source: palm/trunk/SOURCE/pmc_handle_communicator_mod.f90 @ 3819

Last change on this file since 3819 was 3819, checked in by hellstea, 2 years ago

Adjustable anterpolation buffer introduced on all nest boundaries

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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 3819 2019-03-27 11:01:36Z hellstea $
27! Adjustable anterpolation buffer introduced on all nest boundaries, it is controlled
28! by the new nesting_parameters parameter anterpolation_buffer_width.
29!
30! 3655 2019-01-07 16:51:22Z knoop
31! nestpar renamed to nesting_parameters
32!
33! 2841 2018-02-27 15:02:57Z knoop
34! Bugfix: wrong placement of include 'mpif.h' corrected
35!
36! 2801 2018-02-14 16:01:55Z thiele
37! Introduce particle transfer in nested models.
38!
39! 2718 2018-01-02 08:49:38Z maronga
40! Corrected "Former revisions" section
41!
42! 2696 2017-12-14 17:12:51Z kanani
43! Change in file header (GPL part)
44! Bugfix, give Intent(inout) attributes in routine reading nestpar-namelist (MS)
45!
46! 2599 2017-11-01 13:18:45Z hellstea
47! Separate peer communicator peer_comm introduced for MPI_INTERCOMM_CREATE.
48! Some cleanup and commenting improvements.
49!
50! 2516 2017-10-04 11:03:04Z suehring
51! Remove tabs
52!
53! 2514 2017-10-04 09:52:37Z suehring
54! Bugfix, set filepointer to the beginning of the file after namelist read,
55! in order to assure that further namelists are also found.
56!
57! 2279 2017-06-12 15:23:44Z suehring
58! Error message text changed
59!
60! 2101 2017-01-05 16:42:31Z suehring
61!
62! 2013 2016-09-21 13:07:56Z suehring
63! Bugfix in format descriptor
64!
65! 2000 2016-08-20 18:09:15Z knoop
66! Forced header and separation lines into 80 columns
67!
68! 1938 2016-06-13 15:26:05Z hellstea
69! Minor clean-up.
70!
71! 1901 2016-05-04 15:39:38Z raasch
72! Initial version of purely vertical nesting introduced.
73! Code clean up. The words server/client changed to parent/child.
74!
75! 1900 2016-05-04 15:27:53Z raasch
76! re-formatting to match PALM style
77!
78! 1882 2016-04-20 15:24:46Z hellstea
79! MPI_BCAST-calls to broadcast nesting_mode and nesting_datatransfer_mode
80! are moved out from the DO i = 1, m_ncpl loop.
81!
82! 1850 2016-04-08 13:29:27Z maronga
83! Module renamed
84!
85! 1808 2016-04-05 19:44:00Z raasch
86! MPI module used by default on all machines
87!
88! 1797 2016-03-21 16:50:28Z raasch
89! introduction of different datatransfer modes,
90! export of comm_world_nesting
91!
92! 1791 2016-03-11 10:41:25Z raasch
93! m_nrofcpl renamed m_ncpl,
94! pmc_get_local_model_info renamed pmc_get_model_info, some keywords also
95! renamed and some added,
96! debug write-statements commented out
97!
98! 1786 2016-03-08 05:49:27Z raasch
99! Bugfix: nesting_mode is broadcast now
100!
101! 1779 2016-03-03 08:01:28Z raasch
102! only the total number of PEs is given in the nestpar-NAMELIST,
103! additional comments included
104!
105! 1764 2016-02-28 12:45:19Z raasch
106! pmc_layout type: comm_cpl and comm_parent removed, character "name" moved at
107! the beginning of the variable list,
108! domain layout is read with new NAMELIST nestpar from standard file PARIN,
109! MPI-datatype REAL8 replaced by REAL, kind=8 replaced by wp,
110! variable domain_layouts instead of m_couplers introduced for this NAMELIST,
111! general format changed to PALM style
112!
113! 1762 2016-02-25 12:31:13Z hellstea
114! Initial revision by K. Ketelsen
115!
