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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 4843

Last change on this file since 4843 was 4843, checked in by raasch, 3 years ago
local namelist parameter added to switch off the module although the respective module namelist appears in the namelist file, further copyright updates
Property svn:keywords set to `Id`
File size: 21.3 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 1997-2021 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------------------------!
18	!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: pmc_handle_communicator_mod.f90 4843 2021-01-15 15:22:11Z raasch $
27	! local namelist parameter added to switch off the module although the respective module namelist
28	! appears in the namelist file
29	!
30	! 4828 2021-01-05 11:21:41Z Giersch
31	! Canopy-restricted anterpolation introduced. New namelist parameter anterpolation_starting_height
32	! introduced for controlling canopy-restricted anterpolation.
33	!
34	! 4650 2020-08-25 14:35:50Z raasch
35	! bugfix for r4649
36	!
37	! 4649 2020-08-25 12:11:17Z raasch
38	! File re-formatted to follow the PALM coding standard
39	!
40	!
41	! 4629 2020-07-29 09:37:56Z raasch
42	! Support for MPI Fortran77 interface (mpif.h) removed
43	!
44	! 4360 2020-01-07 11:25:50Z suehring
45	! Corrected "Former revisions" section
46	!
47	! 3888 2019-04-12 09:18:10Z hellstea
48	! Missing MPI_BCAST of anterpolation_buffer_width added.
49	!
50	! 3885 2019-04-11 11:29:34Z kanani
51	! Changes related to global restructuring of location messages and introduction of additional debug
52	! messages
53	!
54	! 3819 2019-03-27 11:01:36Z hellstea
55	! Adjustable anterpolation buffer introduced on all nest boundaries, it is controlled by the new
56	! nesting_parameters parameter anterpolation_buffer_width.
57	!
58	! 3655 2019-01-07 16:51:22Z knoop
59	! nestpar renamed to nesting_parameters
60	!
61	! 1762 2016-02-25 12:31:13Z hellstea
62	! Initial revision by K. Ketelsen
63	!
64	! Description:
65	! ------------
66	! Handle MPI communicator in PALM model coupler
67	!--------------------------------------------------------------------------------------------------!
68	MODULE PMC_handle_communicator
69	#if defined( __parallel )
70	USE kinds
71
72	USE MPI
73
74	USE pmc_general, &
75	ONLY: pmc_max_models, &
76	pmc_status_error, &
77	pmc_status_ok
78
79
80	USE control_parameters, &
81	ONLY: message_string
82
83	IMPLICIT NONE
84
85	!
86	!-- ATTENTION: Do not change the order of variable declarations in the following TYPE definition,
87	!-- because the order must follow the order in which the layout data is given in the NAMELIST file.
88	TYPE pmc_layout
89
90	CHARACTER(LEN=32) :: name !<
91
92	INTEGER :: id !<
93	INTEGER :: parent_id !<
94	INTEGER :: npe_total !<
95
96	REAL(wp) :: lower_left_x !<
97	REAL(wp) :: lower_left_y !<
98
99	END TYPE pmc_layout
100
101	PUBLIC pmc_status_ok, pmc_status_error !<
102
103	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of processes
104	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nesting_parameters namelist
105	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
106
107	INTEGER :: m_my_cpl_id !< coupler id of this model
108	INTEGER :: m_ncpl !< number of couplers given in nesting_parameters namelist
109	INTEGER :: m_parent_id !< coupler id of parent of this model
110	INTEGER :: m_world_comm !< global nesting communicator
111
112	TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
113
114	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
115	INTEGER, PUBLIC :: m_model_npes !<
116	INTEGER, PUBLIC :: m_model_rank !<
117	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
118	INTEGER, PUBLIC :: m_world_rank !<
119	INTEGER :: m_parent_remote_size !< number of processes in the parent model
120	INTEGER :: m_world_npes !<
121	INTEGER :: peer_comm !< peer_communicator for inter communicators
122
123	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
124	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
125
126
127	INTERFACE pmc_get_model_info
128	MODULE PROCEDURE pmc_get_model_info
129	END INTERFACE pmc_get_model_info
130
131	INTERFACE pmc_is_rootmodel
132	MODULE PROCEDURE pmc_is_rootmodel
133	END INTERFACE pmc_is_rootmodel
134
135	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel !<
136
137
138
139	CONTAINS
140
141
142	!--------------------------------------------------------------------------------------------------!
