source: palm/trunk/SOURCE/palm.f90 @ 3994

Last change on this file since 3994 was 3994, checked in by suehring, 2 years ago

new module for diagnostic output quantities added + output of turbulence intensity

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1!> @file palm.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: palm.f90 3994 2019-05-22 18:08:09Z suehring $
27! new module for calculation and output of diagnostic quantities added
28!
29! 3885 2019-04-11 11:29:34Z kanani
30! Changes related to global restructuring of location messages and introduction
31! of additional debug messages
32!
33! 3761 2019-02-25 15:31:42Z raasch
34! unused variable removed
35!
36! 3719 2019-02-06 13:10:18Z kanani
37! Included cpu measurement for wall/soil spinup
38!
39! 3703 2019-01-29 16:43:53Z knoop
40! Some interface calls moved to module_interface + cleanup
41!
42! 3648 2019-01-02 16:35:46Z suehring
43! Rename subroutines for surface-data output
44!
45! 3524 2018-11-14 13:36:44Z raasch
46! unused variable removed
47!
48! 3494 2018-11-06 14:51:27Z suehring
49! Last actions for surface output added
50!
51! 3487 2018-11-05 07:18:02Z maronga
52! Updates version to 6.0
53!
54! 3484 2018-11-02 14:41:25Z hellstea
55! pmci_ensure_nest_mass_conservation removed permanently
56!
57! 3458 2018-10-30 14:51:23Z kanani
58! from chemistry branch r3443, forkel:
59! removed double do_emis check around CALL chem_init
60! replaced call to calc_date_and_time to init_date_and_time
61!
62! 3337 2018-10-12 15:17:09Z kanani
63! (from branch resler)
64! Fix chemistry call
65!
66! 3298 2018-10-02 12:21:11Z kanani
67! - Minor formatting (kanani)
68! - Added Call of date_and_time_init (Russo)
69! - Added Call of calc_date_and_time before call of init_3d where emissions
70!   are initialized:
71!   we have to know the time indices to initialize emission values (Russo)
72! - Added Call of netcdf_data_input_chemistry_data (Russo)
73!
74! 3274 2018-09-24 15:42:55Z knoop
75! Modularization of all bulk cloud physics code components
76!
77! 3258 2018-09-18 07:23:31Z Giersch
78! current revision for user interface has been changed to 3240
79!
80! 3241 2018-09-12 15:02:00Z raasch
81! unused variables removed
82!
83! 3235 2018-09-07 14:06:15Z sward
84! Added mas_last_actions call and multi_agent_system_mod dependency
85!
86! 3232 2018-09-07 12:21:44Z raasch
87! references to mrun replaced by palmrun, and updated
88!
89! 3182 2018-07-27 13:36:03Z suehring
90! Deduct spinup_time from RUN_CONTROL output of main 3d run
91! (use time_since_reference_point instead of simulated_time)
92!
93! 2951 2018-04-06 09:05:08Z kanani
94! Add log_point_s for pmci_init
95!
96! 2903 2018-03-16 08:17:06Z hellstea
97! Nesting-related calls to pmci_ensure_nest_mass_conservation and pres after
98! the nest initialization are removed as they may create unwanted initial
99! perturbation in some cases.
100!
101! 2894 2018-03-15 09:17:58Z Giersch
102! Modified todo list, _write_restart_data/_last_actions has been renamed to
103! _wrd_local, unit 14 will be opened now for each io_group
104! write_3d_binary is called wrd_local now, wrd_global moved from wrd_local to
105! palm.f90, unit 14 is closed directly after the wrd_local call, Module related
106! routines for writing restart data have been moved to wrd_local
107!
108! 2801 2018-02-14 16:01:55Z suehring
109! Changed lpm from subroutine to module.
110! Introduce particle transfer in nested models.
111!
112! 2766 2018-01-22 17:17:47Z kanani
113! Removed preprocessor directive __chem
114!
115! 2720 2018-01-02 16:27:15Z kanani
116! Version update to 5.0
117!
118! 2718 2018-01-02 08:49:38Z maronga
119! Corrected "Former revisions" section
120!
121! 2696 2017-12-14 17:12:51Z kanani
122! Change in file header (GPL part)
123! Implementation of chemistry module (FK)
124! Introduce input-data standard
125! Rename lsm_last_actions into lsm_write_restart_data
126! Move usm_write_restart_data into io_blocks loop (MS)
127!
128! 2512 2017-10-04 08:26:59Z raasch
129! user interface required revision updated
130!
131! 2320 2017-07-21 12:47:43Z suehring
132! Modularize large-scale forcing and nudging
133!
