243	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
244	MPI_COMM_WORLD, istat )
245	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
246	MPI_COMM_WORLD, istat )
247	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
248	MPI_COMM_WORLD, istat )
249	ENDDO
250	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
251	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), MPI_CHARACTER, 0, &
252	MPI_COMM_WORLD, istat )
253	CALL MPI_BCAST( anterpolation_buffer_width, 1, MPI_INT, 0, MPI_COMM_WORLD, istat )
254	!
255	!-- Assign global MPI processes to individual models by setting the couple id
256	DO i = 1, m_ncpl
257	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) THEN
258	m_my_cpl_id = i
259	EXIT
260	ENDIF
261	ENDDO
262	m_my_cpl_rank = m_world_rank - start_pe(i)
263	!
264	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach). The communictors for the
265	!-- individual models as created by MPI_COMM_SPLIT. The color of the model is represented by the
266	!-- coupler id
267	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, istat )
268	!
269	!-- Get size and rank of the model running on this process
270	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
271	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
272	!
273	!-- Broadcast (from process 0) the parent id and id of every model
274	DO i = 1, m_ncpl
275	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
276	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
277	ENDDO
278	!
279	!-- Save the current model communicator for pmc internal use
280	m_model_comm = comm
281
282	!
283	!-- Create intercommunicator between the parent and children.
284	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of different colors. The
285	!-- grouping was done above with MPI_COMM_SPLIT. A duplicate of MPI_COMM_WORLD is created and used
286	!-- as peer communicator (peer_comm) for MPI_INTERCOMM_CREATE.
287	CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr )
288	DO i = 2, m_ncpl
289	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
290	!
291	!-- Identify all children models of the current model and create inter-communicators to
292	!-- connect between the current model and its children models.
293	tag = 500 + i
294	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i), tag, m_to_child_comm(i), &
295	istat )
296	childcount = childcount + 1
297	activeparent(i) = 1
298	ELSEIF ( i == m_my_cpl_id) THEN
299	!
300	!-- Create an inter-communicator to connect between the current model and its parent model.
301	tag = 500 + i
302	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(m_couplers(i)%parent_id), tag, &
303	m_to_parent_comm, istat )
304	ENDIF
305	ENDDO
306	!
307	!-- If I am a parent, count the number of children I have. Although this loop is symmetric on all
308	!-- processes, the "activeparent" flag is true (==1) on the respective individual process only.
309	ALLOCATE( pmc_parent_for_child(childcount+1) )
310
311	childcount = 0
312	DO i = 2, m_ncpl
313	IF ( activeparent(i) == 1 ) THEN
314	childcount = childcount + 1
315	pmc_parent_for_child(childcount) = i
316	ENDIF
317	ENDDO
318	!
319	!-- Get the size of the parent model
320	IF ( m_my_cpl_id > 1 ) THEN
321	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, istat )
322	ELSE
323	!
324	!-- The root model does not have a parent
325	m_parent_remote_size = -1
326	ENDIF
327	!
328	!-- Set myid to non-zero value except for the root domain. This is a setting for the message routine
329	!-- which is called at the end of pmci_init. That routine outputs messages for myid = 0, only.
330	!-- However, myid has not been assigened so far, so that all processes of the root model would
331	!-- output a message. To avoid this, set myid to some other value except for process 0 of the root
332	!-- domain.
333	IF ( m_world_rank /= 0 ) myid = 1
334
335	END SUBROUTINE PMC_init_model
336
337
338	!--------------------------------------------------------------------------------------------------!
339	! Description:
340	! ------------
341	!> @Todo: Missing subroutine description.
342	!--------------------------------------------------------------------------------------------------!
343	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, cpl_parent_id, lower_left_x, &
344	lower_left_y, ncpl, npe_total, request_for_cpl_id )
345	!
346	!-- Provide module private variables of the pmc for PALM
347
348	USE kinds
349
350	IMPLICIT NONE
351
352	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
353
354	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
355
356	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
357	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
358	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
359	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
360	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
361
362	INTEGER :: requested_cpl_id !<
363
364	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
365	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
366
367	!
368	!-- Set the requested coupler id
369	IF ( PRESENT( request_for_cpl_id ) ) THEN
370	requested_cpl_id = request_for_cpl_id
371	!
372	!-- Check for allowed range of values
373	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
374	ELSE
375	requested_cpl_id = m_my_cpl_id
376	ENDIF
377	!
