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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 2813

Last change on this file since 2813 was 2801, checked in by thiele, 6 years ago
Introduce particle transfer in nested models
Property svn:keywords set to `Id`
File size: 19.2 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 2801 2018-02-14 16:01:55Z suehring $
27	! Introduce particle transfer in nested models.
28	!
29	! 2718 2018-01-02 08:49:38Z maronga
30	! Corrected "Former revisions" section
31	!
32	! 2696 2017-12-14 17:12:51Z kanani
33	! Change in file header (GPL part)
34	! Bugfix, give Intent(inout) attributes in routine reading nestpar-namelist (MS)
35	!
36	! 2599 2017-11-01 13:18:45Z hellstea
37	! Separate peer communicator peer_comm introduced for MPI_INTERCOMM_CREATE.
38	! Some cleanup and commenting improvements.
39	!
40	! 2516 2017-10-04 11:03:04Z suehring
41	! Remove tabs
42	!
43	! 2514 2017-10-04 09:52:37Z suehring
44	! Bugfix, set filepointer to the beginning of the file after namelist read,
45	! in order to assure that further namelists are also found.
46	!
47	! 2279 2017-06-12 15:23:44Z suehring
48	! Error message text changed
49	!
50	! 2101 2017-01-05 16:42:31Z suehring
51	!
52	! 2013 2016-09-21 13:07:56Z suehring
53	! Bugfix in format descriptor
54	!
55	! 2000 2016-08-20 18:09:15Z knoop
56	! Forced header and separation lines into 80 columns
57	!
58	! 1938 2016-06-13 15:26:05Z hellstea
59	! Minor clean-up.
60	!
61	! 1901 2016-05-04 15:39:38Z raasch
62	! Initial version of purely vertical nesting introduced.
63	! Code clean up. The words server/client changed to parent/child.
64	!
65	! 1900 2016-05-04 15:27:53Z raasch
66	! re-formatting to match PALM style
67	!
68	! 1882 2016-04-20 15:24:46Z hellstea
69	! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
70	! are moved out from the DO i = 1, m_ncpl loop.
71	!
72	! 1850 2016-04-08 13:29:27Z maronga
73	! Module renamed
74	!
75	! 1808 2016-04-05 19:44:00Z raasch
76	! MPI module used by default on all machines
77	!
78	! 1797 2016-03-21 16:50:28Z raasch
79	! introduction of different datatransfer modes,
80	! export of comm_world_nesting
81	!
82	! 1791 2016-03-11 10:41:25Z raasch
83	! m_nrofcpl renamed m_ncpl,
84	! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
85	! renamed and some added,
86	! debug write-statements commented out
87	!
88	! 1786 2016-03-08 05:49:27Z raasch
89	! Bugfix: nesting_mode is broadcast now
90	!
91	! 1779 2016-03-03 08:01:28Z raasch
92	! only the total number of PEs is given in the nestpar-NAMELIST,
93	! additional comments included
94	!
95	! 1764 2016-02-28 12:45:19Z raasch
96	! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
97	! the beginning of the variable list,
98	! domain layout is read with new NAMELIST nestpar from standard file PARIN,
99	! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
100	! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
101	! general format changed to PALM style
102	!
103	! 1762 2016-02-25 12:31:13Z hellstea
104	! Initial revision by K. Ketelsen
105	!
106	! Description:
107	! ------------
108	! Handle MPI communicator in PALM model coupler
109	!-------------------------------------------------------------------------------!
