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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 1988

Last change on this file since 1988 was 1939, checked in by hellstea, 8 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 terms
7	! of the GNU General Public License as published by the Free Software Foundation,
8	! either version 3 of the License, or (at your option) any later 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 1997-2016 Leibniz Universitaet Hannover
18	!-------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: pmc_handle_communicator_mod.f90 1939 2016-06-13 15:26:42Z gronemeier $
27	!
28	! 1938 2016-06-13 15:26:05Z hellstea
29	! Minor clean-up.
30	!
31	! 1901 2016-05-04 15:39:38Z raasch
32	! Initial version of purely vertical nesting introduced.
33	! Code clean up. The words server/client changed to parent/child.
34	!
35	! 1900 2016-05-04 15:27:53Z raasch
36	! re-formatting to match PALM style
37	!
38	! 1882 2016-04-20 15:24:46Z hellstea
39	! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
40	! are moved out from the DO i = 1, m_ncpl loop.
41	!
42	! 1850 2016-04-08 13:29:27Z maronga
43	! Module renamed
44	!
45	! 1808 2016-04-05 19:44:00Z raasch
46	! MPI module used by default on all machines
47	!
48	! 1797 2016-03-21 16:50:28Z raasch
49	! introduction of different datatransfer modes,
50	! export of comm_world_nesting
51	!
52	! 1791 2016-03-11 10:41:25Z raasch
53	! m_nrofcpl renamed m_ncpl,
54	! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
55	! renamed and some added,
56	! debug write-statements commented out
57	!
58	! 1786 2016-03-08 05:49:27Z raasch
59	! Bugfix: nesting_mode is broadcast now
60	!
61	! 1779 2016-03-03 08:01:28Z raasch
62	! only the total number of PEs is given in the nestpar-NAMELIST,
63	! additional comments included
64	!
65	! 1764 2016-02-28 12:45:19Z raasch
66	! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
67	! the beginning of the variable list,
68	! domain layout is read with new NAMELIST nestpar from standard file PARIN,
69	! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
70	! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
71	! general format changed to PALM style
72	!
73	! 1762 2016-02-25 12:31:13Z hellstea
74	! Initial revision by K. Ketelsen
75	!
76	! Description:
77	! ------------
78	! Handle MPI communicator in PALM model coupler
79	!-------------------------------------------------------------------------------!
80
81	#if defined( __parallel )
82	USE kinds
83
84	#if defined( __mpifh )
85	INCLUDE "mpif.h"
86	#else
87	USE MPI
88	#endif
89
90	USE pmc_general, &
91	ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
92	USE control_parameters, &
93	ONLY: message_string
94
95	IMPLICIT NONE
96
97	TYPE pmc_layout
98
99	CHARACTER(LEN=32) :: name
100
101	INTEGER :: id !<
102	INTEGER :: parent_id !<
103	INTEGER :: npe_total !<
104
105	REAL(wp) :: lower_left_x !<
106	REAL(wp) :: lower_left_y !<
107
108	END TYPE pmc_layout
109
110	PUBLIC pmc_status_ok, pmc_status_error
111
112	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of PEs
113	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nestpar namelist
114	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
115
116	INTEGER :: m_world_comm !< global nesting communicator
117	INTEGER :: m_my_cpl_id !< coupler id of this model
118	INTEGER :: m_parent_id !< coupler id of parent of this model
119	INTEGER :: m_ncpl !< number of couplers given in nestpar namelist
120
121	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
122
123	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
124	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
125	INTEGER, PUBLIC :: m_world_rank !<
126	INTEGER :: m_world_npes !<
127	INTEGER, PUBLIC :: m_model_rank !<
128	INTEGER, PUBLIC :: m_model_npes !<
129	INTEGER :: m_parent_remote_size !< number of parent PEs
130
131	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
132	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
133
134
135	INTERFACE pmc_is_rootmodel
136	MODULE PROCEDURE pmc_is_rootmodel
137	END INTERFACE pmc_is_rootmodel
138
139	INTERFACE pmc_get_model_info
140	MODULE PROCEDURE pmc_get_model_info
141	END INTERFACE pmc_get_model_info
142
143	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