116! Description:
117! ------------
118! Handle MPI communicator in PALM model coupler
119!-------------------------------------------------------------------------------!
120 MODULE PMC_handle_communicator
121#if defined( __parallel )
122    USE kinds
123
124#if !defined( __mpifh )
125    USE MPI
126#endif
127
128    USE pmc_general,                                                            &
129        ONLY: pmc_status_ok, pmc_status_error, pmc_max_models
130    USE control_parameters,                                                     &
131        ONLY: message_string
132
133    IMPLICIT NONE
134
135#if defined( __mpifh )
136    INCLUDE "mpif.h"
137#endif
138
139    TYPE pmc_layout
140
141       CHARACTER(LEN=32) ::  name
142
143       INTEGER  ::  id            !<
144       INTEGER  ::  parent_id     !<
145       INTEGER  ::  npe_total     !<
146
147       REAL(wp) ::  lower_left_x  !<
148       REAL(wp) ::  lower_left_y  !<
149
150    END TYPE pmc_layout
151
152    PUBLIC  pmc_status_ok, pmc_status_error
153
154    INTEGER, PARAMETER, PUBLIC ::  pmc_error_npes        = 1  !< illegal number of processes
155    INTEGER, PARAMETER, PUBLIC ::  pmc_namelist_error    = 2  !< error(s) in nesting_parameters namelist
156    INTEGER, PARAMETER, PUBLIC ::  pmc_no_namelist_found = 3  !< no couple layout namelist found
157
158    INTEGER ::  m_world_comm  !< global nesting communicator
159    INTEGER ::  m_my_cpl_id   !< coupler id of this model
160    INTEGER ::  m_parent_id   !< coupler id of parent of this model
161    INTEGER ::  m_ncpl        !< number of couplers given in nesting_parameters namelist
162
163    TYPE(pmc_layout), PUBLIC, DIMENSION(pmc_max_models) ::  m_couplers  !< information of all couplers
164
165    INTEGER, PUBLIC ::  m_model_comm          !< communicator of this model
166    INTEGER, PUBLIC ::  m_to_parent_comm      !< communicator to the parent
167    INTEGER, PUBLIC ::  m_world_rank          !<
168    INTEGER         ::  m_world_npes          !<
169    INTEGER, PUBLIC ::  m_model_rank          !<
170    INTEGER, PUBLIC ::  m_model_npes          !<
171    INTEGER         ::  m_parent_remote_size  !< number of processes in the parent model
172    INTEGER         ::  peer_comm             !< peer_communicator for inter communicators
173
174    INTEGER, DIMENSION(pmc_max_models), PUBLIC ::  m_to_child_comm    !< communicator to the child(ren)
175    INTEGER, DIMENSION(:), POINTER, PUBLIC ::  pmc_parent_for_child   !<
176
177
178    INTERFACE pmc_is_rootmodel
179       MODULE PROCEDURE pmc_is_rootmodel
180    END INTERFACE pmc_is_rootmodel
181
182    INTERFACE pmc_get_model_info
183       MODULE PROCEDURE pmc_get_model_info
184    END INTERFACE pmc_get_model_info
185
186    PUBLIC pmc_get_model_info, pmc_init_model, pmc_is_rootmodel
187
188 CONTAINS
189
190 SUBROUTINE pmc_init_model( comm, nesting_datatransfer_mode, nesting_mode,      &
191                            anterpolation_buffer_width, pmc_status )
192
193    USE control_parameters,                                                     &
194        ONLY:  message_string
195
196    USE pegrid,                                                                 &
197        ONLY:  myid
198
199      IMPLICIT NONE
200
201    CHARACTER(LEN=8), INTENT(INOUT) ::  nesting_mode               !<
202    CHARACTER(LEN=7), INTENT(INOUT) ::  nesting_datatransfer_mode  !<
203
204    INTEGER, INTENT(INOUT) ::  anterpolation_buffer_width          !< Boundary buffer width for anterpolation
205    INTEGER, INTENT(INOUT) ::  comm        !<
206    INTEGER, INTENT(INOUT) ::  pmc_status  !<
207
208    INTEGER ::  childcount     !<
209    INTEGER ::  i              !<
210    INTEGER ::  ierr           !<
211    INTEGER ::  istat          !<
212    INTEGER ::  m_my_cpl_rank  !<
213    INTEGER ::  tag            !<
214
215    INTEGER, DIMENSION(pmc_max_models)   ::  activeparent  ! I am active parent for this child ID
216    INTEGER, DIMENSION(pmc_max_models+1) ::  start_pe
217
218    pmc_status   = pmc_status_ok
219    comm         = -1
220    m_world_comm = MPI_COMM_WORLD
221    m_my_cpl_id  = -1
222    childcount   =  0
223    activeparent = -1
224    start_pe(:)  =  0
225
226    CALL MPI_COMM_RANK( MPI_COMM_WORLD, m_world_rank, istat )
227    CALL MPI_COMM_SIZE( MPI_COMM_WORLD, m_world_npes, istat )
228!
