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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 4283

Last change on this file since 4283 was 4182, checked in by scharf, 5 years ago
corrected "Former revisions" section minor formatting in "Former revisions" section added "Author" section
Property svn:keywords set to `Id`
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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 4182 2019-08-22 15:20:23Z resler $
27	! Corrected "Former revisions" section
28	!
29	! 3888 2019-04-12 09:18:10Z hellstea
30	! Missing MPI_BCAST of anterpolation_buffer_width added.
31	!
32	! 3885 2019-04-11 11:29:34Z kanani
33	! Changes related to global restructuring of location messages and introduction
34	! of additional debug messages
35	!
36	! 3819 2019-03-27 11:01:36Z hellstea
37	! Adjustable anterpolation buffer introduced on all nest boundaries, it is controlled
38	! by the new nesting_parameters parameter anterpolation_buffer_width.
39	!
40	! 3655 2019-01-07 16:51:22Z knoop
41	! nestpar renamed to nesting_parameters
42	!
43	! 1762 2016-02-25 12:31:13Z hellstea
44	! Initial revision by K. Ketelsen
45	!
46	! Description:
47	! ------------
48	! Handle MPI communicator in PALM model coupler
49	!-------------------------------------------------------------------------------!
50	MODULE PMC_handle_communicator
51	#if defined( __parallel )
52	USE kinds
53
54	#if !defined( __mpifh )
55	USE MPI
56	#endif
57
58	USE pmc_general, &
59	ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
60	USE control_parameters, &
61	ONLY: message_string
62
63	IMPLICIT NONE
64
65	#if defined( __mpifh )
66	INCLUDE "mpif.h"
67	#endif
68
69	TYPE pmc_layout
70
71	CHARACTER(LEN=32) :: name
72
73	INTEGER :: id !<
74	INTEGER :: parent_id !<
75	INTEGER :: npe_total !<
76
77	REAL(wp) :: lower_left_x !<
78	REAL(wp) :: lower_left_y !<
79
80	END TYPE pmc_layout
81
82	PUBLIC pmc_status_ok, pmc_status_error
83
84	INTEGER, PARAMETER, PUBLIC :: pmc_error_npes = 1 !< illegal number of processes
85	INTEGER, PARAMETER, PUBLIC :: pmc_namelist_error = 2 !< error(s) in nesting_parameters namelist
86	INTEGER, PARAMETER, PUBLIC :: pmc_no_namelist_found = 3 !< no couple layout namelist found
87
88	INTEGER :: m_world_comm !< global nesting communicator
89	INTEGER :: m_my_cpl_id !< coupler id of this model
90	INTEGER :: m_parent_id !< coupler id of parent of this model
91	INTEGER :: m_ncpl !< number of couplers given in nesting_parameters namelist
92
93	TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) :: m_couplers !< information of all couplers
94
95	INTEGER, PUBLIC :: m_model_comm !< communicator of this model
96	INTEGER, PUBLIC :: m_to_parent_comm !< communicator to the parent
97	INTEGER, PUBLIC :: m_world_rank !<
98	INTEGER :: m_world_npes !<
99	INTEGER, PUBLIC :: m_model_rank !<
100	INTEGER, PUBLIC :: m_model_npes !<
101	INTEGER :: m_parent_remote_size !< number of processes in the parent model
102	INTEGER :: peer_comm !< peer_communicator for inter communicators
103
104	INTEGER, DIMENSION(pmc_max_models), PUBLIC :: m_to_child_comm !< communicator to the child(ren)
105	INTEGER, DIMENSION(:), POINTER, PUBLIC :: pmc_parent_for_child !<
106
107
108	INTERFACE pmc_is_rootmodel
109	MODULE PROCEDURE pmc_is_rootmodel
110	END INTERFACE pmc_is_rootmodel
111
112	INTERFACE pmc_get_model_info
113	MODULE PROCEDURE pmc_get_model_info
114	END INTERFACE pmc_get_model_info
115
116	PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
117
118	CONTAINS
119
120	SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode, &
121	anterpolation_buffer_width, pmc_status )
122
123	USE control_parameters, &
124	ONLY: message_string
125
126	USE pegrid, &
127	ONLY: myid
128
129	IMPLICIT NONE
130
131	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode !<
132	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode !<
133
134	INTEGER, INTENT(INOUT) :: anterpolation_buffer_width !< Boundary buffer width for anterpolation
135	INTEGER, INTENT(INOUT) :: comm !<
136	INTEGER, INTENT(INOUT) :: pmc_status !<
137
138	INTEGER :: childcount !<
139	INTEGER :: i !<
140	INTEGER :: ierr !<
141	INTEGER :: istat !<
142	INTEGER :: m_my_cpl_rank !<
143	INTEGER :: tag !<
144
145	INTEGER, DIMENSION(pmc_max_models) :: activeparent ! I am active parent for this child ID
146	INTEGER, DIMENSION(pmc_max_models+1) :: start_pe
147
148	pmc_status = pmc_status_ok
149	comm = -1
150	m_world_comm = MPI_COMM_WORLD
151	m_my_cpl_id = -1
152	childcount = 0
153	activeparent = -1
154	start_pe(:) = 0
155
156	CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
157	CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
158	!