110	MODULE PMC_handle_communicator
111	#if defined( __parallel )
112	USE kinds
113
114	#if defined( __mpifh )
115	INCLUDE "mpif.h"
116	#else
117	USE MPI
118	#endif
119
120	USE pmc_general, &
121	ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
122	USE control_parameters, &
123	ONLY: message_string
124
125	IMPLICIT NONE
126
127	TYPE pmc_layout
128
129	CHARACTER(LEN=32) :: name
130
131	INTEGER :: id !<
132	INTEGER :: parent_id !<
133	INTEGER :: npe_total !<
134
135	REAL(wp) :: lower_left_x !<
136	REAL(wp) :: lower_left_y !<
137
138	END TYPE pmc_layout
139
140	PUBLIC pmc_status_ok, pmc_status_error
141
142	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of processes
143	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nestpar namelist
144	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
145
146	INTEGER :: m_world_comm !< global nesting communicator
147	INTEGER :: m_my_cpl_id !< coupler id of this model
148	INTEGER :: m_parent_id !< coupler id of parent of this model
149	INTEGER :: m_ncpl !< number of couplers given in nestpar namelist
150
151	TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
152
153	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
154	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
155	INTEGER, PUBLIC :: m_world_rank !<
156	INTEGER :: m_world_npes !<
157	INTEGER, PUBLIC :: m_model_rank !<
158	INTEGER, PUBLIC :: m_model_npes !<
159	INTEGER :: m_parent_remote_size !< number of processes in the parent model
160	INTEGER :: peer_comm !< peer_communicator for inter communicators
161
162	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
163	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
164
165
166	INTERFACE pmc_is_rootmodel
167	MODULE PROCEDURE pmc_is_rootmodel
168	END INTERFACE pmc_is_rootmodel
169
170	INTERFACE pmc_get_model_info
171	MODULE PROCEDURE pmc_get_model_info
172	END INTERFACE pmc_get_model_info
173
174	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
175
176	CONTAINS
177
178	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
179	pmc_status )
180
181	USE control_parameters, &
182	ONLY: message_string
183
184	USE pegrid, &
185	ONLY: myid
186
187	IMPLICIT NONE
188
189	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
190	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
191
192	INTEGER, INTENT(INOUT) :: comm !<
193	INTEGER, INTENT(INOUT) :: pmc_status !<
194
195	INTEGER :: childcount !<
196	INTEGER :: i !<
197	INTEGER :: ierr !<
198	INTEGER :: istat !<
199	INTEGER :: m_my_cpl_rank !<
200	INTEGER :: tag !<
201
202	INTEGER, DIMENSION(pmc_max_models) :: activeparent ! I am active parent for this child ID
203	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe
204
205	pmc_status = pmc_status_ok
206	comm = -1
207	m_world_comm = MPI_COMM_WORLD
208	m_my_cpl_id = -1
209	childcount = 0
210	activeparent = -1
211	start_pe(:) = 0
212
213	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
214	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
215	!
216	!-- Only process 0 of root model reads
217	IF ( m_world_rank == 0 ) THEN
218
219	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
220	pmc_status )
221
222	IF ( pmc_status /= pmc_no_namelist_found .AND. &
223	pmc_status /= pmc_namelist_error ) &
224	THEN
225	!
226	!-- Calculate start PE of every model
227	start_pe(1) = 0
228	DO i = 2, m_ncpl+1
229	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
230	ENDDO
231
232	!
233	!-- The sum of numbers of processes requested by all the domains
234	!-- must be equal to the total number of processes of the run
235	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
236	WRITE ( message_string, '(2A,I6,2A,I6,A)' ) &
237	'nesting-setup requires different number of ', &
238	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
239	'provided (', m_world_npes,')'
240	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
241	ENDIF
242
243	ENDIF
244
245	ENDIF
246	!
247	!-- Broadcast the read status. This synchronises all other processes with
248	!-- process 0 of the root model. Without synchronisation, they would not
249	!-- behave in the correct way (e.g. they would not return in case of a
250	!-- missing NAMELIST).
251	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
252
253	IF ( pmc_status == pmc_no_namelist_found ) THEN
254	!
255	!-- Not a nested run; return the MPI_WORLD communicator
256	comm = MPI_COMM_WORLD
257	RETURN
258
259	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
260	!
261	!-- Only the root model gives the error message. Others are aborted by the
262	!-- message-routine with MPI_ABORT. Must be done this way since myid and
263	!-- comm2d have not yet been assigned at this point.
264	IF ( m_world_rank == 0 ) THEN
265	message_string = 'errors in \$nestpar'
266	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
267	ENDIF
268
269	ENDIF
270
271	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
272	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
273	!