229!-- Only process 0 of root model reads
230    IF ( m_world_rank == 0 )  THEN
231
232       CALL read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
233                                  anterpolation_buffer_width, pmc_status )
234
235       IF ( pmc_status /= pmc_no_namelist_found  .AND.                          &
236            pmc_status /= pmc_namelist_error )                                  &
237       THEN
238!
239!--       Calculate start PE of every model
240          start_pe(1) = 0
241          DO  i = 2, m_ncpl+1
242             start_pe(i) = start_pe(i-1) + m_couplers(i-1)%npe_total
243          ENDDO
244
245!
246!--       The sum of numbers of processes requested by all the domains
247!--       must be equal to the total number of processes of the run
248          IF ( start_pe(m_ncpl+1) /= m_world_npes )  THEN
249             WRITE ( message_string, '(2A,I6,2A,I6,A)' )                        &
250                             'nesting-setup requires different number of ',     &
251                             'MPI procs (', start_pe(m_ncpl+1), ') than ',      &
252                             'provided (', m_world_npes,')'
253             CALL message( 'pmc_init_model', 'PA0229', 3, 2, 0, 6, 0 )
254          ENDIF
255
256       ENDIF
257
258    ENDIF
259!
260!-- Broadcast the read status. This synchronises all other processes with
261!-- process 0 of the root model. Without synchronisation, they would not
262!-- behave in the correct way (e.g. they would not return in case of a
263!-- missing NAMELIST).
264    CALL MPI_BCAST( pmc_status, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
265
266    IF ( pmc_status == pmc_no_namelist_found )  THEN
267!
268!--    Not a nested run; return the MPI_WORLD communicator
269       comm = MPI_COMM_WORLD
270       RETURN
271
272    ELSEIF ( pmc_status == pmc_namelist_error )  THEN
273!
274!--    Only the root model gives the error message. Others are aborted by the
275!--    message-routine with MPI_ABORT. Must be done this way since myid and
276!--    comm2d have not yet been assigned at this point.
277       IF ( m_world_rank == 0 )  THEN
278          message_string = 'errors in \$nesting_parameters'
279          CALL message( 'pmc_init_model', 'PA0223', 3, 2, 0, 6, 0 )
280       ENDIF
281
282    ENDIF
283
284    CALL MPI_BCAST( m_ncpl,          1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
285    CALL MPI_BCAST( start_pe, m_ncpl+1, MPI_INTEGER, 0, MPI_COMM_WORLD, istat )
286!