159	!-- Only process 0 of root model reads
160	IF ( m_world_rank == 0 ) THEN
161
162	CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
163	anterpolation_buffer_width, pmc_status )
164
165	IF ( pmc_status /= pmc_no_namelist_found .AND. &
166	pmc_status /= pmc_namelist_error ) &
167	THEN
168	!
169	!-- Calculate start PE of every model
170	start_pe(1) = 0
171	DO i = 2, m_ncpl+1
172	start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
173	ENDDO
174
175	!
176	!-- The sum of numbers of processes requested by all the domains
177	!-- must be equal to the total number of processes of the run
178	IF ( start_pe(m_ncpl+1) /= m_world_npes ) THEN
179	WRITE ( message_string, '(2A,I6,2A,I6,A)' ) &
180	'nesting-setup requires different number of ', &
181	'MPI procs (', start_pe(m_ncpl+1), ') than ', &
182	'provided (', m_world_npes,')'
183	CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
184	ENDIF
185
186	ENDIF
187
188	ENDIF
189	!
190	!-- Broadcast the read status. This synchronises all other processes with
191	!-- process 0 of the root model. Without synchronisation, they would not
192	!-- behave in the correct way (e.g. they would not return in case of a
193	!-- missing NAMELIST).
194	CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
195
196	IF ( pmc_status == pmc_no_namelist_found ) THEN
197	!
198	!-- Not a nested run; return the MPI_WORLD communicator
199	comm = MPI_COMM_WORLD
200	RETURN
201
202	ELSEIF ( pmc_status == pmc_namelist_error ) THEN
203	!
204	!-- Only the root model gives the error message. Others are aborted by the
205	!-- message-routine with MPI_ABORT. Must be done this way since myid and
206	!-- comm2d have not yet been assigned at this point.
207	IF ( m_world_rank == 0 ) THEN
208	message_string = 'errors in \$nesting_parameters'
209	CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
210	ENDIF
211
212	ENDIF
213
214	CALL MPI_BCAST( m_ncpl, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
215	CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
216	!
217	!-- Broadcast coupling layout
218	DO i = 1, m_ncpl
219	CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ), &
220	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
221	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
222	MPI_COMM_WORLD, istat )
223	CALL MPI_BCAST( m_couplers(i)%Parent_id, 1, MPI_INTEGER, 0, &
224	MPI_COMM_WORLD, istat )
225	CALL MPI_BCAST( m_couplers(i)%npe_total, 1, MPI_INTEGER, 0, &
226	MPI_COMM_WORLD, istat )
227	CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL, 0, &
228	MPI_COMM_WORLD, istat )
229	CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL, 0, &
230	MPI_COMM_WORLD, istat )
231	ENDDO
232	CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0, &
233	MPI_COMM_WORLD, istat )
234	CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode), &
235	MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
236	CALL MPI_BCAST( anterpolation_buffer_width, 1, MPI_INT, 0, MPI_COMM_WORLD, &
237	istat )
238	!
239	!-- Assign global MPI processes to individual models by setting the couple id
240	DO i = 1, m_ncpl
241	IF ( m_world_rank >= start_pe(i) .AND. m_world_rank < start_pe(i+1) ) &
242	THEN
243	m_my_cpl_id = i
244	EXIT
245	ENDIF
246	ENDDO
247	m_my_cpl_rank = m_world_rank - start_pe(i)
248	!
249	!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
250	!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
251	!-- The color of the model is represented by the coupler id
252	CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm, &
253	istat )
254	!
255	!-- Get size and rank of the model running on this process
256	CALL MPI_COMM_RANK( comm, m_model_rank, istat )
257	CALL MPI_COMM_SIZE( comm, m_model_npes, istat )
258	!
259	!-- Broadcast (from process 0) the parent id and id of every model
260	DO i = 1, m_ncpl
261	CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0, &
262	MPI_COMM_WORLD, istat )
263	CALL MPI_BCAST( m_couplers(i)%id, 1, MPI_INTEGER, 0, &
264	MPI_COMM_WORLD, istat )
265	ENDDO
266	!
