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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 3759

Last change on this file since 3759 was 3655, checked in by knoop, 6 years ago
Bugfix: made "unit" and "found" intend INOUT in module interface subroutines + automatic copyright update
Property svn:keywords set to `Id`
File size: 19.5 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 1997-2019 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: pmc_handle_communicator_mod.f90 3655 2019-01-07 16:51:22Z suehring $
27	! nestpar renamed to nesting_parameters
28	!
29	! 2841 2018-02-27 15:02:57Z knoop
30	! Bugfix: wrong placement of include 'mpif.h' corrected
31	!
32	! 2801 2018-02-14 16:01:55Z thiele
33	! Introduce particle transfer in nested models.
34	!
35	! 2718 2018-01-02 08:49:38Z maronga
36	! Corrected "Former revisions" section
37	!
38	! 2696 2017-12-14 17:12:51Z kanani
39	! Change in file header (GPL part)
40	! Bugfix, give Intent(inout) attributes in routine reading nestpar-namelist (MS)
41	!
42	! 2599 2017-11-01 13:18:45Z hellstea
43	! Separate peer communicator peer_comm introduced for MPI_INTERCOMM_CREATE.
44	! Some cleanup and commenting improvements.
45	!
46	! 2516 2017-10-04 11:03:04Z suehring
47	! Remove tabs
48	!
49	! 2514 2017-10-04 09:52:37Z suehring
50	! Bugfix, set filepointer to the beginning of the file after namelist read,
51	! in order to assure that further namelists are also found.
52	!
53	! 2279 2017-06-12 15:23:44Z suehring
54	! Error message text changed
55	!
56	! 2101 2017-01-05 16:42:31Z suehring
57	!
58	! 2013 2016-09-21 13:07:56Z suehring
59	! Bugfix in format descriptor
60	!
61	! 2000 2016-08-20 18:09:15Z knoop
62	! Forced header and separation lines into 80 columns
63	!
64	! 1938 2016-06-13 15:26:05Z hellstea
65	! Minor clean-up.
66	!
67	! 1901 2016-05-04 15:39:38Z raasch
68	! Initial version of purely vertical nesting introduced.
69	! Code clean up. The words server/client changed to parent/child.
70	!
71	! 1900 2016-05-04 15:27:53Z raasch
72	! re-formatting to match PALM style
73	!
74	! 1882 2016-04-20 15:24:46Z hellstea
75	! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
76	! are moved out from the DO i = 1, m_ncpl loop.
77	!
78	! 1850 2016-04-08 13:29:27Z maronga
79	! Module renamed
80	!
81	! 1808 2016-04-05 19:44:00Z raasch
82	! MPI module used by default on all machines
83	!
84	! 1797 2016-03-21 16:50:28Z raasch
85	! introduction of different datatransfer modes,
86	! export of comm_world_nesting
87	!
88	! 1791 2016-03-11 10:41:25Z raasch
89	! m_nrofcpl renamed m_ncpl,
90	! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
91	! renamed and some added,
92	! debug write-statements commented out
93	!
94	! 1786 2016-03-08 05:49:27Z raasch
95	! Bugfix: nesting_mode is broadcast now
96	!
97	! 1779 2016-03-03 08:01:28Z raasch
98	! only the total number of PEs is given in the nestpar-NAMELIST,
99	! additional comments included
100	!
101	! 1764 2016-02-28 12:45:19Z raasch
102	! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
103	! the beginning of the variable list,
104	! domain layout is read with new NAMELIST nestpar from standard file PARIN,
105	! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
106	! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
107	! general format changed to PALM style
108	!
109	! 1762 2016-02-25 12:31:13Z hellstea
110	! Initial revision by K. Ketelsen
111	!
112	! Description:
113	! ------------
114	! Handle MPI communicator in PALM model coupler
115	!-------------------------------------------------------------------------------!