287!-- Broadcast coupling layout
288    DO  i = 1, m_ncpl
289       CALL MPI_BCAST( m_couplers(i)%name, LEN( m_couplers(i)%name ),           &
290                       MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
291       CALL MPI_BCAST( m_couplers(i)%id,           1, MPI_INTEGER, 0,           &
292                       MPI_COMM_WORLD, istat )
293       CALL MPI_BCAST( m_couplers(i)%Parent_id,    1, MPI_INTEGER, 0,           &
294                       MPI_COMM_WORLD, istat )
295       CALL MPI_BCAST( m_couplers(i)%npe_total,    1, MPI_INTEGER, 0,           &
296                       MPI_COMM_WORLD, istat )
297       CALL MPI_BCAST( m_couplers(i)%lower_left_x, 1, MPI_REAL,    0,           &
298                       MPI_COMM_WORLD, istat )
299       CALL MPI_BCAST( m_couplers(i)%lower_left_y, 1, MPI_REAL,    0,           &
300                       MPI_COMM_WORLD, istat )
301    ENDDO
302    CALL MPI_BCAST( nesting_mode, LEN( nesting_mode ), MPI_CHARACTER, 0,        &
303                    MPI_COMM_WORLD, istat )
304    CALL MPI_BCAST( nesting_datatransfer_mode, LEN(nesting_datatransfer_mode),  &
305                    MPI_CHARACTER, 0, MPI_COMM_WORLD, istat )
306!
307!-- Assign global MPI processes to individual models by setting the couple id
308    DO  i = 1, m_ncpl
309       IF ( m_world_rank >= start_pe(i)  .AND.  m_world_rank < start_pe(i+1) )  &
310       THEN
311          m_my_cpl_id = i
312          EXIT
313       ENDIF
314    ENDDO
315    m_my_cpl_rank = m_world_rank - start_pe(i)
316!
317!-- MPI_COMM_WORLD is the communicator for ALL models (MPI-1 approach).
318!-- The communictors for the individual models as created by MPI_COMM_SPLIT.
319!-- The color of the model is represented by the coupler id
320    CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, m_my_cpl_id, m_my_cpl_rank, comm,      &
321                         istat )
322!
323!-- Get size and rank of the model running on this process
324    CALL  MPI_COMM_RANK( comm, m_model_rank, istat )
325    CALL  MPI_COMM_SIZE( comm, m_model_npes, istat )
326!
327!-- Broadcast (from process 0) the parent id and id of every model
328    DO  i = 1, m_ncpl
329       CALL MPI_BCAST( m_couplers(i)%parent_id, 1, MPI_INTEGER, 0,              &
330                       MPI_COMM_WORLD, istat )
331       CALL MPI_BCAST( m_couplers(i)%id,        1, MPI_INTEGER, 0,              &
332                       MPI_COMM_WORLD, istat )
333    ENDDO
334!
335!-- Save the current model communicator for pmc internal use
336    m_model_comm = comm
337
338!
339!-- Create intercommunicator between the parent and children.
340!-- MPI_INTERCOMM_CREATE creates an intercommunicator between 2 groups of
341!-- different colors.
342!-- The grouping was done above with MPI_COMM_SPLIT.
343!-- A duplicate of MPI_COMM_WORLD is created and used as peer communicator
344!-- (peer_comm) for MPI_INTERCOMM_CREATE.
345    CALL MPI_COMM_DUP( MPI_COMM_WORLD, peer_comm, ierr ) 
346    DO  i = 2, m_ncpl
347       IF ( m_couplers(i)%parent_id == m_my_cpl_id )  THEN
348!
349!--       Identify all children models of the current model and create
350!--       inter-communicators to connect between the current model and its
351!--       children models.
352          tag = 500 + i
353          CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm, start_pe(i),           &
354                                     tag, m_to_child_comm(i), istat)
355          childcount = childcount + 1
356          activeparent(i) = 1
357       ELSEIF ( i == m_my_cpl_id)  THEN
358!
359!--       Create an inter-communicator to connect between the current
360!--       model and its parent model.   
361          tag = 500 + i
362          CALL MPI_INTERCOMM_CREATE( comm, 0, peer_comm,                        &
363                                     start_pe(m_couplers(i)%parent_id),         &
364                                     tag, m_to_parent_comm, istat )
365       ENDIF
366    ENDDO
367!
368!-- If I am a parent, count the number of children I have.
369!-- Although this loop is symmetric on all processes, the "activeparent" flag
370!-- is true (==1) on the respective individual process only.
