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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 2481

Last change on this file since 2481 was 2280, checked in by suehring, 7 years ago
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1	MODULE PMC_handle_communicator
2
3	!------------------------------------------------------------------------------!
4	! This file is part of PALM.
5	!
6	! PALM is free software: you can redistribute it and/or modify it under the
7	! terms of the GNU General Public License as published by the Free Software
8	! Foundation, either version 3 of the License, or (at your option) any later
9	! version.
10	!
11	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
12	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14	!
15	! You should have received a copy of the GNU General Public License along with
16	! PALM. If not, see <http://www.gnu.org/licenses/>.
17	!
18	! Copyright 1997-2017 Leibniz Universitaet Hannover
19	!------------------------------------------------------------------------------!
20	!
21	! Current revisions:
22	! ------------------
23	!
24	!
25	! Former revisions:
26	! -----------------
27	! $Id: pmc_handle_communicator_mod.f90 2280 2017-06-12 15:24:42Z raasch $
28	! Bugfix, set filepointer to the beginning of the file after namelist read,
29	! in order to assure that further namelists are also found.
30	!
31	! 2279 2017-06-12 15:23:44Z suehring
32	! Error message text changed
33	!
34	! 2101 2017-01-05 16:42:31Z suehring
35	!
36	! 2013 2016-09-21 13:07:56Z suehring
37	! Bugfix in format descriptor
38	!
39	! 2000 2016-08-20 18:09:15Z knoop
40	! Forced header and separation lines into 80 columns
41	!
42	! 1938 2016-06-13 15:26:05Z hellstea
43	! Minor clean-up.
44	!
45	! 1901 2016-05-04 15:39:38Z raasch
46	! Initial version of purely vertical nesting introduced.
47	! Code clean up. The words server/client changed to parent/child.
48	!
49	! 1900 2016-05-04 15:27:53Z raasch
50	! re-formatting to match PALM style
51	!
52	! 1882 2016-04-20 15:24:46Z hellstea
53	! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
54	! are moved out from the DO i = 1, m_ncpl loop.
55	!
56	! 1850 2016-04-08 13:29:27Z maronga
57	! Module renamed
58	!
59	! 1808 2016-04-05 19:44:00Z raasch
60	! MPI module used by default on all machines
61	!
62	! 1797 2016-03-21 16:50:28Z raasch
63	! introduction of different datatransfer modes,
64	! export of comm_world_nesting
65	!
66	! 1791 2016-03-11 10:41:25Z raasch
67	! m_nrofcpl renamed m_ncpl,
68	! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
69	! renamed and some added,
70	! debug write-statements commented out
71	!
72	! 1786 2016-03-08 05:49:27Z raasch
73	! Bugfix: nesting_mode is broadcast now
74	!
75	! 1779 2016-03-03 08:01:28Z raasch
76	! only the total number of PEs is given in the nestpar-NAMELIST,
77	! additional comments included
78	!
79	! 1764 2016-02-28 12:45:19Z raasch
80	! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
81	! the beginning of the variable list,
82	! domain layout is read with new NAMELIST nestpar from standard file PARIN,
83	! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
84	! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
85	! general format changed to PALM style
86	!
87	! 1762 2016-02-25 12:31:13Z hellstea
88	! Initial revision by K. Ketelsen
89	!
90	! Description:
91	! ------------
92	! Handle MPI communicator in PALM model coupler
93	!-------------------------------------------------------------------------------!