134! 2298 2017-06-29 09:28:18Z raasch
135! type of write_binary changed from CHARACTER to LOGICAL,
136! user interface required revision updated, MPI2 related part removed
137!
138! 2296 2017-06-28 07:53:56Z maronga
139! Added call to new spinup routine
140!
141! 2292 2017-06-20 09:51:42Z schwenkel
142! Implementation of new microphysic scheme: cloud_scheme = 'morrison'
143! includes two more prognostic equations for cloud drop concentration (nc) 
144! and cloud water content (qc).
145!
146! 2261 2017-06-08 14:25:57Z raasch
147! output of run number for mrun to create unified cycle numbers
148!
149! 2233 2017-05-30 18:08:54Z suehring
150!
151! 2232 2017-05-30 17:47:52Z suehring
152! Renamed wall_flags_0 and wall_flags_00 into advc_flags_1 and advc_flags_2,
153! respectively, within copyin statement. Moreover, introduced further flag
154! array wall_flags_0.
155! Remove unused variables from ONLY list.
156!
157! 2178 2017-03-17 11:07:39Z hellstea
158! Calls for pmci_ensure_nest_mass_conservation and pres are added after
159! the nest initialization
160!
161! 2118 2017-01-17 16:38:49Z raasch
162! OpenACC directives and related code removed
163!
164! 2011 2016-09-19 17:29:57Z kanani
165! Flag urban_surface is now defined in module control_parameters.
166!
167! 2007 2016-08-24 15:47:17Z kanani
168! Temporarily added CALL for writing of restart data for urban surface model
169!
170! 2000 2016-08-20 18:09:15Z knoop
171! Forced header and separation lines into 80 columns
172!
173! 1976 2016-07-27 13:28:04Z maronga
174! Added call to radiation_last_actions for binary output of land surface model
175! data
176!
177! 1972 2016-07-26 07:52:02Z maronga
178! Added call to lsm_last_actions for binary output of land surface model data
179!
180! 1960 2016-07-12 16:34:24Z suehring
181! Separate humidity and passive scalar
182!
183! 1834 2016-04-07 14:34:20Z raasch
184! Initial version of purely vertical nesting introduced.
185!
186! 1833 2016-04-07 14:23:03Z raasch
187! required user interface version changed
188!
189! 1808 2016-04-05 19:44:00Z raasch
190! routine local_flush replaced by FORTRAN statement
191!
192! 1783 2016-03-06 18:36:17Z raasch
193! required user interface version changed
194!
195! 1781 2016-03-03 15:12:23Z raasch
196! pmc initialization moved from time_integration to here
197!
198! 1779 2016-03-03 08:01:28Z raasch
199! setting of nest_domain and coupling_char moved to the pmci
200!
201! 1764 2016-02-28 12:45:19Z raasch
202! cpp-statements for nesting removed, communicator settings cleaned up
203!
204! 1762 2016-02-25 12:31:13Z hellstea
205! Introduction of nested domain feature
206!
207! 1747 2016-02-08 12:25:53Z raasch
208! OpenACC-adjustment for new surface layer parameterization
209!
210! 1682 2015-10-07 23:56:08Z knoop
211! Code annotations made doxygen readable
212!
213! 1668 2015-09-23 13:45:36Z raasch
214! warning replaced by abort in case of failed user interface check
215!
216! 1666 2015-09-23 07:31:10Z raasch
217! check for user's interface version added
218!
219! 1482 2014-10-18 12:34:45Z raasch
220! adjustments for using CUDA-aware OpenMPI
221!
222! 1468 2014-09-24 14:06:57Z maronga
223! Adapted for use on up to 6-digit processor cores
224!
225! 1402 2014-05-09 14:25:13Z raasch
226! location messages added
227!
228! 1374 2014-04-25 12:55:07Z raasch
229! bugfix: various modules added
230!
231! 1320 2014-03-20 08:40:49Z raasch
232! ONLY-attribute added to USE-statements,
233! kind-parameters added to all INTEGER and REAL declaration statements,
234! kinds are defined in new module kinds,
235! old module precision_kind is removed,
236! revision history before 2012 removed,
237! comment fields (!:) to be used for variable explanations added to
238! all variable declaration statements
239!
240! 1318 2014-03-17 13:35:16Z raasch
241! module interfaces removed
242!
243! 1241 2013-10-30 11:36:58Z heinze
244! initialization of nuding and large scale forcing from external file
245!
246! 1221 2013-09-10 08:59:13Z raasch
247! +wall_flags_00, rflags_invers, rflags_s_inner in copyin statement
248!