274	!-- Broadcast coupling layout
275	DO i = 1, m_ncpl
276	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
277	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
278	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
279	MPI_COMM_WORLD, istat )
280	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
281	MPI_COMM_WORLD, istat )
282	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
283	MPI_COMM_WORLD, istat )
284	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
285	MPI_COMM_WORLD, istat )
286	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
287	MPI_COMM_WORLD, istat )
288	ENDDO
289	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, &
290	MPI_COMM_WORLD, istat )
291	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), &
292	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
293	!
294	!-- Assign global MPI processes to individual models by setting the couple id
295	DO i = 1, m_ncpl
296	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) &
297	THEN
298	m_my_cpl_id = i
299	EXIT
300	ENDIF
301	ENDDO
302	m_my_cpl_rank = m_world_rank - start_pe(i)
303	!
304	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
305	!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
306	!-- The color of the model is represented by the coupler id
307	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, &
308	istat )
309	!
310	!-- Get size and rank of the model running on this process
311	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
312	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
313	!
314	!-- Broadcast (from process 0) the parent id and id of every model
315	DO i = 1, m_ncpl
316	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, &
317	MPI_COMM_WORLD, istat )
318	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
319	MPI_COMM_WORLD, istat )
320	ENDDO
321	!
322	!-- Save the current model communicator for pmc internal use
323	m_model_comm = comm
324
325	!
326	!-- Create intercommunicator between the parent and children.
327	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
328	!-- different colors.
329	!-- The grouping was done above with MPI_COMM_SPLIT.
330	!-- A duplicate of MPI_COMM_WORLD is created and used as peer communicator
331	!-- (peer_comm) for MPI_INTERCOMM_CREATE.
332	CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr )
333	DO i = 2, m_ncpl
334	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
335	!
336	!-- Identify all children models of the current model and create
337	!-- inter-communicators to connect between the current model and its
338	!-- children models.
339	tag = 500 + i
340	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i), &
341	tag, m_to_child_comm(i), istat)
342	childcount = childcount + 1
343	activeparent(i) = 1
344	ELSEIF ( i == m_my_cpl_id) THEN
345	!
346	!-- Create an inter-communicator to connect between the current
347	!-- model and its parent model.
348	tag = 500 + i
349	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, &
350	start_pe(m_couplers(i)%parent_id), &
351	tag, m_to_parent_comm, istat )
352	ENDIF
353	ENDDO
354	!
355	!-- If I am a parent, count the number of children I have.
356	!-- Although this loop is symmetric on all processes, the "activeparent" flag
357	!-- is true (==1) on the respective individual process only.
358	ALLOCATE( pmc_parent_for_child(childcount+1) )
359
360	childcount = 0
361	DO i = 2, m_ncpl
362	IF ( activeparent(i) == 1 ) THEN
363	childcount = childcount + 1
364	pmc_parent_for_child(childcount) = i
365	ENDIF
366	ENDDO
367	!
368	!-- Get the size of the parent model
369	IF ( m_my_cpl_id > 1 ) THEN
370	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, &
371	istat )
372	ELSE
373	!
374	!-- The root model does not have a parent
375	m_parent_remote_size = -1
376	ENDIF
377	!
378	!-- Set myid to non-zero value except for the root domain. This is a setting
379	!-- for the message routine which is called at the end of pmci_init. That
380	!-- routine outputs messages for myid = 0, only. However, myid has not been
381	!-- assigened so far, so that all processes of the root model would output a
382	!-- message. To avoid this, set myid to some other value except for process 0
383	!-- of the root domain.
384	IF ( m_world_rank /= 0 ) myid = 1
385
386	END SUBROUTINE PMC_init_model
387
388
389
390	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, &
391	cpl_parent_id, lower_left_x, lower_left_y, &
392	ncpl, npe_total, request_for_cpl_id )
393	!
394	!-- Provide module private variables of the pmc for PALM
395
396	USE kinds
397
398	IMPLICIT NONE
399
400	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
401
402	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
403
404	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
405	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
406	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
407	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
408	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
409
410	INTEGER :: requested_cpl_id !<
411
412	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
413	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
414
415	!
