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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 2576

Last change on this file since 2576 was 2516, 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 2516 2017-10-04 11:03:04Z Giersch $
28	! Remove tabs
29	!
30	! 2514 2017-10-04 09:52:37Z suehring
31	! Bugfix, set filepointer to the beginning of the file after namelist read,
32	! in order to assure that further namelists are also found.
33	!
34	! 2279 2017-06-12 15:23:44Z suehring
35	! Error message text changed
36	!
37	! 2101 2017-01-05 16:42:31Z suehring
38	!
39	! 2013 2016-09-21 13:07:56Z suehring
40	! Bugfix in format descriptor
41	!
42	! 2000 2016-08-20 18:09:15Z knoop
43	! Forced header and separation lines into 80 columns
44	!
45	! 1938 2016-06-13 15:26:05Z hellstea
46	! Minor clean-up.
47	!
48	! 1901 2016-05-04 15:39:38Z raasch
49	! Initial version of purely vertical nesting introduced.
50	! Code clean up. The words server/client changed to parent/child.
51	!
52	! 1900 2016-05-04 15:27:53Z raasch
53	! re-formatting to match PALM style
54	!
55	! 1882 2016-04-20 15:24:46Z hellstea
56	! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
57	! are moved out from the DO i = 1, m_ncpl loop.
58	!
59	! 1850 2016-04-08 13:29:27Z maronga
60	! Module renamed
61	!
62	! 1808 2016-04-05 19:44:00Z raasch
63	! MPI module used by default on all machines
64	!
65	! 1797 2016-03-21 16:50:28Z raasch
66	! introduction of different datatransfer modes,
67	! export of comm_world_nesting
68	!
69	! 1791 2016-03-11 10:41:25Z raasch
70	! m_nrofcpl renamed m_ncpl,
71	! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
72	! renamed and some added,
73	! debug write-statements commented out
74	!
75	! 1786 2016-03-08 05:49:27Z raasch
76	! Bugfix: nesting_mode is broadcast now
77	!
78	! 1779 2016-03-03 08:01:28Z raasch
79	! only the total number of PEs is given in the nestpar-NAMELIST,
80	! additional comments included
81	!
82	! 1764 2016-02-28 12:45:19Z raasch
83	! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
84	! the beginning of the variable list,
85	! domain layout is read with new NAMELIST nestpar from standard file PARIN,
86	! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
87	! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
88	! general format changed to PALM style
89	!
90	! 1762 2016-02-25 12:31:13Z hellstea
91	! Initial revision by K. Ketelsen
92	!
93	! Description:
94	! ------------
95	! Handle MPI communicator in PALM model coupler
96	!-------------------------------------------------------------------------------!
97
98	#if defined( __parallel )
99	USE kinds
100
101	#if defined( __mpifh )
102	INCLUDE "mpif.h"
103	#else
104	USE MPI
105	#endif
106
107	USE pmc_general, &
108	ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
109	USE control_parameters, &
110	ONLY: message_string
111
112	IMPLICIT NONE
113
114	TYPE pmc_layout
115
116	CHARACTER(LEN=32) :: name
117
118	INTEGER :: id !<
119	INTEGER :: parent_id !<
120	INTEGER :: npe_total !<
121
122	REAL(wp) :: lower_left_x !<
123	REAL(wp) :: lower_left_y !<
124
125	END TYPE pmc_layout
126
127	PUBLIC pmc_status_ok, pmc_status_error
128
129	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of PEs
130	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nestpar namelist
131	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
132
133	INTEGER :: m_world_comm !< global nesting communicator
134	INTEGER :: m_my_cpl_id !< coupler id of this modelfortran return
135	INTEGER :: m_parent_id !< coupler id of parent of this model
136	INTEGER :: m_ncpl !< number of couplers given in nestpar namelist
137
138	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
139
140	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
141	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
142	INTEGER, PUBLIC :: m_world_rank !<
143	INTEGER :: m_world_npes !<
144	INTEGER, PUBLIC :: m_model_rank !<
145	INTEGER, PUBLIC :: m_model_npes !<
146	INTEGER :: m_parent_remote_size !< number of parent PEs
147
148	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
149	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
150
151
152	INTERFACE pmc_is_rootmodel
153	MODULE PROCEDURE pmc_is_rootmodel
154	END INTERFACE pmc_is_rootmodel