371    ALLOCATE( pmc_parent_for_child(childcount+1) )
372
373    childcount = 0
374    DO  i = 2, m_ncpl
375       IF ( activeparent(i) == 1 )  THEN
376          childcount = childcount + 1
377          pmc_parent_for_child(childcount) = i
378       ENDIF
379    ENDDO
380!
381!-- Get the size of the parent model
382    IF ( m_my_cpl_id > 1 )  THEN
383       CALL MPI_COMM_REMOTE_SIZE( m_to_parent_comm, m_parent_remote_size,       &
384                                  istat )
385    ELSE
386!
387!--    The root model does not have a parent
388       m_parent_remote_size = -1
389    ENDIF
390!
391!-- Set myid to non-zero value except for the root domain. This is a setting
392!-- for the message routine which is called at the end of pmci_init. That
393!-- routine outputs messages for myid = 0, only. However, myid has not been
394!-- assigened so far, so that all processes of the root model would output a
395!-- message. To avoid this, set myid to some other value except for process 0
396!-- of the root domain.
397    IF ( m_world_rank /= 0 )  myid = 1
398
399 END SUBROUTINE PMC_init_model
400
401
402
403 SUBROUTINE pmc_get_model_info( comm_world_nesting, cpl_id, cpl_name,           &
404                                cpl_parent_id, lower_left_x, lower_left_y,      &
405                                ncpl, npe_total, request_for_cpl_id )
406!
407!-- Provide module private variables of the pmc for PALM
408
409    USE kinds
410
411    IMPLICIT NONE
412
413    CHARACTER(LEN=*), INTENT(OUT), OPTIONAL ::  cpl_name   !<
414
415    INTEGER, INTENT(IN), OPTIONAL ::  request_for_cpl_id   !<
416
417    INTEGER, INTENT(OUT), OPTIONAL ::  comm_world_nesting  !<
418    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_id              !<
419    INTEGER, INTENT(OUT), OPTIONAL ::  cpl_parent_id       !<
420    INTEGER, INTENT(OUT), OPTIONAL ::  ncpl                !<
421    INTEGER, INTENT(OUT), OPTIONAL ::  npe_total           !<
422
423    INTEGER ::  requested_cpl_id                           !<
424
425    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_x       !<
426    REAL(wp), INTENT(OUT), OPTIONAL ::  lower_left_y       !<
427
428!
429!-- Set the requested coupler id
430    IF ( PRESENT( request_for_cpl_id ) )  THEN
431       requested_cpl_id = request_for_cpl_id
432!
433!--    Check for allowed range of values
434       IF ( requested_cpl_id < 1  .OR.  requested_cpl_id > m_ncpl )  RETURN
435    ELSE
436       requested_cpl_id = m_my_cpl_id
437    ENDIF
438!
439!-- Return the requested information
440    IF ( PRESENT( comm_world_nesting )  )  THEN
441       comm_world_nesting = m_world_comm
442    ENDIF
443    IF ( PRESENT( cpl_id )        )  THEN
444       cpl_id = requested_cpl_id
445    ENDIF
446    IF ( PRESENT( cpl_parent_id ) )  THEN
447       cpl_parent_id = m_couplers(requested_cpl_id)%parent_id
448    ENDIF
449    IF ( PRESENT( cpl_name )      )  THEN
450       cpl_name = m_couplers(requested_cpl_id)%name
451    ENDIF
452    IF ( PRESENT( ncpl )          )  THEN
453       ncpl = m_ncpl
454    ENDIF
455    IF ( PRESENT( npe_total )     )  THEN
456       npe_total = m_couplers(requested_cpl_id)%npe_total
457    ENDIF
458    IF ( PRESENT( lower_left_x )  )  THEN
459       lower_left_x = m_couplers(requested_cpl_id)%lower_left_x
460    ENDIF
461    IF ( PRESENT( lower_left_y )  )  THEN
462       lower_left_y = m_couplers(requested_cpl_id)%lower_left_y
463    ENDIF
464
465 END SUBROUTINE pmc_get_model_info
466
467
468
469 LOGICAL function pmc_is_rootmodel( )
470
471    IMPLICIT NONE