116	MODULE PMC_handle_communicator
117	#if defined( __parallel )
118	USE kinds
119
120	#if !defined( __mpifh )
121	USE MPI
122	#endif
123
124	USE pmc_general, &
125	ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
126	USE control_parameters, &
127	ONLY: message_string
128
129	IMPLICIT NONE
130
131	#if defined( __mpifh )
132	INCLUDE "mpif.h"
133	#endif
134
135	TYPE pmc_layout
136
137	CHARACTER(LEN=32) :: name
138
139	INTEGER :: id !<
140	INTEGER :: parent_id !<
141	INTEGER :: npe_total !<
142
143	REAL(wp) :: lower_left_x !<
144	REAL(wp) :: lower_left_y !<
145
146	END TYPE pmc_layout
147
148	PUBLIC pmc_status_ok, pmc_status_error
149
150	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of processes
151	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nesting_parameters namelist
152	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
153
154	INTEGER :: m_world_comm !< global nesting communicator
155	INTEGER :: m_my_cpl_id !< coupler id of this model
156	INTEGER :: m_parent_id !< coupler id of parent of this model
157	INTEGER :: m_ncpl !< number of couplers given in nesting_parameters namelist
158
159	TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
160
161	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
162	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
163	INTEGER, PUBLIC :: m_world_rank !<
164	INTEGER :: m_world_npes !<
165	INTEGER, PUBLIC :: m_model_rank !<
166	INTEGER, PUBLIC :: m_model_npes !<
167	INTEGER :: m_parent_remote_size !< number of processes in the parent model
168	INTEGER :: peer_comm !< peer_communicator for inter communicators
169
170	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
171	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
172
173
174	INTERFACE pmc_is_rootmodel
175	MODULE PROCEDURE pmc_is_rootmodel
176	END INTERFACE pmc_is_rootmodel
177
178	INTERFACE pmc_get_model_info
179	MODULE PROCEDURE pmc_get_model_info
180	END INTERFACE pmc_get_model_info
181
182	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
183
184	CONTAINS
185
186	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
187	pmc_status )
188
189	USE control_parameters, &
190	ONLY: message_string
191
192	USE pegrid, &
193	ONLY: myid
194
195	IMPLICIT NONE
196
197	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
198	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
199
200	INTEGER, INTENT(INOUT) :: comm !<
201	INTEGER, INTENT(INOUT) :: pmc_status !<
202
203	INTEGER :: childcount !<
204	INTEGER :: i !<
205	INTEGER :: ierr !<
206	INTEGER :: istat !<
207	INTEGER :: m_my_cpl_rank !<
208	INTEGER :: tag !<
209
210	INTEGER, DIMENSION(pmc_max_models) :: activeparent ! I am active parent for this child ID
211	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe
212
213	pmc_status = pmc_status_ok
214	comm = -1
215	m_world_comm = MPI_COMM_WORLD
216	m_my_cpl_id = -1
217	childcount = 0
218	activeparent = -1
219	start_pe(:) = 0
220
221	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
222	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
223	!
224	!-- Only process 0 of root model reads
225	IF ( m_world_rank == 0 ) THEN
226
227	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
228	pmc_status )
229
230	IF ( pmc_status /= pmc_no_namelist_found .AND. &
231	pmc_status /= pmc_namelist_error ) &
232	THEN
233	!
234	!-- Calculate start PE of every model
235	start_pe(1) = 0
236	DO i = 2, m_ncpl+1
237	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
238	ENDDO
239
240	!
241	!-- The sum of numbers of processes requested by all the domains
242	!-- must be equal to the total number of processes of the run
243	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
244	WRITE ( message_string, '(2A,I6,2A,I6,A)' ) &
245	'nesting-setup requires different number of ', &
246	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
247	'provided (', m_world_npes,')'
248	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
249	ENDIF
250
251	ENDIF
252
253	ENDIF
254	!
255	!-- Broadcast the read status. This synchronises all other processes with
256	!-- process 0 of the root model. Without synchronisation, they would not
257	!-- behave in the correct way (e.g. they would not return in case of a
258	!-- missing NAMELIST).
259	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
260
261	IF ( pmc_status == pmc_no_namelist_found ) THEN
262	!
263	!-- Not a nested run; return the MPI_WORLD communicator
264	comm = MPI_COMM_WORLD
265	RETURN
266
267	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
268	!
269	!-- Only the root model gives the error message. Others are aborted by the
270	!-- message-routine with MPI_ABORT. Must be done this way since myid and
271	!-- comm2d have not yet been assigned at this point.
272	IF ( m_world_rank == 0 ) THEN
273	message_string = 'errors in \$nesting_parameters'
274	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
275	ENDIF
276
277	ENDIF
278
279	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
280	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
281	!
