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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 2918

Last change on this file since 2918 was 2841, checked in by knoop, 6 years ago
Bugfix: wrong placement of include 'mpif.h' corrected
Property svn:keywords set to `Id`
File size: 19.3 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 1997-2018 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: pmc_handle_communicator_mod.f90 2841 2018-02-27 15:02:57Z gronemeier $
27	! Bugfix: wrong placement of include 'mpif.h' corrected
28	!
29	! 2801 2018-02-14 16:01:55Z thiele
30	! Introduce particle transfer in nested models.
31	!
32	! 2718 2018-01-02 08:49:38Z maronga
33	! Corrected "Former revisions" section
34	!
35	! 2696 2017-12-14 17:12:51Z kanani
36	! Change in file header (GPL part)
37	! Bugfix, give Intent(inout) attributes in routine reading nestpar-namelist (MS)
38	!
39	! 2599 2017-11-01 13:18:45Z hellstea
40	! Separate peer communicator peer_comm introduced for MPI_INTERCOMM_CREATE.
41	! Some cleanup and commenting improvements.
42	!
43	! 2516 2017-10-04 11:03:04Z suehring
44	! Remove tabs
45	!
46	! 2514 2017-10-04 09:52:37Z suehring
47	! Bugfix, set filepointer to the beginning of the file after namelist read,
48	! in order to assure that further namelists are also found.
49	!
50	! 2279 2017-06-12 15:23:44Z suehring
51	! Error message text changed
52	!
53	! 2101 2017-01-05 16:42:31Z suehring
54	!
55	! 2013 2016-09-21 13:07:56Z suehring
56	! Bugfix in format descriptor
57	!
58	! 2000 2016-08-20 18:09:15Z knoop
59	! Forced header and separation lines into 80 columns
60	!
61	! 1938 2016-06-13 15:26:05Z hellstea
62	! Minor clean-up.
63	!
64	! 1901 2016-05-04 15:39:38Z raasch
65	! Initial version of purely vertical nesting introduced.
66	! Code clean up. The words server/client changed to parent/child.
67	!
68	! 1900 2016-05-04 15:27:53Z raasch
69	! re-formatting to match PALM style
70	!
71	! 1882 2016-04-20 15:24:46Z hellstea
72	! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
73	! are moved out from the DO i = 1, m_ncpl loop.
74	!
75	! 1850 2016-04-08 13:29:27Z maronga
76	! Module renamed
77	!
78	! 1808 2016-04-05 19:44:00Z raasch
79	! MPI module used by default on all machines
80	!
81	! 1797 2016-03-21 16:50:28Z raasch
82	! introduction of different datatransfer modes,
83	! export of comm_world_nesting
84	!
85	! 1791 2016-03-11 10:41:25Z raasch
86	! m_nrofcpl renamed m_ncpl,
87	! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
88	! renamed and some added,
89	! debug write-statements commented out
90	!
91	! 1786 2016-03-08 05:49:27Z raasch
92	! Bugfix: nesting_mode is broadcast now
93	!
94	! 1779 2016-03-03 08:01:28Z raasch
95	! only the total number of PEs is given in the nestpar-NAMELIST,
96	! additional comments included
97	!
98	! 1764 2016-02-28 12:45:19Z raasch
99	! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
100	! the beginning of the variable list,
101	! domain layout is read with new NAMELIST nestpar from standard file PARIN,
102	! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
103	! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
104	! general format changed to PALM style
105	!
106	! 1762 2016-02-25 12:31:13Z hellstea
107	! Initial revision by K. Ketelsen
108	!
109	! Description:
110	! ------------
111	! Handle MPI communicator in PALM model coupler
112	!-------------------------------------------------------------------------------!