144
145	CONTAINS
146
147	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
148	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=8), INTENT(OUT) :: nesting_mode !<
159	CHARACTER(LEN=7), INTENT(OUT) :: nesting_datatransfer_mode !<
160
161	INTEGER, INTENT(OUT) :: comm !<
162	INTEGER, INTENT(OUT) :: pmc_status !<
163
164	INTEGER :: childcount !<
165	INTEGER :: i !<
166	INTEGER :: ierr !<
167	INTEGER :: istat !<
168	INTEGER :: m_my_cpl_rank !<
169	INTEGER :: tag !<
170
171	INTEGER, DIMENSION(pmc_max_models) :: activeparent ! I am active parent for this child ID
172	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe
173
174	pmc_status = pmc_status_ok
175	comm = -1
176	m_world_comm = MPI_COMM_WORLD
177	m_my_cpl_id = -1
178	childcount = 0
179	activeparent = -1
180	start_pe(:) = 0
181
182	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
183	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
184	!
185	!-- Only PE 0 of root model reads
186	IF ( m_world_rank == 0 ) THEN
187
188	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
189	pmc_status )
190
191	IF ( pmc_status /= pmc_no_namelist_found .AND. &
192	pmc_status /= pmc_namelist_error ) &
193	THEN
194	!
195	!-- Calculate start PE of every model
196	start_pe(1) = 0
197	DO i = 2, m_ncpl+1
198	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
199	ENDDO
200
201	!
202	!-- The number of cores provided with the run must be the same as the
203	!-- total sum of cores required by all nest domains
204	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
205	WRITE ( message_string, '(A,I6,A,I6,A)' ) &
206	'nesting-setup requires different number of ', &
207	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
208	'provided (', m_world_npes,')'
209	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
210	ENDIF
211
212	ENDIF
213
214	ENDIF
215	!
216	!-- Broadcast the read status. This synchronises all other PEs with PE 0 of
217	!-- the root model. Without synchronisation, they would not behave in the
218	!-- correct way (e.g. they would not return in case of a missing NAMELIST)
219	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
220
221	IF ( pmc_status == pmc_no_namelist_found ) THEN
222	!
223	!-- Not a nested run; return the MPI_WORLD communicator
224	comm = MPI_COMM_WORLD
225	RETURN
226
227	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
228	!
229	!-- Only the root model gives the error message. Others are aborted by the
230	!-- message-routine with MPI_ABORT. Must be done this way since myid and
231	!-- comm2d have not yet been assigned at this point.
232	IF ( m_world_rank == 0 ) THEN
233	message_string = 'errors in \$nestpar'
234	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
235	ENDIF
236
237	ENDIF
238
239	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
240	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
241
242	!
243	!-- Broadcast coupling layout
244	DO i = 1, m_ncpl
245	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
246	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
247	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
248	MPI_COMM_WORLD, istat )
249	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
250	MPI_COMM_WORLD, istat )
251	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
252	MPI_COMM_WORLD, istat )
253	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
254	MPI_COMM_WORLD, istat )
255	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
256	MPI_COMM_WORLD, istat )
257	ENDDO
258	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, &
259	MPI_COMM_WORLD, istat )
260	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), &
261	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
262
263	!
264	!-- Assign global MPI processes to individual models by setting the couple id
265	DO i = 1, m_ncpl
266	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) &
267	THEN
268	m_my_cpl_id = i
269	EXIT
270	ENDIF
271	ENDDO
272	m_my_cpl_rank = m_world_rank - start_pe(i)
273
274	!
275	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
276	!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
277	!-- The color of the model is represented by the coupler id
278	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, &
279	istat )
280	!