282	!-- Broadcast coupling layout
283	DO i = 1, m_ncpl
284	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
285	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
286	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
287	MPI_COMM_WORLD, istat )
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)%npe_total, 1, MPI_INTEGER, 0, &
291	MPI_COMM_WORLD, istat )
292	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
293	MPI_COMM_WORLD, istat )
294	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
295	MPI_COMM_WORLD, istat )
296	ENDDO
297	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, &
298	MPI_COMM_WORLD, istat )
299	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), &
300	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
301	!
302	!-- Assign global MPI processes to individual models by setting the couple id
303	DO i = 1, m_ncpl
304	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) &
305	THEN
306	m_my_cpl_id = i
307	EXIT
308	ENDIF
309	ENDDO
310	m_my_cpl_rank = m_world_rank - start_pe(i)
311	!
312	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
313	!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
314	!-- The color of the model is represented by the coupler id
315	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, &
316	istat )
317	!
318	!-- Get size and rank of the model running on this process
319	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
320	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
321	!
322	!-- Broadcast (from process 0) the parent id and id of every model
323	DO i = 1, m_ncpl
324	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, &
325	MPI_COMM_WORLD, istat )
326	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
327	MPI_COMM_WORLD, istat )
328	ENDDO
329	!
330	!-- Save the current model communicator for pmc internal use
331	m_model_comm = comm
332
333	!
334	!-- Create intercommunicator between the parent and children.
335	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
336	!-- different colors.
337	!-- The grouping was done above with MPI_COMM_SPLIT.
338	!-- A duplicate of MPI_COMM_WORLD is created and used as peer communicator
339	!-- (peer_comm) for MPI_INTERCOMM_CREATE.
340	CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr )
341	DO i = 2, m_ncpl
342	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
343	!
344	!-- Identify all children models of the current model and create
345	!-- inter-communicators to connect between the current model and its
346	!-- children models.
347	tag = 500 + i
348	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i), &
349	tag, m_to_child_comm(i), istat)
350	childcount = childcount + 1
351	activeparent(i) = 1
352	ELSEIF ( i == m_my_cpl_id) THEN
353	!
354	!-- Create an inter-communicator to connect between the current
355	!-- model and its parent model.
356	tag = 500 + i
357	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, &
358	start_pe(m_couplers(i)%parent_id), &
359	tag, m_to_parent_comm, istat )
360	ENDIF
361	ENDDO
362	!
363	!-- If I am a parent, count the number of children I have.
364	!-- Although this loop is symmetric on all processes, the "activeparent" flag
365	!-- is true (==1) on the respective individual process only.
366	ALLOCATE( pmc_parent_for_child(childcount+1) )
367
368	childcount = 0
369	DO i = 2, m_ncpl
370	IF ( activeparent(i) == 1 ) THEN
371	childcount = childcount + 1
372	pmc_parent_for_child(childcount) = i
373	ENDIF
374	ENDDO
375	!
376	!-- Get the size of the parent model
377	IF ( m_my_cpl_id > 1 ) THEN
378	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, &
379	istat )
380	ELSE
381	!
382	!-- The root model does not have a parent
383	m_parent_remote_size = -1
384	ENDIF
385	!
386	!-- Set myid to non-zero value except for the root domain. This is a setting
387	!-- for the message routine which is called at the end of pmci_init. That
388	!-- routine outputs messages for myid = 0, only. However, myid has not been
389	!-- assigened so far, so that all processes of the root model would output a
390	!-- message. To avoid this, set myid to some other value except for process 0
391	!-- of the root domain.
392	IF ( m_world_rank /= 0 ) myid = 1
393
394	END SUBROUTINE PMC_init_model
395
396
397
398	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, &
399	cpl_parent_id, lower_left_x, lower_left_y, &
400	ncpl, npe_total, request_for_cpl_id )
401	!
402	!-- Provide module private variables of the pmc for PALM
403
404	USE kinds
405
406	IMPLICIT NONE
407
408	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
409
410	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
411
412	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
413	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
414	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
415	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
416	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
417
418	INTEGER :: requested_cpl_id !<
419
420	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
421	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
422
423	!
424	!-- Set the requested coupler id
425	IF ( PRESENT( request_for_cpl_id ) ) THEN
426	requested_cpl_id = request_for_cpl_id
427	!
428	!-- Check for allowed range of values
429	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
430	ELSE
431	requested_cpl_id = m_my_cpl_id
432	ENDIF
433	!