113	MODULE PMC_handle_communicator
114	#if defined( __parallel )
115	USE kinds
116
117	#if !defined( __mpifh )
118	USE MPI
119	#endif
120
121	USE pmc_general, &
122	ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
123	USE control_parameters, &
124	ONLY: message_string
125
126	IMPLICIT NONE
127
128	#if defined( __mpifh )
129	INCLUDE "mpif.h"
130	#endif
131
132	TYPE pmc_layout
133
134	CHARACTER(LEN=32) :: name
135
136	INTEGER :: id !<
137	INTEGER :: parent_id !<
138	INTEGER :: npe_total !<
139
140	REAL(wp) :: lower_left_x !<
141	REAL(wp) :: lower_left_y !<
142
143	END TYPE pmc_layout
144
145	PUBLIC pmc_status_ok, pmc_status_error
146
147	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of processes
148	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nestpar namelist
149	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
150
151	INTEGER :: m_world_comm !< global nesting communicator
152	INTEGER :: m_my_cpl_id !< coupler id of this model
153	INTEGER :: m_parent_id !< coupler id of parent of this model
154	INTEGER :: m_ncpl !< number of couplers given in nestpar namelist
155
156	TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
157
158	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
159	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
160	INTEGER, PUBLIC :: m_world_rank !<
161	INTEGER :: m_world_npes !<
162	INTEGER, PUBLIC :: m_model_rank !<
163	INTEGER, PUBLIC :: m_model_npes !<
164	INTEGER :: m_parent_remote_size !< number of processes in the parent model
165	INTEGER :: peer_comm !< peer_communicator for inter communicators
166
167	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
168	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
169
170
171	INTERFACE pmc_is_rootmodel
172	MODULE PROCEDURE pmc_is_rootmodel
173	END INTERFACE pmc_is_rootmodel
174
175	INTERFACE pmc_get_model_info
176	MODULE PROCEDURE pmc_get_model_info
177	END INTERFACE pmc_get_model_info
178
179	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
180
181	CONTAINS
182
183	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
184	pmc_status )
185
186	USE control_parameters, &
187	ONLY: message_string
188
189	USE pegrid, &
190	ONLY: myid
191
192	IMPLICIT NONE
193
194	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
195	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
196
197	INTEGER, INTENT(INOUT) :: comm !<
198	INTEGER, INTENT(INOUT) :: pmc_status !<
199
200	INTEGER :: childcount !<
201	INTEGER :: i !<
202	INTEGER :: ierr !<
203	INTEGER :: istat !<
204	INTEGER :: m_my_cpl_rank !<
205	INTEGER :: tag !<
206
207	INTEGER, DIMENSION(pmc_max_models) :: activeparent ! I am active parent for this child ID
208	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe
209
210	pmc_status = pmc_status_ok
211	comm = -1
212	m_world_comm = MPI_COMM_WORLD
213	m_my_cpl_id = -1
214	childcount = 0
215	activeparent = -1
216	start_pe(:) = 0
217
218	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
219	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
220	!
221	!-- Only process 0 of root model reads
222	IF ( m_world_rank == 0 ) THEN
223
224	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
225	pmc_status )
226
227	IF ( pmc_status /= pmc_no_namelist_found .AND. &
228	pmc_status /= pmc_namelist_error ) &
229	THEN
230	!
231	!-- Calculate start PE of every model
232	start_pe(1) = 0
233	DO i = 2, m_ncpl+1
234	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
235	ENDDO
236
237	!
238	!-- The sum of numbers of processes requested by all the domains
239	!-- must be equal to the total number of processes of the run
240	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
241	WRITE ( message_string, '(2A,I6,2A,I6,A)' ) &
242	'nesting-setup requires different number of ', &
243	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
244	'provided (', m_world_npes,')'
245	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
246	ENDIF
247
248	ENDIF
249
250	ENDIF
251	!
252	!-- Broadcast the read status. This synchronises all other processes with
253	!-- process 0 of the root model. Without synchronisation, they would not
254	!-- behave in the correct way (e.g. they would not return in case of a
255	!-- missing NAMELIST).
256	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
257
258	IF ( pmc_status == pmc_no_namelist_found ) THEN
259	!
260	!-- Not a nested run; return the MPI_WORLD communicator
261	comm = MPI_COMM_WORLD
262	RETURN
263
264	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
265	!
