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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 4640

Last change on this file since 4640 was 4629, checked in by raasch, 4 years ago
support for MPI Fortran77 interface (mpif.h) removed
Property svn:keywords set to `Id`
File size: 18.0 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 1997-2020 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: pmc_handle_communicator_mod.f90 4629 2020-07-29 09:37:56Z suehring $
27	! support for MPI Fortran77 interface (mpif.h) removed
28	!
29	! 4360 2020-01-07 11:25:50Z suehring
30	! Corrected "Former revisions" section
31	!
32	! 3888 2019-04-12 09:18:10Z hellstea
33	! Missing MPI_BCAST of anterpolation_buffer_width added.
34	!
35	! 3885 2019-04-11 11:29:34Z kanani
36	! Changes related to global restructuring of location messages and introduction
37	! of additional debug messages
38	!
39	! 3819 2019-03-27 11:01:36Z hellstea
40	! Adjustable anterpolation buffer introduced on all nest boundaries, it is controlled
41	! by the new nesting_parameters parameter anterpolation_buffer_width.
42	!
43	! 3655 2019-01-07 16:51:22Z knoop
44	! nestpar renamed to nesting_parameters
45	!
46	! 1762 2016-02-25 12:31:13Z hellstea
47	! Initial revision by K. Ketelsen
48	!
49	! Description:
50	! ------------
51	! Handle MPI communicator in PALM model coupler
52	!-------------------------------------------------------------------------------!
53	MODULE PMC_handle_communicator
54	#if defined( __parallel )
55	USE kinds
56
57	USE MPI
58
59	USE pmc_general, &
60	ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
61	USE control_parameters, &
62	ONLY: message_string
63
64	IMPLICIT NONE
65
66
67	TYPE pmc_layout
68
69	CHARACTER(LEN=32) :: name
70
71	INTEGER :: id !<
72	INTEGER :: parent_id !<
73	INTEGER :: npe_total !<
74
75	REAL(wp) :: lower_left_x !<
76	REAL(wp) :: lower_left_y !<
77
78	END TYPE pmc_layout
79
80	PUBLIC pmc_status_ok, pmc_status_error
81
82	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of processes
83	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nesting_parameters namelist
84	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
85
86	INTEGER :: m_world_comm !< global nesting communicator
87	INTEGER :: m_my_cpl_id !< coupler id of this model
88	INTEGER :: m_parent_id !< coupler id of parent of this model
89	INTEGER :: m_ncpl !< number of couplers given in nesting_parameters namelist
90
91	TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
92
93	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
94	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
95	INTEGER, PUBLIC :: m_world_rank !<
96	INTEGER :: m_world_npes !<
97	INTEGER, PUBLIC :: m_model_rank !<
98	INTEGER, PUBLIC :: m_model_npes !<
99	INTEGER :: m_parent_remote_size !< number of processes in the parent model
100	INTEGER :: peer_comm !< peer_communicator for inter communicators
101
102	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
103	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
104
105
106	INTERFACE pmc_is_rootmodel
107	MODULE PROCEDURE pmc_is_rootmodel
108	END INTERFACE pmc_is_rootmodel
109
110	INTERFACE pmc_get_model_info
111	MODULE PROCEDURE pmc_get_model_info
112	END INTERFACE pmc_get_model_info
113
114	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
115
116	CONTAINS
117
118	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
119	anterpolation_buffer_width, pmc_status )
120
121	USE control_parameters, &
122	ONLY: message_string
123
124	USE pegrid, &
125	ONLY: myid
126
127	IMPLICIT NONE
128
129	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
130	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
131
132	INTEGER, INTENT(INOUT) :: anterpolation_buffer_width !< Boundary buffer width for anterpolation
133	INTEGER, INTENT(INOUT) :: comm !<
134	INTEGER, INTENT(INOUT) :: pmc_status !<
135
136	INTEGER :: childcount !<
137	INTEGER :: i !<
138	INTEGER :: ierr !<
139	INTEGER :: istat !<
140	INTEGER :: m_my_cpl_rank !<
141	INTEGER :: tag !<
142
143	INTEGER, DIMENSION(pmc_max_models) :: activeparent ! I am active parent for this child ID
144	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe
145
146	pmc_status = pmc_status_ok
147	comm = -1
148	m_world_comm = MPI_COMM_WORLD
149	m_my_cpl_id = -1
150	childcount = 0
151	activeparent = -1
152	start_pe(:) = 0
153
154	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
155	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
156	!
157	!-- Only process 0 of root model reads
158	IF ( m_world_rank == 0 ) THEN
159
160	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
161	anterpolation_buffer_width, pmc_status )
162
163	IF ( pmc_status /= pmc_no_namelist_found .AND. &
164	pmc_status /= pmc_namelist_error ) &
165	THEN
166	!
167	!-- Calculate start PE of every model
168	start_pe(1) = 0
169	DO i = 2, m_ncpl+1
170	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
171	ENDDO
172
173	!