143	! Description:
144	! ------------
145	!> @Todo: Missing subroutine description.
146	!--------------------------------------------------------------------------------------------------!
147	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
148	anterpolation_buffer_width, anterpolation_starting_height, pmc_status )
149
150	USE control_parameters, &
151	ONLY: message_string
152
153	USE pegrid, &
154	ONLY: myid
155
156	IMPLICIT NONE
157
158	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
159	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
160
161	INTEGER, INTENT(INOUT) :: anterpolation_buffer_width !< Boundary buffer width for anterpolation
162	INTEGER, INTENT(INOUT) :: comm !<
163	INTEGER, INTENT(INOUT) :: pmc_status !<
164
165	REAL(wp), INTENT(INOUT) :: anterpolation_starting_height !< steering parameter for canopy restricted anterpolation
166
167	INTEGER :: childcount !<
168	INTEGER :: i !<
169	INTEGER :: ierr !<
170	INTEGER :: istat !<
171	INTEGER :: m_my_cpl_rank !<
172	INTEGER :: tag !<
173
174	INTEGER, DIMENSION(pmc_max_models) :: activeparent !< I am active parent for this child ID
175	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe !<
176
177	pmc_status = pmc_status_ok
178	comm = -1
179	m_world_comm = MPI_COMM_WORLD
180	m_my_cpl_id = -1
181	childcount = 0
182	activeparent = -1
183	start_pe(:) = 0
184
185	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
186	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
187	!
188	!-- Only process 0 of root model reads
189	IF ( m_world_rank == 0 ) THEN
190
191	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
192	anterpolation_buffer_width, anterpolation_starting_height, &
193	pmc_status )
194
195	IF ( pmc_status /= pmc_no_namelist_found .AND. &
196	pmc_status /= pmc_namelist_error ) &
197	THEN
198	!
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
204
205	!
206	!-- The sum of numbers of processes requested by all the domains must be equal to the total
207	!-- number of processes of the run
208	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
209	WRITE( message_string, '(2A,I6,2A,I6,A)' ) &
210	'nesting-setup requires different number of ', &
211	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
212	'provided (', m_world_npes,')'
213	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
214	ENDIF
215
216	ENDIF
217
218	ENDIF
219	!
220	!-- Broadcast the read status. This synchronises all other processes with process 0 of the root
221	!-- model. Without synchronisation, they would not behave in the correct way (e.g. they would not
222	!-- return in case of a missing NAMELIST).
223	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
224
225	IF ( pmc_status == pmc_no_namelist_found ) THEN
226	!
227	!-- Not a nested run; return the MPI_WORLD communicator
228	comm = MPI_COMM_WORLD
229	RETURN
230
231	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
232	!
233	!-- Only the root model gives the error message. Others are aborted by the message-routine with
234	!-- MPI_ABORT. Must be done this way since myid and comm2d have not yet been assigned at this
235	!-- point.
236	IF ( m_world_rank == 0 ) THEN
237	message_string = 'errors in \$nesting_parameters'
238	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
239	ENDIF
240
241	ENDIF
242
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 )
245	!
246	!-- Broadcast coupling layout
247	DO i = 1, m_ncpl
248	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
249	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
250	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
251	MPI_COMM_WORLD, istat )
252	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
253	MPI_COMM_WORLD, istat )
254	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
255	MPI_COMM_WORLD, istat )
256	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
257	MPI_COMM_WORLD, istat )
258	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
259	MPI_COMM_WORLD, istat )
260	ENDDO
261	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
262	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), MPI_CHARACTER, 0, &
263	MPI_COMM_WORLD, istat )
264	CALL MPI_BCAST( anterpolation_buffer_width, 1, MPI_INT, 0, MPI_COMM_WORLD, istat )
265	CALL MPI_BCAST( anterpolation_starting_height, 1, MPI_REAL, 0, MPI_COMM_WORLD, istat )
266	!
267	!-- Assign global MPI processes to individual models by setting the couple id
268	DO i = 1, m_ncpl
269	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) THEN
270	m_my_cpl_id = i
271	EXIT
272	ENDIF
273	ENDDO
274	m_my_cpl_rank = m_world_rank - start_pe(i)
275	!