267	!-- Save the current model communicator for pmc internal use
268	m_model_comm = comm
269
270	!
271	!-- Create intercommunicator between the parent and children.
272	!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
273	!-- different colors.
274	!-- The grouping was done above with MPI_COMM_SPLIT.
275	!-- A duplicate of MPI_COMM_WORLD is created and used as peer communicator
276	!-- (peer_comm) for MPI_INTERCOMM_CREATE.
277	CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr )
278	DO i = 2, m_ncpl
279	IF ( m_couplers(i)%parent_id == m_my_cpl_id ) THEN
280	!
281	!-- Identify all children models of the current model and create
282	!-- inter-communicators to connect between the current model and its
283	!-- children models.
284	tag = 500 + i
285	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i), &
286	tag, m_to_child_comm(i), istat)
287	childcount = childcount + 1
288	activeparent(i) = 1
289	ELSEIF ( i == m_my_cpl_id) THEN
290	!
291	!-- Create an inter-communicator to connect between the current
292	!-- model and its parent model.
293	tag = 500 + i
294	CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, &
295	start_pe(m_couplers(i)%parent_id), &
296	tag, m_to_parent_comm, istat )
297	ENDIF
298	ENDDO
299	!
300	!-- If I am a parent, count the number of children I have.
301	!-- Although this loop is symmetric on all processes, the "activeparent" flag
302	!-- is true (==1) on the respective individual process only.
303	ALLOCATE( pmc_parent_for_child(childcount+1) )
304
305	childcount = 0
306	DO i = 2, m_ncpl
307	IF ( activeparent(i) == 1 ) THEN
308	childcount = childcount + 1
309	pmc_parent_for_child(childcount) = i
310	ENDIF
311	ENDDO
312	!
313	!-- Get the size of the parent model
314	IF ( m_my_cpl_id > 1 ) THEN
315	CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size, &
316	istat )
317	ELSE
318	!
319	!-- The root model does not have a parent
320	m_parent_remote_size = -1
321	ENDIF
322	!
323	!-- Set myid to non-zero value except for the root domain. This is a setting
324	!-- for the message routine which is called at the end of pmci_init. That
325	!-- routine outputs messages for myid = 0, only. However, myid has not been
326	!-- assigened so far, so that all processes of the root model would output a
327	!-- message. To avoid this, set myid to some other value except for process 0
328	!-- of the root domain.
329	IF ( m_world_rank /= 0 ) myid = 1
330
331	END SUBROUTINE PMC_init_model
332
333
334
335	SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name, &
336	cpl_parent_id, lower_left_x, lower_left_y, &
337	ncpl, npe_total, request_for_cpl_id )
338	!
339	!-- Provide module private variables of the pmc for PALM
340
341	USE kinds
342
343	IMPLICIT NONE
344
345	CHARACTER(LEN=*), INTENT(OUT), OPTIONAL :: cpl_name !<
346
347	INTEGER, INTENT(IN), OPTIONAL :: request_for_cpl_id !<
348
349	INTEGER, INTENT(OUT), OPTIONAL :: comm_world_nesting !<
350	INTEGER, INTENT(OUT), OPTIONAL :: cpl_id !<
351	INTEGER, INTENT(OUT), OPTIONAL :: cpl_parent_id !<
352	INTEGER, INTENT(OUT), OPTIONAL :: ncpl !<
353	INTEGER, INTENT(OUT), OPTIONAL :: npe_total !<
354
355	INTEGER :: requested_cpl_id !<
356
357	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_x !<
358	REAL(wp), INTENT(OUT), OPTIONAL :: lower_left_y !<
359
360	!
361	!-- Set the requested coupler id
362	IF ( PRESENT( request_for_cpl_id ) ) THEN
363	requested_cpl_id = request_for_cpl_id
364	!
365	!-- Check for allowed range of values
366	IF ( requested_cpl_id < 1 .OR. requested_cpl_id > m_ncpl ) RETURN
367	ELSE
368	requested_cpl_id = m_my_cpl_id
369	ENDIF
370	!