94
95	#if defined( __parallel )
96	USE kinds
97
98	#if defined( __mpifh )
99	INCLUDE "mpif.h"
100	#else
101	USE MPI
102	#endif
103
104	USE pmc_general, &
105	ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
106	USE control_parameters, &
107	ONLY: message_string
108
109	IMPLICIT NONE
110
111	TYPE pmc_layout
112
113	CHARACTER(LEN=32) :: name
114
115	INTEGER :: id !<
116	INTEGER :: parent_id !<
117	INTEGER :: npe_total !<
118
119	REAL(wp) :: lower_left_x !<
120	REAL(wp) :: lower_left_y !<
121
122	END TYPE pmc_layout
123
124	PUBLIC pmc_status_ok, pmc_status_error
125
126	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of PEs
127	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nestpar namelist
128	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
129
130	INTEGER :: m_world_comm !< global nesting communicator
131	INTEGER :: m_my_cpl_id !< coupler id of this modelfortran return
132	INTEGER :: m_parent_id !< coupler id of parent of this model
133	INTEGER :: m_ncpl !< number of couplers given in nestpar namelist
134
135	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
136
137	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
138	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
139	INTEGER, PUBLIC :: m_world_rank !<
140	INTEGER :: m_world_npes !<
141	INTEGER, PUBLIC :: m_model_rank !<
142	INTEGER, PUBLIC :: m_model_npes !<
143	INTEGER :: m_parent_remote_size !< number of parent PEs
144
145	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
146	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
147
148
149	INTERFACE pmc_is_rootmodel
150	MODULE PROCEDURE pmc_is_rootmodel
151	END INTERFACE pmc_is_rootmodel
152
153	INTERFACE pmc_get_model_info
154	MODULE PROCEDURE pmc_get_model_info
155	END INTERFACE pmc_get_model_info
156
157	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
158
159	CONTAINS
160
161	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
162	pmc_status )
163
164	USE control_parameters, &
165	ONLY: message_string
166
167	USE pegrid, &
168	ONLY: myid
169
170	IMPLICIT NONE
171
172	CHARACTER(LEN=8), INTENT(OUT) :: nesting_mode !<
173	CHARACTER(LEN=7), INTENT(OUT) :: nesting_datatransfer_mode !<
174
175	INTEGER, INTENT(OUT) :: comm !<
176	INTEGER, INTENT(OUT) :: pmc_status !<
177
178	INTEGER :: childcount !<
179	INTEGER :: i !<
180	INTEGER :: ierr !<
181	INTEGER :: istat !<
182	INTEGER :: m_my_cpl_rank !<
183	INTEGER :: tag !<
184
185	INTEGER, DIMENSION(pmc_max_models) :: activeparent ! I am active parent for this child ID
186	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe
187
188	pmc_status = pmc_status_ok
189	comm = -1
190	m_world_comm = MPI_COMM_WORLD
191	m_my_cpl_id = -1
192	childcount = 0
193	activeparent = -1
194	start_pe(:) = 0
195
196	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
197	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
198	!
199	!-- Only PE 0 of root model reads
200	IF ( m_world_rank == 0 ) THEN
201
202	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
203	pmc_status )
204
205	IF ( pmc_status /= pmc_no_namelist_found .AND. &
206	pmc_status /= pmc_namelist_error ) &
207	THEN
208	!
209	!-- Calculate start PE of every model
210	start_pe(1) = 0
211	DO i = 2, m_ncpl+1
212	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
213	ENDDO
214
215	!
216	!-- The number of cores provided with the run must be the same as the
217	!-- total sum of cores required by all nest domains
218	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
219	WRITE ( message_string, '(2A,I6,2A,I6,A)' ) &
220	'nesting-setup requires different number of ', &
221	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
222	'provided (', m_world_npes,')'
223	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
224	ENDIF
225
226	ENDIF
227
228	ENDIF
229	!
230	!-- Broadcast the read status. This synchronises all other PEs with PE 0 of
231	!-- the root model. Without synchronisation, they would not behave in the
232	!-- correct way (e.g. they would not return in case of a missing NAMELIST)
233	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
234
235	IF ( pmc_status == pmc_no_namelist_found ) THEN
236	!
237	!-- Not a nested run; return the MPI_WORLD communicator
238	comm = MPI_COMM_WORLD
239	RETURN
240
241	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
242	!
243	!-- Only the root model gives the error message. Others are aborted by the
244	!-- message-routine with MPI_ABORT. Must be done this way since myid and
245	!-- comm2d have not yet been assigned at this point.
246	IF ( m_world_rank == 0 ) THEN
247	message_string = 'errors in \$nestpar'
248	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
249	ENDIF
250
251	ENDIF
252
253	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
254	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
255
256	!
257	!-- Broadcast coupling layout
258	DO i = 1, m_ncpl
259	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
260	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
261	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
262	MPI_COMM_WORLD, istat )
263	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
264	MPI_COMM_WORLD, istat )
265	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
266	MPI_COMM_WORLD, istat )
267	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
268	MPI_COMM_WORLD, istat )
269	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
270	MPI_COMM_WORLD, istat )
271	ENDDO
272	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, &
273	MPI_COMM_WORLD, istat )
274	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), &
275	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
276
277	!