378	!-- Return the requested information
379	IF ( PRESENT( comm_world_nesting ) ) THEN
380	comm_world_nesting = m_world_comm
381	ENDIF
382	IF ( PRESENT( cpl_id ) ) THEN
383	cpl_id = requested_cpl_id
384	ENDIF
385	IF ( PRESENT( cpl_parent_id ) ) THEN
386	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
387	ENDIF
388	IF ( PRESENT( cpl_name ) ) THEN
389	cpl_name = m_couplers(requested_cpl_id)%name
390	ENDIF
391	IF ( PRESENT( ncpl ) ) THEN
392	ncpl = m_ncpl
393	ENDIF
394	IF ( PRESENT( npe_total ) ) THEN
395	npe_total = m_couplers(requested_cpl_id)%npe_total
396	ENDIF
397	IF ( PRESENT( lower_left_x ) ) THEN
398	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
399	ENDIF
400	IF ( PRESENT( lower_left_y ) ) THEN
401	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
402	ENDIF
403
404	END SUBROUTINE pmc_get_model_info
405
406
407
408	LOGICAL function pmc_is_rootmodel( )
409
410	IMPLICIT NONE
411
412	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
413
414	END FUNCTION pmc_is_rootmodel
415
416
417
418	!--------------------------------------------------------------------------------------------------!
419	! Description:
420	! ------------
421	!> @Todo: Missing subroutine description.
422	!--------------------------------------------------------------------------------------------------!
423	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
424	anterpolation_buffer_width, pmc_status )
425
426	IMPLICIT NONE
427
428	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
429	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
430
431	INTEGER, INTENT(INOUT) :: anterpolation_buffer_width !< Boundary buffer width for anterpolation
432	INTEGER(iwp), INTENT(INOUT) :: pmc_status !<
433
434	INTEGER(iwp) :: bad_llcorner !<
435	INTEGER(iwp) :: i !<
436	INTEGER(iwp) :: istat !<
437
438	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts !<
439
440	NAMELIST /nesting_parameters/ domain_layouts, &
441	nesting_datatransfer_mode, &
442	nesting_mode, &
443	anterpolation_buffer_width
444
445	!
446	!-- Initialize some coupling variables
447	domain_layouts(1:pmc_max_models)%id = -1
448	m_ncpl = 0
449
450	pmc_status = pmc_status_ok
451	!
452	!-- Open the NAMELIST-file and read the nesting layout
453	CALL check_open( 11 )
454	READ ( 11, nesting_parameters, IOSTAT = istat )
455	!
456	!-- Set filepointer to the beginning of the file. Otherwise process 0 will later be unable to read
457	!-- the inipar-NAMELIST
458	REWIND ( 11 )
459
460	IF ( istat < 0 ) THEN
461	!
462	!-- No nesting_parameters-NAMELIST found
463	pmc_status = pmc_no_namelist_found
464	RETURN
465	ELSEIF ( istat > 0 ) THEN
466	!
467	!-- Errors in reading nesting_parameters-NAMELIST
468	pmc_status = pmc_namelist_error
469	RETURN
470	ENDIF
471	!
472	!-- Output location message
473	CALL location_message( 'initialize communicators for nesting', 'start' )
474	!
475	!-- Assign the layout to the corresponding internally used variable m_couplers
476	m_couplers = domain_layouts
477	!
478	!-- Get the number of nested models given in the nesting_parameters-NAMELIST
479	DO i = 1, pmc_max_models
480	!
481	!-- When id=-1 is found for the first time, the list of domains is finished
482	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
483	IF ( m_couplers(i)%id == -1 ) THEN
484	m_ncpl = i - 1
485	EXIT
486	ELSE
487	m_ncpl = pmc_max_models
488	ENDIF
489	ENDIF
490	ENDDO
491	!
492	!-- Make sure that all domains have equal lower left corner in case of vertical nesting
493	IF ( nesting_mode == 'vertical' ) THEN
494	bad_llcorner = 0
495	DO i = 1, m_ncpl
496	IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR. &
497	domain_layouts(i)%lower_left_y /= 0.0_wp ) THEN
498	bad_llcorner = bad_llcorner + 1
499	domain_layouts(i)%lower_left_x = 0.0_wp
500	domain_layouts(i)%lower_left_y = 0.0_wp
501	ENDIF
502	ENDDO
503	IF ( bad_llcorner /= 0) THEN
504	WRITE( message_string, *) 'at least one dimension of lower ', &
505	'left corner of one domain is not 0. ', &
506	'All lower left corners were set to (0, 0)'
507	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
508	ENDIF
509	ENDIF
510
511	CALL location_message( 'initialize communicators for nesting', 'finished' )
512
513	END SUBROUTINE read_coupling_layout
514
515	#endif
516	END MODULE pmc_handle_communicator

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