276	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach). The communictors for the
277	!-- individual models as created by MPI_COMM_SPLIT. The color of the model is represented by the
278	!-- coupler id
279	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, istat )
280	!
281	!-- Get size and rank of the model running on this process
282	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
283	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
284	!
285	!-- Broadcast (from process 0) the parent id and id of every model
286	DO i = 1, m_ncpl
287	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
288	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
289	ENDDO
290	!
291	!-- Save the current model communicator for pmc internal use
292	m_model_comm = comm
293
294	!
295	!-- Create intercommunicator between the parent and children.
296	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of different colors. The
297	!-- grouping was done above with MPI_COMM_SPLIT. A duplicate of MPI_COMM_WORLD is created and used
298	!-- as peer communicator (peer_comm) for MPI_INTERCOMM_CREATE.
299	CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr )
300	DO i = 2, m_ncpl
301	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
302	!
303	!-- Identify all children models of the current model and create inter-communicators to
304	!-- connect between the current model and its children models.
305	tag = 500 + i
306	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i), tag, m_to_child_comm(i), &
307	istat )
308	childcount = childcount + 1
309	activeparent(i) = 1
310	ELSEIF ( i == m_my_cpl_id) THEN
311	!
312	!-- Create an inter-communicator to connect between the current model and its parent model.
313	tag = 500 + i
314	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(m_couplers(i)%parent_id), tag, &
315	m_to_parent_comm, istat )
316	ENDIF
317	ENDDO
318	!
319	!-- If I am a parent, count the number of children I have. Although this loop is symmetric on all
320	!-- processes, the "activeparent" flag is true (==1) on the respective individual process only.
321	ALLOCATE( pmc_parent_for_child(childcount+1) )
322
323	childcount = 0
324	DO i = 2, m_ncpl
325	IF ( activeparent(i) == 1 ) THEN
326	childcount = childcount + 1
327	pmc_parent_for_child(childcount) = i
328	ENDIF
329	ENDDO
330	!
331	!-- Get the size of the parent model
332	IF ( m_my_cpl_id > 1 ) THEN
333	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, istat )
334	ELSE
335	!
336	!-- The root model does not have a parent
337	m_parent_remote_size = -1
338	ENDIF
339	!
340	!-- Set myid to non-zero value except for the root domain. This is a setting for the message routine
341	!-- which is called at the end of pmci_init. That routine outputs messages for myid = 0, only.
342	!-- However, myid has not been assigened so far, so that all processes of the root model would
343	!-- output a message. To avoid this, set myid to some other value except for process 0 of the root
344	!-- domain.
345	IF ( m_world_rank /= 0 ) myid = 1
346
347	END SUBROUTINE PMC_init_model
348
349
350	!--------------------------------------------------------------------------------------------------!
351	! Description:
352	! ------------
353	!> @Todo: Missing subroutine description.
354	!--------------------------------------------------------------------------------------------------!
355	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, cpl_parent_id, lower_left_x, &
356	lower_left_y, ncpl, npe_total, request_for_cpl_id )
357	!
358	!-- Provide module private variables of the pmc for PALM
359
360	USE kinds
361
362	IMPLICIT NONE
363
364	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
365
366	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
367
368	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
369	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
370	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
371	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
372	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
373
374	INTEGER :: requested_cpl_id !<
375
376	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
377	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
378
379	!
380	!-- Set the requested coupler id
381	IF ( PRESENT( request_for_cpl_id ) ) THEN
382	requested_cpl_id = request_for_cpl_id
383	!
384	!-- Check for allowed range of values
385	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
386	ELSE
387	requested_cpl_id = m_my_cpl_id
388	ENDIF
389	!
390	!-- Return the requested information
391	IF ( PRESENT( comm_world_nesting ) ) THEN
392	comm_world_nesting = m_world_comm
393	ENDIF
394	IF ( PRESENT( cpl_id ) ) THEN
395	cpl_id = requested_cpl_id
396	ENDIF
397	IF ( PRESENT( cpl_parent_id ) ) THEN
398	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
399	ENDIF
400	IF ( PRESENT( cpl_name ) ) THEN
401	cpl_name = m_couplers(requested_cpl_id)%name
402	ENDIF
403	IF ( PRESENT( ncpl ) ) THEN
404	ncpl = m_ncpl
405	ENDIF
406	IF ( PRESENT( npe_total ) ) THEN
407	npe_total = m_couplers(requested_cpl_id)%npe_total
408	ENDIF
409	IF ( PRESENT( lower_left_x ) ) THEN
410	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
411	ENDIF
412	IF ( PRESENT( lower_left_y ) ) THEN
413	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
414	ENDIF
415
416	END SUBROUTINE pmc_get_model_info
417
418
419
420	LOGICAL function pmc_is_rootmodel( )
421
422	IMPLICIT NONE
423
424	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
425
426	END FUNCTION pmc_is_rootmodel
427
428
429
430	!--------------------------------------------------------------------------------------------------!