281	!-- Get size and rank of the model running on this PE
282	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
283	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
284
285	!
286	!-- Broadcast (from PE 0) the parent id and id of every model
287	DO i = 1, m_ncpl
288	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, &
289	MPI_COMM_WORLD, istat )
290	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
291	MPI_COMM_WORLD, istat )
292	ENDDO
293
294	!
295	!-- Save the current model communicator for pmc internal use
296	m_model_comm = comm
297
298	!
299	!-- Create intercommunicator between parent and children.
300	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
301	!-- different colors.
302	!-- The grouping was done above with MPI_COMM_SPLIT
303	DO i = 2, m_ncpl
304
305	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
306	!
307	!-- Collect parent PEs.
308	!-- Every model exept the root model has a parent model which acts as
309	!-- parent model. Create an intercommunicator to connect current PE to
310	!-- all children PEs
311	tag = 500 + i
312	CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD, start_pe(i), &
313	tag, m_to_child_comm(i), istat)
314	childcount = childcount + 1
315	activeparent(i) = 1
316
317	ELSEIF ( i == m_my_cpl_id) THEN
318	!
319	!-- Collect children PEs.
320	!-- Every model except the root model has a parent model.
321	!-- Create an intercommunicator to connect current PE to all parent PEs
322	tag = 500 + i
323	CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD, &
324	start_pe(m_couplers(i)%parent_id), &
325	tag, m_to_parent_comm, istat )
326	ENDIF
327
328	ENDDO
329
330	!
331	!-- If I am parent, count the number of children that I have
332	!-- Although this loop is symmetric on all processes, the "activeparent" flag
333	!-- is true (==1) on the respective individual PE only.
334	ALLOCATE( pmc_parent_for_child(childcount+1) )
335
336	childcount = 0
337	DO i = 2, m_ncpl
338	IF ( activeparent(i) == 1 ) THEN
339	childcount = childcount + 1
340	pmc_parent_for_child(childcount) = i
341	ENDIF
342	ENDDO
343	!
344	!-- Get the size of the parent model
345	IF ( m_my_cpl_id > 1 ) THEN
346	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, &
347	istat)
348	ELSE
349	!
350	!-- The root model does not have a parent
351	m_parent_remote_size = -1
352	ENDIF
353	!
354	!-- Set myid to non-tero value except for the root domain. This is a setting
355	!-- for the message routine which is called at the end of pmci_init. That
356	!-- routine outputs messages for myid = 0, only. However, myid has not been
357	!-- assigened so far, so that all PEs of the root model would output a
358	!-- message. To avoid this, set myid to some other value except for PE0 of the
359	!-- root domain.
360	IF ( m_world_rank /= 0 ) myid = 1
361
362	END SUBROUTINE PMC_init_model
363
364
365
366	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, &
367	cpl_parent_id, lower_left_x, lower_left_y, &
368	ncpl, npe_total, request_for_cpl_id )
369	!
370	!-- Provide module private variables of the pmc for PALM
371
372	USE kinds
373
374	IMPLICIT NONE
375
376	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
377
378	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
379
380	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
381	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
382	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
383	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
384	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
385
386	INTEGER :: requested_cpl_id !<
387
388	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
389	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
390
391	!
392	!-- Set the requested coupler id
393	IF ( PRESENT( request_for_cpl_id ) ) THEN
394	requested_cpl_id = request_for_cpl_id
395	!
396	!-- Check for allowed range of values
397	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
398	ELSE
399	requested_cpl_id = m_my_cpl_id
400	ENDIF
401
402	!