266	!-- Only the root model gives the error message. Others are aborted by the
267	!-- message-routine with MPI_ABORT. Must be done this way since myid and
268	!-- comm2d have not yet been assigned at this point.
269	IF ( m_world_rank == 0 ) THEN
270	message_string = 'errors in \$nestpar'
271	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
272	ENDIF
273
274	ENDIF
275
276	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
277	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
278	!
279	!-- Broadcast coupling layout
280	DO i = 1, m_ncpl
281	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
282	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
283	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
284	MPI_COMM_WORLD, istat )
285	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
286	MPI_COMM_WORLD, istat )
287	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
288	MPI_COMM_WORLD, istat )
289	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
290	MPI_COMM_WORLD, istat )
291	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
292	MPI_COMM_WORLD, istat )
293	ENDDO
294	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, &
295	MPI_COMM_WORLD, istat )
296	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), &
297	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
298	!
299	!-- Assign global MPI processes to individual models by setting the couple id
300	DO i = 1, m_ncpl
301	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) &
302	THEN
303	m_my_cpl_id = i
304	EXIT
305	ENDIF
306	ENDDO
307	m_my_cpl_rank = m_world_rank - start_pe(i)
308	!
309	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
310	!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
311	!-- The color of the model is represented by the coupler id
312	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, &
313	istat )
314	!
315	!-- Get size and rank of the model running on this process
316	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
317	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
318	!
319	!-- Broadcast (from process 0) the parent id and id of every model
320	DO i = 1, m_ncpl
321	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, &
322	MPI_COMM_WORLD, istat )
323	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
324	MPI_COMM_WORLD, istat )
325	ENDDO
326	!
327	!-- Save the current model communicator for pmc internal use
328	m_model_comm = comm
329
330	!
331	!-- Create intercommunicator between the parent and children.
332	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
333	!-- different colors.
334	!-- The grouping was done above with MPI_COMM_SPLIT.
335	!-- A duplicate of MPI_COMM_WORLD is created and used as peer communicator
336	!-- (peer_comm) for MPI_INTERCOMM_CREATE.
337	CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr )
338	DO i = 2, m_ncpl
339	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
340	!
341	!-- Identify all children models of the current model and create
342	!-- inter-communicators to connect between the current model and its
343	!-- children models.
344	tag = 500 + i
345	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i), &
346	tag, m_to_child_comm(i), istat)
347	childcount = childcount + 1
348	activeparent(i) = 1
349	ELSEIF ( i == m_my_cpl_id) THEN
350	!
351	!-- Create an inter-communicator to connect between the current
352	!-- model and its parent model.
353	tag = 500 + i
354	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, &
355	start_pe(m_couplers(i)%parent_id), &
356	tag, m_to_parent_comm, istat )
357	ENDIF
358	ENDDO
359	!
360	!-- If I am a parent, count the number of children I have.
361	!-- Although this loop is symmetric on all processes, the "activeparent" flag
362	!-- is true (==1) on the respective individual process only.
363	ALLOCATE( pmc_parent_for_child(childcount+1) )
364
365	childcount = 0
366	DO i = 2, m_ncpl
367	IF ( activeparent(i) == 1 ) THEN
368	childcount = childcount + 1
369	pmc_parent_for_child(childcount) = i
370	ENDIF
371	ENDDO
372	!
373	!-- Get the size of the parent model
374	IF ( m_my_cpl_id > 1 ) THEN
375	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, &
376	istat )
377	ELSE
378	!
379	!-- The root model does not have a parent
380	m_parent_remote_size = -1
381	ENDIF
382	!
383	!-- Set myid to non-zero value except for the root domain. This is a setting
384	!-- for the message routine which is called at the end of pmci_init. That
385	!-- routine outputs messages for myid = 0, only. However, myid has not been
386	!-- assigened so far, so that all processes of the root model would output a
387	!-- message. To avoid this, set myid to some other value except for process 0
388	!-- of the root domain.
389	IF ( m_world_rank /= 0 ) myid = 1
390
391	END SUBROUTINE PMC_init_model
392
393
394
395	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, &
396	cpl_parent_id, lower_left_x, lower_left_y, &
397	ncpl, npe_total, request_for_cpl_id )
398	!