431	! Description:
432	! ------------
433	!> @Todo: Missing subroutine description.
434	!--------------------------------------------------------------------------------------------------!
435	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
436	anterpolation_buffer_width, anterpolation_starting_height, &
437	pmc_status )
438
439	IMPLICIT NONE
440
441	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
442	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
443
444	INTEGER, INTENT(INOUT) :: anterpolation_buffer_width !< Boundary buffer width for anterpolation
445	INTEGER(iwp), INTENT(INOUT) :: pmc_status !<
446
447	REAL(wp), INTENT(INOUT) :: anterpolation_starting_height !< steering parameter for canopy restricted anterpolation
448
449	INTEGER(iwp) :: bad_llcorner !<
450	INTEGER(iwp) :: i !<
451	INTEGER(iwp) :: io_status !<
452
453	LOGICAL :: switch_off_module = .FALSE. !< local namelist parameter to switch off the module
454	!< although the respective module namelist appears in
455	!< the namelist file
456
457	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts !<
458
459	NAMELIST /nesting_parameters/ anterpolation_buffer_width, &
460	anterpolation_starting_height, &
461	domain_layouts, &
462	nesting_datatransfer_mode, &
463	nesting_mode, &
464	switch_off_module
465
466
467	!
468	!-- Initialize some coupling variables
469	domain_layouts(1:pmc_max_models)%id = -1
470	m_ncpl = 0
471
472	pmc_status = pmc_no_namelist_found
473	!
474	!-- Open the NAMELIST-file and read the nesting layout
475	CALL check_open( 11 )
476	READ ( 11, nesting_parameters, IOSTAT = io_status )
477	!
478	!-- Set filepointer to the beginning of the file. Otherwise process 0 will later be unable to read
479	!-- the inipar-NAMELIST
480	REWIND ( 11 )
481
482	IF ( io_status == 0 ) THEN
483	!
484	!-- nesting_parameters namelist was found and read correctly. Enable the nesting by setting
485	!-- the palm model coupler status respectively.
486	IF ( .NOT. switch_off_module ) THEN
487	pmc_status = pmc_status_ok
488	ELSE
489	RETURN
490	ENDIF
491	ELSEIF ( io_status < 0 ) THEN
492	!
493	!-- No nesting_parameters-NAMELIST found
494	RETURN
495	ELSEIF ( io_status > 0 ) THEN
496	!
497	!-- Errors in reading nesting_parameters-NAMELIST
498	pmc_status = pmc_namelist_error
499	RETURN
500	ENDIF
501
502	!
503	!-- Output location message
504	CALL location_message( 'initialize communicators for nesting', 'start' )
505	!
506	!-- Assign the layout to the corresponding internally used variable m_couplers
507	m_couplers = domain_layouts
508	!
509	!-- Get the number of nested models given in the nesting_parameters-NAMELIST
510	DO i = 1, pmc_max_models
511	!
512	!-- When id=-1 is found for the first time, the list of domains is finished
513	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
514	IF ( m_couplers(i)%id == -1 ) THEN
515	m_ncpl = i - 1
516	EXIT
517	ELSE
518	m_ncpl = pmc_max_models
519	ENDIF
520	ENDIF
521	ENDDO
522	!
523	!-- Make sure that all domains have equal lower left corner in case of vertical 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
535	WRITE( message_string, *) 'at least one dimension of lower ', &
536	'left corner of one domain is not 0. ', &
537	'All lower left corners were set to (0, 0)'
538	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
539	ENDIF
540	ENDIF
541
542	CALL location_message( 'initialize communicators for nesting', 'finished' )
543
544	END SUBROUTINE read_coupling_layout
545
546	#endif
547	END MODULE pmc_handle_communicator

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