403	!-- Return the requested information
404	IF ( PRESENT( comm_world_nesting ) ) THEN
405	comm_world_nesting = m_world_comm
406	ENDIF
407	IF ( PRESENT( cpl_id ) ) THEN
408	cpl_id = requested_cpl_id
409	ENDIF
410	IF ( PRESENT( cpl_parent_id ) ) THEN
411	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
412	ENDIF
413	IF ( PRESENT( cpl_name ) ) THEN
414	cpl_name = m_couplers(requested_cpl_id)%name
415	ENDIF
416	IF ( PRESENT( ncpl ) ) THEN
417	ncpl = m_ncpl
418	ENDIF
419	IF ( PRESENT( npe_total ) ) THEN
420	npe_total = m_couplers(requested_cpl_id)%npe_total
421	ENDIF
422	IF ( PRESENT( lower_left_x ) ) THEN
423	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
424	ENDIF
425	IF ( PRESENT( lower_left_y ) ) THEN
426	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
427	ENDIF
428
429	END SUBROUTINE pmc_get_model_info
430
431
432
433	LOGICAL function pmc_is_rootmodel( )
434
435	IMPLICIT NONE
436
437	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
438
439	END FUNCTION pmc_is_rootmodel
440
441
442
443	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
444	pmc_status )
445
446	IMPLICIT NONE
447
448	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode
449	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode
450
451	INTEGER(iwp), INTENT(INOUT) :: pmc_status
452	INTEGER(iwp) :: bad_llcorner
453	INTEGER(iwp) :: i
454	INTEGER(iwp) :: istat
455
456	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts
457
458	NAMELIST /nestpar/ domain_layouts, nesting_datatransfer_mode, nesting_mode
459
460	!
461	!-- Initialize some coupling variables
462	domain_layouts(1:pmc_max_models)%id = -1
463	m_ncpl = 0
464
465	pmc_status = pmc_status_ok
466
467	!
468	!-- Open the NAMELIST-file and read the nesting layout
469	CALL check_open( 11 )
470	READ ( 11, nestpar, IOSTAT=istat )
471
472	IF ( istat < 0 ) THEN
473
474	!
475	!-- No nestpar-NAMELIST found
476	pmc_status = pmc_no_namelist_found
477
478	!
479	!-- Set filepointer to the beginning of the file. Otherwise PE0 will later
480	!-- be unable to read the inipar-NAMELIST
481	REWIND ( 11 )
482	RETURN
483
484	ELSEIF ( istat > 0 ) THEN
485
486	!
487	!-- Errors in reading nestpar-NAMELIST
488	pmc_status = pmc_namelist_error
489	RETURN
490
491	ENDIF
492
493	!
494	!-- Output location message
495	CALL location_message( 'initialize communicators for nesting', .FALSE. )
496
497	!
498	!-- Assign the layout to the internally used variable
499	m_couplers = domain_layouts
500
501	!
502	!-- Get the number of nested models given in the nestpar-NAMELIST
503	DO i = 1, pmc_max_models
504	!
505	!-- When id=-1 is found for the first time, the list of domains is finished
506	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
507	IF ( m_couplers(i)%id == -1 ) THEN
508	m_ncpl = i - 1
509	EXIT
510	ELSE
511	m_ncpl = pmc_max_models
512	ENDIF
513	ENDIF
514
515	ENDDO
516
517	!
518	!-- Make sure that all domains have equal lower left corner in case of vertical
519	!-- nesting
520	IF ( nesting_mode == 'vertical' ) THEN
521	bad_llcorner = 0
522	DO i = 1, m_ncpl
523	IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR. &
524	domain_layouts(i)%lower_left_y /= 0.0_wp ) THEN
525	bad_llcorner = bad_llcorner + 1
526	domain_layouts(i)%lower_left_x = 0.0_wp
527	domain_layouts(i)%lower_left_y = 0.0_wp
528	ENDIF
529	ENDDO
530	IF ( bad_llcorner /= 0) THEN
531	WRITE ( message_string, *) 'lower left corners do not match,', &
532	'they were set to (0, 0)'
533	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
534	ENDIF
535	ENDIF
536
537	END SUBROUTINE read_coupling_layout
538
539	#endif
540	END MODULE pmc_handle_communicator

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