155
156	INTERFACE pmc_get_model_info
157	MODULE PROCEDURE pmc_get_model_info
158	END INTERFACE pmc_get_model_info
159
160	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
161
162	CONTAINS
163
164	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
165	pmc_status )
166
167	USE control_parameters, &
168	ONLY: message_string
169
170	USE pegrid, &
171	ONLY: myid
172
173	IMPLICIT NONE
174
175	CHARACTER(LEN=8), INTENT(OUT) :: nesting_mode !<
176	CHARACTER(LEN=7), INTENT(OUT) :: nesting_datatransfer_mode !<
177
178	INTEGER, INTENT(OUT) :: comm !<
179	INTEGER, INTENT(OUT) :: pmc_status !<
180
181	INTEGER :: childcount !<
182	INTEGER :: i !<
183	INTEGER :: ierr !<
184	INTEGER :: istat !<
185	INTEGER :: m_my_cpl_rank !<
186	INTEGER :: tag !<
187
188	INTEGER, DIMENSION(pmc_max_models) :: activeparent ! I am active parent for this child ID
189	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe
190
191	pmc_status = pmc_status_ok
192	comm = -1
193	m_world_comm = MPI_COMM_WORLD
194	m_my_cpl_id = -1
195	childcount = 0
196	activeparent = -1
197	start_pe(:) = 0
198
199	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
200	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
201	!
202	!-- Only PE 0 of root model reads
203	IF ( m_world_rank == 0 ) THEN
204
205	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
206	pmc_status )
207
208	IF ( pmc_status /= pmc_no_namelist_found .AND. &
209	pmc_status /= pmc_namelist_error ) &
210	THEN
211	!
212	!-- Calculate start PE of every model
213	start_pe(1) = 0
214	DO i = 2, m_ncpl+1
215	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
216	ENDDO
217
218	!
219	!-- The number of cores provided with the run must be the same as the
220	!-- total sum of cores required by all nest domains
221	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
222	WRITE ( message_string, '(2A,I6,2A,I6,A)' ) &
223	'nesting-setup requires different number of ', &
224	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
225	'provided (', m_world_npes,')'
226	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
227	ENDIF
228
229	ENDIF
230
231	ENDIF
232	!
233	!-- Broadcast the read status. This synchronises all other PEs with PE 0 of
234	!-- the root model. Without synchronisation, they would not behave in the
235	!-- correct way (e.g. they would not return in case of a missing NAMELIST)
236	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
237
238	IF ( pmc_status == pmc_no_namelist_found ) THEN
239	!
240	!-- Not a nested run; return the MPI_WORLD communicator
241	comm = MPI_COMM_WORLD
242	RETURN
243
244	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
245	!
246	!-- Only the root model gives the error message. Others are aborted by the
247	!-- message-routine with MPI_ABORT. Must be done this way since myid and
248	!-- comm2d have not yet been assigned at this point.
249	IF ( m_world_rank == 0 ) THEN
250	message_string = 'errors in \$nestpar'
251	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
252	ENDIF
253
254	ENDIF
255
256	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
257	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat)
258
259	!
260	!-- Broadcast coupling layout
261	DO i = 1, m_ncpl
262	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
263	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
264	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
265	MPI_COMM_WORLD, istat )
266	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
267	MPI_COMM_WORLD, istat )
268	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
269	MPI_COMM_WORLD, istat )
270	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
271	MPI_COMM_WORLD, istat )
272	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
273	MPI_COMM_WORLD, istat )
274	ENDDO
275	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, &
276	MPI_COMM_WORLD, istat )
277	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), &
278	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
279
280	!
281	!-- Assign global MPI processes to individual models by setting the couple id
282	DO i = 1, m_ncpl
283	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) &
284	THEN
285	m_my_cpl_id = i
286	EXIT
287	ENDIF
288	ENDDO
289	m_my_cpl_rank = m_world_rank - start_pe(i)
290
291	!