371	!-- Return the requested information
372	IF ( PRESENT( comm_world_nesting ) ) THEN
373	comm_world_nesting = m_world_comm
374	ENDIF
375	IF ( PRESENT( cpl_id ) ) THEN
376	cpl_id = requested_cpl_id
377	ENDIF
378	IF ( PRESENT( cpl_parent_id ) ) THEN
379	cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
380	ENDIF
381	IF ( PRESENT( cpl_name ) ) THEN
382	cpl_name = m_couplers(requested_cpl_id)%name
383	ENDIF
384	IF ( PRESENT( ncpl ) ) THEN
385	ncpl = m_ncpl
386	ENDIF
387	IF ( PRESENT( npe_total ) ) THEN
388	npe_total = m_couplers(requested_cpl_id)%npe_total
389	ENDIF
390	IF ( PRESENT( lower_left_x ) ) THEN
391	lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
392	ENDIF
393	IF ( PRESENT( lower_left_y ) ) THEN
394	lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
395	ENDIF
396
397	END SUBROUTINE pmc_get_model_info
398
399
400
401	LOGICAL function pmc_is_rootmodel( )
402
403	IMPLICIT NONE
404
405	pmc_is_rootmodel = ( m_my_cpl_id == 1 )
406
407	END FUNCTION pmc_is_rootmodel
408
409
410
411	SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode, &
412	anterpolation_buffer_width, pmc_status )
413
414	IMPLICIT NONE
415
416	CHARACTER(LEN=8), INTENT(INOUT) :: nesting_mode
417	CHARACTER(LEN=7), INTENT(INOUT) :: nesting_datatransfer_mode
418
419	INTEGER, INTENT(INOUT) :: anterpolation_buffer_width !< Boundary buffer width for anterpolation
420	INTEGER(iwp), INTENT(INOUT) :: pmc_status
421	INTEGER(iwp) :: bad_llcorner
422	INTEGER(iwp) :: i
423	INTEGER(iwp) :: istat
424
425	TYPE(pmc_layout), DIMENSION(pmc_max_models) :: domain_layouts
426
427	NAMELIST /nesting_parameters/ domain_layouts, nesting_datatransfer_mode, &
428	nesting_mode, anterpolation_buffer_width
429
430	!
431	!-- Initialize some coupling variables
432	domain_layouts(1:pmc_max_models)%id = -1
433	m_ncpl = 0
434
435	pmc_status = pmc_status_ok
436	!
437	!-- Open the NAMELIST-file and read the nesting layout
438	CALL check_open( 11 )
439	READ ( 11, nesting_parameters, IOSTAT=istat )
440	!
441	!-- Set filepointer to the beginning of the file. Otherwise process 0 will later
442	!-- be unable to read the inipar-NAMELIST
443	REWIND ( 11 )
444
445	IF ( istat < 0 ) THEN
446	!
447	!-- No nesting_parameters-NAMELIST found
448	pmc_status = pmc_no_namelist_found
449	RETURN
450	ELSEIF ( istat > 0 ) THEN
451	!
452	!-- Errors in reading nesting_parameters-NAMELIST
453	pmc_status = pmc_namelist_error
454	RETURN
455	ENDIF
456	!
457	!-- Output location message
458	CALL location_message( 'initialize communicators for nesting', 'start' )
459	!
460	!-- Assign the layout to the corresponding internally used variable m_couplers
461	m_couplers = domain_layouts
462	!
463	!-- Get the number of nested models given in the nesting_parameters-NAMELIST
464	DO i = 1, pmc_max_models
465	!
466	!-- When id=-1 is found for the first time, the list of domains is finished
467	IF ( m_couplers(i)%id == -1 .OR. i == pmc_max_models ) THEN
468	IF ( m_couplers(i)%id == -1 ) THEN
469	m_ncpl = i - 1
470	EXIT
471	ELSE
472	m_ncpl = pmc_max_models
473	ENDIF
474	ENDIF
475	ENDDO
476	!
477	!-- Make sure that all domains have equal lower left corner in case of vertical
478	!-- nesting
479	IF ( nesting_mode == 'vertical' ) THEN
480	bad_llcorner = 0
481	DO i = 1, m_ncpl
482	IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR. &
483	domain_layouts(i)%lower_left_y /= 0.0_wp ) THEN
484	bad_llcorner = bad_llcorner + 1
485	domain_layouts(i)%lower_left_x = 0.0_wp
486	domain_layouts(i)%lower_left_y = 0.0_wp
487	ENDIF
488	ENDDO
489	IF ( bad_llcorner /= 0) THEN
490	WRITE ( message_string, *) 'at least one dimension of lower ', &
491	'left corner of one domain is not 0. ', &
492	'All lower left corners were set to (0, 0)'
493	CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
494	ENDIF
495	ENDIF
496
497	CALL location_message( 'initialize communicators for nesting', 'finished' )
498
499	END SUBROUTINE read_coupling_layout
500
501	#endif
502	END MODULE pmc_handle_communicator

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