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source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 2601

Last change on this file since 2601 was 2599, checked in by hellstea, 7 years ago
i/o grouping update for nested runs
Property svn:keywords set to `Id`
File size: 18.9 KB

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

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