174	!-- The sum of numbers of processes requested by all the domains
175	!-- must be equal to the total number of processes of the run
176	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
177	WRITE ( message_string, '(2A,I6,2A,I6,A)' ) &
178	'nesting-setup requires different number of ', &
179	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
180	'provided (', m_world_npes,')'
181	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
182	ENDIF
183
184	ENDIF
185
186	ENDIF
187	!
188	!-- Broadcast the read status. This synchronises all other processes with
189	!-- process 0 of the root model. Without synchronisation, they would not
190	!-- behave in the correct way (e.g. they would not return in case of a
191	!-- missing NAMELIST).
192	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
193
194	IF ( pmc_status == pmc_no_namelist_found ) THEN
195	!
196	!-- Not a nested run; return the MPI_WORLD communicator
197	comm = MPI_COMM_WORLD
198	RETURN
199
200	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
201	!
202	!-- Only the root model gives the error message. Others are aborted by the
203	!-- message-routine with MPI_ABORT. Must be done this way since myid and
204	!-- comm2d have not yet been assigned at this point.
205	IF ( m_world_rank == 0 ) THEN
206	message_string = 'errors in \$nesting_parameters'
207	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
208	ENDIF
209
210	ENDIF
211
212	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
213	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
214	!
215	!-- Broadcast coupling layout
216	DO i = 1, m_ncpl
217	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
218	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
219	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
220	MPI_COMM_WORLD, istat )
221	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
222	MPI_COMM_WORLD, istat )
223	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
224	MPI_COMM_WORLD, istat )
225	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
226	MPI_COMM_WORLD, istat )
227	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
228	MPI_COMM_WORLD, istat )
229	ENDDO
230	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, &
231	MPI_COMM_WORLD, istat )
232	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), &
233	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
234	CALL MPI_BCAST( anterpolation_buffer_width, 1, MPI_INT, 0, MPI_COMM_WORLD, &
235	istat )
236	!
237	!-- Assign global MPI processes to individual models by setting the couple id
238	DO i = 1, m_ncpl
239	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) &
240	THEN
241	m_my_cpl_id = i
242	EXIT
243	ENDIF
244	ENDDO
245	m_my_cpl_rank = m_world_rank - start_pe(i)
246	!
247	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
248	!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
249	!-- The color of the model is represented by the coupler id
250	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, &
251	istat )
252	!
253	!-- Get size and rank of the model running on this process
254	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
255	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
256	!
257	!-- Broadcast (from process 0) the parent id and id of every model
258	DO i = 1, m_ncpl
259	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, &
260	MPI_COMM_WORLD, istat )
261	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
262	MPI_COMM_WORLD, istat )
263	ENDDO
264	!
265	!-- Save the current model communicator for pmc internal use
266	m_model_comm = comm
267
268	!
269	!-- Create intercommunicator between the parent and children.
270	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
271	!-- different colors.
272	!-- The grouping was done above with MPI_COMM_SPLIT.
273	!-- A duplicate of MPI_COMM_WORLD is created and used as peer communicator
274	!-- (peer_comm) for MPI_INTERCOMM_CREATE.
275	CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr )
276	DO i = 2, m_ncpl
277	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
278	!
279	!-- Identify all children models of the current model and create
280	!-- inter-communicators to connect between the current model and its
281	!-- children models.
282	tag = 500 + i
283	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i), &
284	tag, m_to_child_comm(i), istat)
285	childcount = childcount + 1
286	activeparent(i) = 1
287	ELSEIF ( i == m_my_cpl_id) THEN
288	!
289	!-- Create an inter-communicator to connect between the current
290	!-- model and its parent model.
291	tag = 500 + i
292	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, &
293	start_pe(m_couplers(i)%parent_id), &
294	tag, m_to_parent_comm, istat )
295	ENDIF
296	ENDDO
297	!
298	!-- If I am a parent, count the number of children I have.
299	!-- Although this loop is symmetric on all processes, the "activeparent" flag
300	!-- is true (==1) on the respective individual process only.
301	ALLOCATE( pmc_parent_for_child(childcount+1) )
302
303	childcount = 0
304	DO i = 2, m_ncpl
305	IF ( activeparent(i) == 1 ) THEN
306	childcount = childcount + 1
307	pmc_parent_for_child(childcount) = i
308	ENDIF
309	ENDDO
310	!
311	!-- Get the size of the parent model
312	IF ( m_my_cpl_id > 1 ) THEN
313	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, &
314	istat )
315	ELSE
316	!
317	!-- The root model does not have a parent
318	m_parent_remote_size = -1
319	ENDIF
320	!
321	!-- Set myid to non-zero value except for the root domain. This is a setting
322	!-- for the message routine which is called at the end of pmci_init. That
323	!-- routine outputs messages for myid = 0, only. However, myid has not been
324	!-- assigened so far, so that all processes of the root model would output a
325	!-- message. To avoid this, set myid to some other value except for process 0
326	!-- of the root domain.
327	IF ( m_world_rank /= 0 ) myid = 1
328
329	END SUBROUTINE PMC_init_model
330
331
332
333	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, &
334	cpl_parent_id, lower_left_x, lower_left_y, &
335	ncpl, npe_total, request_for_cpl_id )
336	!