278	!-- Assign global MPI processes to individual models by setting the couple id
279	DO i = 1, m_ncpl
280	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) &
281	THEN
282	m_my_cpl_id = i
283	EXIT
284	ENDIF
285	ENDDO
286	m_my_cpl_rank = m_world_rank - start_pe(i)
287
288	!
289	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
290	!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
291	!-- The color of the model is represented by the coupler id
292	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, &
293	istat )
294	!
295	!-- Get size and rank of the model running on this PE
296	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
297	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
298
299	!
300	!-- Broadcast (from PE 0) the parent id and id of every model
301	DO i = 1, m_ncpl
302	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, &
303	MPI_COMM_WORLD, istat )
304	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
305	MPI_COMM_WORLD, istat )
306	ENDDO
307
308	!
309	!-- Save the current model communicator for pmc internal use
310	m_model_comm = comm
311
312	!
313	!-- Create intercommunicator between parent and children.
314	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
315	!-- different colors.
316	!-- The grouping was done above with MPI_COMM_SPLIT
317	DO i = 2, m_ncpl
318
319	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
320	!
321	!-- Collect parent PEs.
322	!-- Every model exept the root model has a parent model which acts as
323	!-- parent model. Create an intercommunicator to connect current PE to
324	!-- all children PEs
325	tag = 500 + i
326	CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD, start_pe(i), &
327	tag, m_to_child_comm(i), istat)
328	childcount = childcount + 1
329	activeparent(i) = 1
330
331	ELSEIF ( i == m_my_cpl_id) THEN
332	!
333	!-- Collect children PEs.
334	!-- Every model except the root model has a parent model.
335	!-- Create an intercommunicator to connect current PE to all parent PEs
336	tag = 500 + i
337	CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD, &
338	start_pe(m_couplers(i)%parent_id), &
339	tag, m_to_parent_comm, istat )
340	ENDIF
341
342	ENDDO
343
344	!
345	!-- If I am parent, count the number of children that I have
346	!-- Although this loop is symmetric on all processes, the "activeparent" flag
347	!-- is true (==1) on the respective individual PE only.
348	ALLOCATE( pmc_parent_for_child(childcount+1) )
349
350	childcount = 0
351	DO i = 2, m_ncpl
352	IF ( activeparent(i) == 1 ) THEN
353	childcount = childcount + 1
354	pmc_parent_for_child(childcount) = i
355	ENDIF
356	ENDDO
357	!
358	!-- Get the size of the parent model
359	IF ( m_my_cpl_id > 1 ) THEN
360	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, &
361	istat)
362	ELSE
363	!
364	!-- The root model does not have a parent
365	m_parent_remote_size = -1
366	ENDIF
367	!
368	!-- Set myid to non-tero value except for the root domain. This is a setting
369	!-- for the message routine which is called at the end of pmci_init. That
370	!-- routine outputs messages for myid = 0, only. However, myid has not been
371	!-- assigened so far, so that all PEs of the root model would output a
372	!-- message. To avoid this, set myid to some other value except for PE0 of the
373	!-- root domain.
374	IF ( m_world_rank /= 0 ) myid = 1
375
376	END SUBROUTINE PMC_init_model
377
378
379
380	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, &
381	cpl_parent_id, lower_left_x, lower_left_y, &
382	ncpl, npe_total, request_for_cpl_id )
383	!
384	!-- Provide module private variables of the pmc for PALM
385
386	USE kinds
387
388	IMPLICIT NONE
389
390	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
391
392	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
393
394	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
395	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
396	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
397	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
398	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
399
400	INTEGER :: requested_cpl_id !<
401
402	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
403	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
404
405	!
406	!-- Set the requested coupler id
407	IF ( PRESENT( request_for_cpl_id ) ) THEN
408	requested_cpl_id = request_for_cpl_id
409	!
410	!-- Check for allowed range of values
411	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
412	ELSE
413	requested_cpl_id = m_my_cpl_id
414	ENDIF
415
416	!