292	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
293	!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
294	!-- The color of the model is represented by the coupler id
295	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, &
296	istat )
297	!
298	!-- Get size and rank of the model running on this PE
299	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
300	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
301
302	!
303	!-- Broadcast (from PE 0) the parent id and id of every model
304	DO i = 1, m_ncpl
305	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, &
306	MPI_COMM_WORLD, istat )
307	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
308	MPI_COMM_WORLD, istat )
309	ENDDO
310
311	!
312	!-- Save the current model communicator for pmc internal use
313	m_model_comm = comm
314
315	!
316	!-- Create intercommunicator between parent and children.
317	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
318	!-- different colors.
319	!-- The grouping was done above with MPI_COMM_SPLIT
320	DO i = 2, m_ncpl
321
322	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
323	!
324	!-- Collect parent PEs.
325	!-- Every model exept the root model has a parent model which acts as
326	!-- parent model. Create an intercommunicator to connect current PE to
327	!-- all children PEs
328	tag = 500 + i
329	CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD, start_pe(i), &
330	tag, m_to_child_comm(i), istat)
331	childcount = childcount + 1
332	activeparent(i) = 1
333
334	ELSEIF ( i == m_my_cpl_id) THEN
335	!
336	!-- Collect children PEs.
337	!-- Every model except the root model has a parent model.
338	!-- Create an intercommunicator to connect current PE to all parent PEs
339	tag = 500 + i
340	CALL MPI_INTERCOMM_CREATE( comm, 0, MPI_COMM_WORLD, &
341	start_pe(m_couplers(i)%parent_id), &
342	tag, m_to_parent_comm, istat )
343	ENDIF
344
345	ENDDO
346
347	!
348	!-- If I am parent, count the number of children that I have
349	!-- Although this loop is symmetric on all processes, the "activeparent" flag
350	!-- is true (==1) on the respective individual PE only.
351	ALLOCATE( pmc_parent_for_child(childcount+1) )
352
353	childcount = 0
354	DO i = 2, m_ncpl
355	IF ( activeparent(i) == 1 ) THEN
356	childcount = childcount + 1
357	pmc_parent_for_child(childcount) = i
358	ENDIF
359	ENDDO
360	!
361	!-- Get the size of the parent model
362	IF ( m_my_cpl_id > 1 ) THEN
363	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, &
364	istat)
365	ELSE
366	!
367	!-- The root model does not have a parent
368	m_parent_remote_size = -1
369	ENDIF
370	!
371	!-- Set myid to non-tero value except for the root domain. This is a setting
372	!-- for the message routine which is called at the end of pmci_init. That
373	!-- routine outputs messages for myid = 0, only. However, myid has not been
374	!-- assigened so far, so that all PEs of the root model would output a
375	!-- message. To avoid this, set myid to some other value except for PE0 of the
376	!-- root domain.
377	IF ( m_world_rank /= 0 ) myid = 1
378
379	END SUBROUTINE PMC_init_model
380
381
382
383	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, &
384	cpl_parent_id, lower_left_x, lower_left_y, &
385	ncpl, npe_total, request_for_cpl_id )
386	!
387	!-- Provide module private variables of the pmc for PALM
388
389	USE kinds
390
391	IMPLICIT NONE
392
393	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
394
395	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
396
397	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
398	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
399	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
400	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
401	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
402
403	INTEGER :: requested_cpl_id !<
404
405	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
406	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
407
408	!
409	!-- Set the requested coupler id
410	IF ( PRESENT( request_for_cpl_id ) ) THEN
411	requested_cpl_id = request_for_cpl_id
412	!
413	!-- Check for allowed range of values
414	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
415	ELSE
416	requested_cpl_id = m_my_cpl_id
417	ENDIF
418
419	!