337	!-- Provide module private variables of the pmc for PALM
338
339	USE kinds
340
341	IMPLICIT NONE
342
343	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
344
345	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
346
347	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
348	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
349	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
350	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
351	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
352
353	INTEGER :: requested_cpl_id !<
354
355	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
356	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
357
358	!
359	!-- Set the requested coupler id
360	IF ( PRESENT( request_for_cpl_id ) ) THEN
361	requested_cpl_id = request_for_cpl_id
362	!
363	!-- Check for allowed range of values
364	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
365	ELSE
366	requested_cpl_id = m_my_cpl_id
367	ENDIF
368	!
369	!-- Return the requested information
370	IF ( PRESENT( comm_world_nesting ) ) THEN
371	comm_world_nesting = m_world_comm
372	ENDIF
373	IF ( PRESENT( cpl_id ) ) THEN
374	cpl_id = requested_cpl_id
375	ENDIF
376	IF ( PRESENT( cpl_parent_id ) ) THEN
377	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
378	ENDIF
379	IF ( PRESENT( cpl_name ) ) THEN
380	cpl_name = m_couplers(requested_cpl_id)%name
381	ENDIF
382	IF ( PRESENT( ncpl ) ) THEN
383	ncpl = m_ncpl
384	ENDIF
385	IF ( PRESENT( npe_total ) ) THEN
386	npe_total = m_couplers(requested_cpl_id)%npe_total
387	ENDIF
388	IF ( PRESENT( lower_left_x ) ) THEN
389	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
390	ENDIF
391	IF ( PRESENT( lower_left_y ) ) THEN
392	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
393	ENDIF
394
395	END SUBROUTINE pmc_get_model_info
396
397
398
399	LOGICAL function pmc_is_rootmodel( )
400
401	IMPLICIT NONE
402
403	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
404
405	END FUNCTION pmc_is_rootmodel
406
407
408
409	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
410	anterpolation_buffer_width, pmc_status )
411
412	IMPLICIT NONE
413
414	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode
415	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode
416
417	INTEGER, INTENT(INOUT) :: anterpolation_buffer_width !< Boundary buffer width for anterpolation
418	INTEGER(iwp), INTENT(INOUT) :: pmc_status
419	INTEGER(iwp) :: bad_llcorner
420	INTEGER(iwp) :: i
421	INTEGER(iwp) :: istat
422
423	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts
424
425	NAMELIST /nesting_parameters/ domain_layouts, nesting_datatransfer_mode, &
426	nesting_mode, anterpolation_buffer_width
427
428	!
429	!-- Initialize some coupling variables
430	domain_layouts(1:pmc_max_models)%id = -1
431	m_ncpl = 0
432
433	pmc_status = pmc_status_ok
434	!
435	!-- Open the NAMELIST-file and read the nesting layout
436	CALL check_open( 11 )
437	READ ( 11, nesting_parameters, IOSTAT=istat )
438	!
439	!-- Set filepointer to the beginning of the file. Otherwise process 0 will later
440	!-- be unable to read the inipar-NAMELIST
441	REWIND ( 11 )
442
443	IF ( istat < 0 ) THEN
444	!
445	!-- No nesting_parameters-NAMELIST found
446	pmc_status = pmc_no_namelist_found
447	RETURN
448	ELSEIF ( istat > 0 ) THEN
449	!
450	!-- Errors in reading nesting_parameters-NAMELIST
451	pmc_status = pmc_namelist_error
452	RETURN
453	ENDIF
454	!
455	!-- Output location message
456	CALL location_message( 'initialize communicators for nesting', 'start' )
457	!
458	!-- Assign the layout to the corresponding internally used variable m_couplers
459	m_couplers = domain_layouts
460	!
461	!-- Get the number of nested models given in the nesting_parameters-NAMELIST
462	DO i = 1, pmc_max_models
463	!
464	!-- When id=-1 is found for the first time, the list of domains is finished
465	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
466	IF ( m_couplers(i)%id == -1 ) THEN
467	m_ncpl = i - 1
468	EXIT
469	ELSE
470	m_ncpl = pmc_max_models
471	ENDIF
472	ENDIF
473	ENDDO
474	!
475	!-- Make sure that all domains have equal lower left corner in case of vertical
476	!-- nesting
477	IF ( nesting_mode == 'vertical' ) THEN
478	bad_llcorner = 0
479	DO i = 1, m_ncpl
480	IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR. &
481	domain_layouts(i)%lower_left_y /= 0.0_wp ) THEN
482	bad_llcorner = bad_llcorner + 1
483	domain_layouts(i)%lower_left_x = 0.0_wp
484	domain_layouts(i)%lower_left_y = 0.0_wp
485	ENDIF
486	ENDDO
487	IF ( bad_llcorner /= 0) THEN
488	WRITE ( message_string, *) 'at least one dimension of lower ', &
489	'left corner of one domain is not 0. ', &
490	'All lower left corners were set to (0, 0)'
491	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
492	ENDIF
493	ENDIF
494
495	CALL location_message( 'initialize communicators for nesting', 'finished' )
496
497	END SUBROUTINE read_coupling_layout
498
499	#endif
500	END MODULE pmc_handle_communicator

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