399	!-- Provide module private variables of the pmc for PALM
400
401	USE kinds
402
403	IMPLICIT NONE
404
405	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
406
407	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
408
409	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
410	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
411	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
412	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
413	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
414
415	INTEGER :: requested_cpl_id !<
416
417	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
418	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
419
420	!
421	!-- Set the requested coupler id
422	IF ( PRESENT( request_for_cpl_id ) ) THEN
423	requested_cpl_id = request_for_cpl_id
424	!
425	!-- Check for allowed range of values
426	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
427	ELSE
428	requested_cpl_id = m_my_cpl_id
429	ENDIF
430	!
431	!-- Return the requested information
432	IF ( PRESENT( comm_world_nesting ) ) THEN
433	comm_world_nesting = m_world_comm
434	ENDIF
435	IF ( PRESENT( cpl_id ) ) THEN
436	cpl_id = requested_cpl_id
437	ENDIF
438	IF ( PRESENT( cpl_parent_id ) ) THEN
439	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
440	ENDIF
441	IF ( PRESENT( cpl_name ) ) THEN
442	cpl_name = m_couplers(requested_cpl_id)%name
443	ENDIF
444	IF ( PRESENT( ncpl ) ) THEN
445	ncpl = m_ncpl
446	ENDIF
447	IF ( PRESENT( npe_total ) ) THEN
448	npe_total = m_couplers(requested_cpl_id)%npe_total
449	ENDIF
450	IF ( PRESENT( lower_left_x ) ) THEN
451	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
452	ENDIF
453	IF ( PRESENT( lower_left_y ) ) THEN
454	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
455	ENDIF
456
457	END SUBROUTINE pmc_get_model_info
458
459
460
461	LOGICAL function pmc_is_rootmodel( )
462
463	IMPLICIT NONE
464
465	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
466
467	END FUNCTION pmc_is_rootmodel
468
469
470
471	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
472	pmc_status )
473
474	IMPLICIT NONE
475
476	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode
477	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode
478
479	INTEGER(iwp), INTENT(INOUT) :: pmc_status
480	INTEGER(iwp) :: bad_llcorner
481	INTEGER(iwp) :: i
482	INTEGER(iwp) :: istat
483
484	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts
485
486	NAMELIST /nestpar/ domain_layouts, nesting_datatransfer_mode, nesting_mode
487
488	!
489	!-- Initialize some coupling variables
490	domain_layouts(1:pmc_max_models)%id = -1
491	m_ncpl = 0
492
493	pmc_status = pmc_status_ok
494	!
495	!-- Open the NAMELIST-file and read the nesting layout
496	CALL check_open( 11 )
497	READ ( 11, nestpar, IOSTAT=istat )
498	!
499	!-- Set filepointer to the beginning of the file. Otherwise process 0 will later
500	!-- be unable to read the inipar-NAMELIST
501	REWIND ( 11 )
502
503	IF ( istat < 0 ) THEN
504	!
505	!-- No nestpar-NAMELIST found
506	pmc_status = pmc_no_namelist_found
507	RETURN
508	ELSEIF ( istat > 0 ) THEN
509	!
510	!-- Errors in reading nestpar-NAMELIST
511	pmc_status = pmc_namelist_error
512	RETURN
513	ENDIF
514	!
515	!-- Output location message
516	CALL location_message( 'initialize communicators for nesting', .FALSE. )
517	!
518	!-- Assign the layout to the corresponding internally used variable m_couplers
519	m_couplers = domain_layouts
520	!
521	!-- Get the number of nested models given in the nestpar-NAMELIST
522	DO i = 1, pmc_max_models
523	!
524	!-- When id=-1 is found for the first time, the list of domains is finished
525	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
526	IF ( m_couplers(i)%id == -1 ) THEN
527	m_ncpl = i - 1
528	EXIT
529	ELSE
530	m_ncpl = pmc_max_models
531	ENDIF
532	ENDIF
533	ENDDO
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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