434	!-- Return the requested information
435	IF ( PRESENT( comm_world_nesting ) ) THEN
436	comm_world_nesting = m_world_comm
437	ENDIF
438	IF ( PRESENT( cpl_id ) ) THEN
439	cpl_id = requested_cpl_id
440	ENDIF
441	IF ( PRESENT( cpl_parent_id ) ) THEN
442	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
443	ENDIF
444	IF ( PRESENT( cpl_name ) ) THEN
445	cpl_name = m_couplers(requested_cpl_id)%name
446	ENDIF
447	IF ( PRESENT( ncpl ) ) THEN
448	ncpl = m_ncpl
449	ENDIF
450	IF ( PRESENT( npe_total ) ) THEN
451	npe_total = m_couplers(requested_cpl_id)%npe_total
452	ENDIF
453	IF ( PRESENT( lower_left_x ) ) THEN
454	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
455	ENDIF
456	IF ( PRESENT( lower_left_y ) ) THEN
457	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
458	ENDIF
459
460	END SUBROUTINE pmc_get_model_info
461
462
463
464	LOGICAL function pmc_is_rootmodel( )
465
466	IMPLICIT NONE
467
468	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
469
470	END FUNCTION pmc_is_rootmodel
471
472
473
474	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
475	pmc_status )
476
477	IMPLICIT NONE
478
479	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode
480	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode
481
482	INTEGER(iwp), INTENT(INOUT) :: pmc_status
483	INTEGER(iwp) :: bad_llcorner
484	INTEGER(iwp) :: i
485	INTEGER(iwp) :: istat
486
487	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts
488
489	NAMELIST /nesting_parameters/ domain_layouts, nesting_datatransfer_mode, &
490	nesting_mode
491
492	!
493	!-- Initialize some coupling variables
494	domain_layouts(1:pmc_max_models)%id = -1
495	m_ncpl = 0
496
497	pmc_status = pmc_status_ok
498	!
499	!-- Open the NAMELIST-file and read the nesting layout
500	CALL check_open( 11 )
501	READ ( 11, nesting_parameters, IOSTAT=istat )
502	!
503	!-- Set filepointer to the beginning of the file. Otherwise process 0 will later
504	!-- be unable to read the inipar-NAMELIST
505	REWIND ( 11 )
506
507	IF ( istat < 0 ) THEN
508	!
509	!-- No nesting_parameters-NAMELIST found
510	pmc_status = pmc_no_namelist_found
511	RETURN
512	ELSEIF ( istat > 0 ) THEN
513	!
514	!-- Errors in reading nesting_parameters-NAMELIST
515	pmc_status = pmc_namelist_error
516	RETURN
517	ENDIF
518	!
519	!-- Output location message
520	CALL location_message( 'initialize communicators for nesting', .FALSE. )
521	!
522	!-- Assign the layout to the corresponding internally used variable m_couplers
523	m_couplers = domain_layouts
524	!
525	!-- Get the number of nested models given in the nesting_parameters-NAMELIST
526	DO i = 1, pmc_max_models
527	!
528	!-- When id=-1 is found for the first time, the list of domains is finished
529	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
530	IF ( m_couplers(i)%id == -1 ) THEN
531	m_ncpl = i - 1
532	EXIT
533	ELSE
534	m_ncpl = pmc_max_models
535	ENDIF
536	ENDIF
537	ENDDO
538	!
539	!-- Make sure that all domains have equal lower left corner in case of vertical
540	!-- nesting
541	IF ( nesting_mode == 'vertical' ) THEN
542	bad_llcorner = 0
543	DO i = 1, m_ncpl
544	IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR. &
545	domain_layouts(i)%lower_left_y /= 0.0_wp ) THEN
546	bad_llcorner = bad_llcorner + 1
547	domain_layouts(i)%lower_left_x = 0.0_wp
548	domain_layouts(i)%lower_left_y = 0.0_wp
549	ENDIF
550	ENDDO
551	IF ( bad_llcorner /= 0) THEN
552	WRITE ( message_string, *) 'at least one dimension of lower ', &
553	'left corner of one domain is not 0. ', &
554	'All lower left corners were set to (0, 0)'
555	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
556	ENDIF
557	ENDIF
558
559	END SUBROUTINE read_coupling_layout
560
561	#endif
562	END MODULE pmc_handle_communicator

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