472
473    pmc_is_rootmodel = ( m_my_cpl_id == 1 )
474
475 END FUNCTION pmc_is_rootmodel
476
477
478
479 SUBROUTINE read_coupling_layout( nesting_datatransfer_mode, nesting_mode,      &
480      anterpolation_buffer_width, pmc_status )
481
482    IMPLICIT NONE
483
484    CHARACTER(LEN=8), INTENT(INOUT) ::  nesting_mode
485    CHARACTER(LEN=7), INTENT(INOUT) ::  nesting_datatransfer_mode
486   
487    INTEGER, INTENT(INOUT)      ::  anterpolation_buffer_width     !< Boundary buffer width for anterpolation
488    INTEGER(iwp), INTENT(INOUT) ::  pmc_status
489    INTEGER(iwp)                ::  bad_llcorner
490    INTEGER(iwp)                ::  i
491    INTEGER(iwp)                ::  istat
492
493    TYPE(pmc_layout), DIMENSION(pmc_max_models) ::  domain_layouts
494
495    NAMELIST /nesting_parameters/  domain_layouts, nesting_datatransfer_mode,  &
496                                   nesting_mode, anterpolation_buffer_width
497   
498!
499!-- Initialize some coupling variables
500    domain_layouts(1:pmc_max_models)%id = -1
501    m_ncpl =   0
502
503    pmc_status = pmc_status_ok
504!
505!-- Open the NAMELIST-file and read the nesting layout
506    CALL check_open( 11 )
507    READ ( 11, nesting_parameters, IOSTAT=istat )
508!
509!-- Set filepointer to the beginning of the file. Otherwise process 0 will later
510!-- be unable to read the inipar-NAMELIST
511    REWIND ( 11 )
512
513    IF ( istat < 0 )  THEN
514!
515!--    No nesting_parameters-NAMELIST found
516       pmc_status = pmc_no_namelist_found
517       RETURN
518    ELSEIF ( istat > 0 )  THEN
519!
520!--    Errors in reading nesting_parameters-NAMELIST
521       pmc_status = pmc_namelist_error
522       RETURN
523    ENDIF
524!
525!-- Output location message
526    CALL location_message( 'initialize communicators for nesting', .FALSE. )
527!
528!-- Assign the layout to the corresponding internally used variable m_couplers
529    m_couplers = domain_layouts
530!
531!-- Get the number of nested models given in the nesting_parameters-NAMELIST
532    DO  i = 1, pmc_max_models
533!
534!--    When id=-1 is found for the first time, the list of domains is finished
535       IF ( m_couplers(i)%id == -1  .OR.  i == pmc_max_models )  THEN
536          IF ( m_couplers(i)%id == -1 )  THEN
537             m_ncpl = i - 1
538             EXIT
539          ELSE
540             m_ncpl = pmc_max_models
541          ENDIF
542       ENDIF
543    ENDDO
544!
545!-- Make sure that all domains have equal lower left corner in case of vertical
546!-- nesting
547    IF ( nesting_mode == 'vertical' )  THEN
548       bad_llcorner = 0
549       DO  i = 1, m_ncpl
550          IF ( domain_layouts(i)%lower_left_x /= 0.0_wp .OR.                    &
551               domain_layouts(i)%lower_left_y /= 0.0_wp )  THEN
552             bad_llcorner = bad_llcorner + 1
553             domain_layouts(i)%lower_left_x = 0.0_wp
554             domain_layouts(i)%lower_left_y = 0.0_wp
555          ENDIF
556       ENDDO
557       IF ( bad_llcorner /= 0)  THEN
558          WRITE ( message_string, *)  'at least one dimension of lower ',       &
559                                      'left corner of one domain is not 0. ',   &
560                                      'All lower left corners were set to (0, 0)'
561          CALL message( 'read_coupling_layout', 'PA0427', 0, 0, 0, 6, 0 )
562       ENDIF
563    ENDIF
564
565 END SUBROUTINE read_coupling_layout
566
567#endif
568 END MODULE pmc_handle_communicator
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