420	!-- Return the requested information
421	IF ( PRESENT( comm_world_nesting ) ) THEN
422	comm_world_nesting = m_world_comm
423	ENDIF
424	IF ( PRESENT( cpl_id ) ) THEN
425	cpl_id = requested_cpl_id
426	ENDIF
427	IF ( PRESENT( cpl_parent_id ) ) THEN
428	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
429	ENDIF
430	IF ( PRESENT( cpl_name ) ) THEN
431	cpl_name = m_couplers(requested_cpl_id)%name
432	ENDIF
433	IF ( PRESENT( ncpl ) ) THEN
434	ncpl = m_ncpl
435	ENDIF
436	IF ( PRESENT( npe_total ) ) THEN
437	npe_total = m_couplers(requested_cpl_id)%npe_total
438	ENDIF
439	IF ( PRESENT( lower_left_x ) ) THEN
440	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
441	ENDIF
442	IF ( PRESENT( lower_left_y ) ) THEN
443	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
444	ENDIF
445
446	END SUBROUTINE pmc_get_model_info
447
448
449
450	LOGICAL function pmc_is_rootmodel( )
451
452	IMPLICIT NONE
453
454	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
455
456	END FUNCTION pmc_is_rootmodel
457
458
459
460	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
461	pmc_status )
462
463	IMPLICIT NONE
464
465	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode
466	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode
467
468	INTEGER(iwp), INTENT(INOUT) :: pmc_status
469	INTEGER(iwp) :: bad_llcorner
470	INTEGER(iwp) :: i
471	INTEGER(iwp) :: istat
472
473	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts
474
475	NAMELIST /nestpar/ domain_layouts, nesting_datatransfer_mode, nesting_mode
476
477	!
478	!-- Initialize some coupling variables
479	domain_layouts(1:pmc_max_models)%id = -1
480	m_ncpl = 0
481
482	pmc_status = pmc_status_ok
483
484	!
485	!-- Open the NAMELIST-file and read the nesting layout
486	CALL check_open( 11 )
487	READ ( 11, nestpar, IOSTAT=istat )
488	!
489	!-- Set filepointer to the beginning of the file. Otherwise PE0 will later
490	!-- be unable to read the inipar-NAMELIST
491	REWIND ( 11 )
492
493	IF ( istat < 0 ) THEN
494
495	!
496	!-- No nestpar-NAMELIST found
497	pmc_status = pmc_no_namelist_found
498
499	RETURN
500
501	ELSEIF ( istat > 0 ) THEN
502
503	!
504	!-- Errors in reading nestpar-NAMELIST
505	pmc_status = pmc_namelist_error
506	RETURN
507
508	ENDIF
509
510	!
511	!-- Output location message
512	CALL location_message( 'initialize communicators for nesting', .FALSE. )
513
514	!
515	!-- Assign the layout to the internally used variable
516	m_couplers = domain_layouts
517
518	!
519	!-- Get the number of nested models given in the nestpar-NAMELIST
520	DO i = 1, pmc_max_models
521	!
522	!-- When id=-1 is found for the first time, the list of domains is finished
523	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
524	IF ( m_couplers(i)%id == -1 ) THEN
525	m_ncpl = i - 1
526	EXIT
527	ELSE
528	m_ncpl = pmc_max_models
529	ENDIF
530	ENDIF
531
532	ENDDO
533
534	!
535	!-- Make sure that all domains have equal lower left corner in case of vertical
536	!-- nesting
537	IF ( nesting_mode == 'vertical' ) THEN
538	bad_llcorner = 0
539	DO i = 1, m_ncpl
540	IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR. &
541	domain_layouts(i)%lower_left_y /= 0.0_wp ) THEN
542	bad_llcorner = bad_llcorner + 1
543	domain_layouts(i)%lower_left_x = 0.0_wp
544	domain_layouts(i)%lower_left_y = 0.0_wp
545	ENDIF
546	ENDDO
547	IF ( bad_llcorner /= 0) THEN
548	WRITE ( message_string, *) 'at least one dimension of lower ', &
549	'left corner of one domain is not 0. ', &
550	'All lower left corners were set to (0, 0)'
551	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
552	ENDIF
553	ENDIF
554
555	END SUBROUTINE read_coupling_layout
556
557	#endif
558	END MODULE pmc_handle_communicator

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