417	!-- Return the requested information
418	IF ( PRESENT( comm_world_nesting ) ) THEN
419	comm_world_nesting = m_world_comm
420	ENDIF
421	IF ( PRESENT( cpl_id ) ) THEN
422	cpl_id = requested_cpl_id
423	ENDIF
424	IF ( PRESENT( cpl_parent_id ) ) THEN
425	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
426	ENDIF
427	IF ( PRESENT( cpl_name ) ) THEN
428	cpl_name = m_couplers(requested_cpl_id)%name
429	ENDIF
430	IF ( PRESENT( ncpl ) ) THEN
431	ncpl = m_ncpl
432	ENDIF
433	IF ( PRESENT( npe_total ) ) THEN
434	npe_total = m_couplers(requested_cpl_id)%npe_total
435	ENDIF
436	IF ( PRESENT( lower_left_x ) ) THEN
437	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
438	ENDIF
439	IF ( PRESENT( lower_left_y ) ) THEN
440	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
441	ENDIF
442
443	END SUBROUTINE pmc_get_model_info
444
445
446
447	LOGICAL function pmc_is_rootmodel( )
448
449	IMPLICIT NONE
450
451	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
452
453	END FUNCTION pmc_is_rootmodel
454
455
456
457	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
458	pmc_status )
459
460	IMPLICIT NONE
461
462	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode
463	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode
464
465	INTEGER(iwp), INTENT(INOUT) :: pmc_status
466	INTEGER(iwp) :: bad_llcorner
467	INTEGER(iwp) :: i
468	INTEGER(iwp) :: istat
469
470	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts
471
472	NAMELIST /nestpar/ domain_layouts, nesting_datatransfer_mode, nesting_mode
473
474	!
475	!-- Initialize some coupling variables
476	domain_layouts(1:pmc_max_models)%id = -1
477	m_ncpl = 0
478
479	pmc_status = pmc_status_ok
480
481	!
482	!-- Open the NAMELIST-file and read the nesting layout
483	CALL check_open( 11 )
484	READ ( 11, nestpar, IOSTAT=istat )
485	!
486	!-- Set filepointer to the beginning of the file. Otherwise PE0 will later
487	!-- be unable to read the inipar-NAMELIST
488	REWIND ( 11 )
489
490	IF ( istat < 0 ) THEN
491
492	!
493	!-- No nestpar-NAMELIST found
494	pmc_status = pmc_no_namelist_found
495
496	RETURN
497
498	ELSEIF ( istat > 0 ) THEN
499
500	!
501	!-- Errors in reading nestpar-NAMELIST
502	pmc_status = pmc_namelist_error
503	RETURN
504
505	ENDIF
506
507	!
508	!-- Output location message
509	CALL location_message( 'initialize communicators for nesting', .FALSE. )
510
511	!
512	!-- Assign the layout to the internally used variable
513	m_couplers = domain_layouts
514
515	!
516	!-- Get the number of nested models given in the nestpar-NAMELIST
517	DO i = 1, pmc_max_models
518	!
519	!-- When id=-1 is found for the first time, the list of domains is finished
520	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
521	IF ( m_couplers(i)%id == -1 ) THEN
522	m_ncpl = i - 1
523	EXIT
524	ELSE
525	m_ncpl = pmc_max_models
526	ENDIF
527	ENDIF
528
529	ENDDO
530
531	!
532	!-- Make sure that all domains have equal lower left corner in case of vertical
533	!-- nesting
534	IF ( nesting_mode == 'vertical' ) THEN
535	bad_llcorner = 0
536	DO i = 1, m_ncpl
537	IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR. &
538	domain_layouts(i)%lower_left_y /= 0.0_wp ) THEN
539	bad_llcorner = bad_llcorner + 1
540	domain_layouts(i)%lower_left_x = 0.0_wp
541	domain_layouts(i)%lower_left_y = 0.0_wp
542	ENDIF
543	ENDDO
544	IF ( bad_llcorner /= 0) THEN
545	WRITE ( message_string, *) 'at least one dimension of lower ', &
546	'left corner of one domain is not 0. ', &
547	'All lower left corners were set to (0, 0)'
548	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
549	ENDIF
550	ENDIF
551
552	END SUBROUTINE read_coupling_layout
553
554	#endif
555	END MODULE pmc_handle_communicator

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