416	!-- Set the requested coupler id
417	IF ( PRESENT( request_for_cpl_id ) ) THEN
418	requested_cpl_id = request_for_cpl_id
419	!
420	!-- Check for allowed range of values
421	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
422	ELSE
423	requested_cpl_id = m_my_cpl_id
424	ENDIF
425	!
426	!-- Return the requested information
427	IF ( PRESENT( comm_world_nesting ) ) THEN
428	comm_world_nesting = m_world_comm
429	ENDIF
430	IF ( PRESENT( cpl_id ) ) THEN
431	cpl_id = requested_cpl_id
432	ENDIF
433	IF ( PRESENT( cpl_parent_id ) ) THEN
434	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
435	ENDIF
436	IF ( PRESENT( cpl_name ) ) THEN
437	cpl_name = m_couplers(requested_cpl_id)%name
438	ENDIF
439	IF ( PRESENT( ncpl ) ) THEN
440	ncpl = m_ncpl
441	ENDIF
442	IF ( PRESENT( npe_total ) ) THEN
443	npe_total = m_couplers(requested_cpl_id)%npe_total
444	ENDIF
445	IF ( PRESENT( lower_left_x ) ) THEN
446	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
447	ENDIF
448	IF ( PRESENT( lower_left_y ) ) THEN
449	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
450	ENDIF
451
452	END SUBROUTINE pmc_get_model_info
453
454
455
456	LOGICAL function pmc_is_rootmodel( )
457
458	IMPLICIT NONE
459
460	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
461
462	END FUNCTION pmc_is_rootmodel
463
464
465
466	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
467	pmc_status )
468
469	IMPLICIT NONE
470
471	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode
472	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode
473
474	INTEGER(iwp), INTENT(INOUT) :: pmc_status
475	INTEGER(iwp) :: bad_llcorner
476	INTEGER(iwp) :: i
477	INTEGER(iwp) :: istat
478
479	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts
480
481	NAMELIST /nestpar/ domain_layouts, nesting_datatransfer_mode, nesting_mode
482
483	!
484	!-- Initialize some coupling variables
485	domain_layouts(1:pmc_max_models)%id = -1
486	m_ncpl = 0
487
488	pmc_status = pmc_status_ok
489	!
490	!-- Open the NAMELIST-file and read the nesting layout
491	CALL check_open( 11 )
492	READ ( 11, nestpar, IOSTAT=istat )
493	!
494	!-- Set filepointer to the beginning of the file. Otherwise process 0 will later
495	!-- be unable to read the inipar-NAMELIST
496	REWIND ( 11 )
497
498	IF ( istat < 0 ) THEN
499	!
500	!-- No nestpar-NAMELIST found
501	pmc_status = pmc_no_namelist_found
502	RETURN
503	ELSEIF ( istat > 0 ) THEN
504	!
505	!-- Errors in reading nestpar-NAMELIST
506	pmc_status = pmc_namelist_error
507	RETURN
508	ENDIF
509	!
510	!-- Output location message
511	CALL location_message( 'initialize communicators for nesting', .FALSE. )
512	!
513	!-- Assign the layout to the corresponding internally used variable m_couplers
514	m_couplers = domain_layouts
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	ENDDO
529	!
530	!-- Make sure that all domains have equal lower left corner in case of vertical
531	!-- nesting
532	IF ( nesting_mode == 'vertical' ) THEN
533	bad_llcorner = 0
534	DO i = 1, m_ncpl
535	IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR. &
536	domain_layouts(i)%lower_left_y /= 0.0_wp ) THEN
537	bad_llcorner = bad_llcorner + 1
538	domain_layouts(i)%lower_left_x = 0.0_wp
539	domain_layouts(i)%lower_left_y = 0.0_wp
540	ENDIF
541	ENDDO
542	IF ( bad_llcorner /= 0) THEN
543	WRITE ( message_string, *) 'at least one dimension of lower ', &
544	'left corner of one domain is not 0. ', &
545	'All lower left corners were set to (0, 0)'
546	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
547	ENDIF
548	ENDIF
549
550	END SUBROUTINE read_coupling_layout
551
552	#endif
553	END MODULE pmc_handle_communicator

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