249! 1212 2013-08-15 08:46:27Z raasch
250! +tri in copyin statement
251!
252! 1179 2013-06-14 05:57:58Z raasch
253! ref_state added to copyin-list
254!
255! 1113 2013-03-10 02:48:14Z raasch
256! openACC statements modified
257!
258! 1111 2013-03-08 23:54:10Z raasch
259! openACC statements updated
260!
261! 1092 2013-02-02 11:24:22Z raasch
262! unused variables removed
263!
264! 1036 2012-10-22 13:43:42Z raasch
265! code put under GPL (PALM 3.9)
266!
267! 1015 2012-09-27 09:23:24Z raasch
268! Version number changed from 3.8 to 3.8a.
269! OpenACC statements added + code changes required for GPU optimization
270!
271! 849 2012-03-15 10:35:09Z raasch
272! write_particles renamed lpm_write_restart_file
273!
274! Revision 1.1  1997/07/24 11:23:35  raasch
275! Initial revision
276!
277!
278! Description:
279! ------------
280!> Large-Eddy Simulation (LES) model for atmospheric and oceanic boundary-layer
281!> flows
282!> see the PALM homepage https://palm-model.org for further information
283!------------------------------------------------------------------------------!
284 PROGRAM palm
285 
286
287    USE arrays_3d
288
289    USE bulk_cloud_model_mod,                                                  &
290        ONLY: bulk_cloud_model, microphysics_morrison, microphysics_seifert
291
292    USE control_parameters,                                                    &
293        ONLY:  constant_diffusion, child_domain,                               &
294               coupling_char, do2d_at_begin, do3d_at_begin, humidity,          &
295               initializing_actions, io_blocks, io_group, message_string,      &
296               neutral, passive_scalar, runnr, simulated_time_chr, spinup,     &
297               time_since_reference_point, user_interface_current_revision,    &
298               user_interface_required_revision, version, write_binary
299
300    USE cpulog,                                                                &
301        ONLY:  cpu_log, log_point, log_point_s, cpu_statistics
302
303    USE date_and_time_mod,                                                     &
304        ONLY:  calc_date_and_time, init_date_and_time
305
306    USE diagnostic_output_quantities_mod,                                      &
307        ONLY:  diagnostic_output_quantities_calculate,                         &
308               timestep_number_at_prev_calc
309
310    USE indices,                                                               &
311        ONLY:  nbgp
312
313    USE kinds
314
315    USE module_interface,                                                      &
316        ONLY:  module_interface_last_actions
317
318    USE multi_agent_system_mod,                                                &
319        ONLY:  agents_active, mas_last_actions
320
321    USE netcdf_data_input_mod,                                                 &
322        ONLY:  netcdf_data_input_inquire_file, netcdf_data_input_init,         &
323               netcdf_data_input_surface_data, netcdf_data_input_topo
324
325    USE particle_attributes,                                                   &
326        ONLY:  particle_advection
327
328    USE pegrid
329
330    USE pmc_particle_interface,                                                &
331        ONLY: pmcp_g_alloc_win
332
333    USE pmc_interface,                                                         &
334        ONLY:  nested_run, pmci_child_initialize, pmci_init,                   &
335               pmci_modelconfiguration, pmci_parent_initialize
336               
337    USE surface_data_output_mod,                                               &
338        ONLY:  surface_data_output_last_action
339
340    USE write_restart_data_mod,                                                &
341        ONLY:  wrd_global, wrd_local
342
343#if defined( __parallel) && defined( _OPENACC )
344    USE openacc
345#endif
346
347
348    IMPLICIT NONE
349
350!
351!-- Local variables
352    CHARACTER(LEN=9) ::  time_to_string  !<
353    INTEGER(iwp)     ::  i               !< loop counter for blocked I/O
354#if defined( __parallel) && defined( _OPENACC )
355    INTEGER(iwp)     :: local_comm       !< local communicator (shared memory)
356    INTEGER(iwp)     :: local_num_procs  !< local number of processes
357    INTEGER(iwp)     :: local_id         !< local id
358    INTEGER(acc_device_kind) :: device_type !< device type for OpenACC
359    INTEGER(iwp)     ::  num_devices     !< number of devices visible to OpenACC
360    INTEGER(iwp)     ::  my_device       !< device used by this process
361#endif
362
363    version = 'PALM 6.0'
364    user_interface_required_revision = 'r3703'
365
366#if defined( __parallel )
367!
368!-- MPI initialisation. comm2d is preliminary set, because
369!-- it will be defined in init_pegrid but is used before in cpu_log.
370    CALL MPI_INIT( ierr )
371
372!
373!-- Initialize the coupling for nested-domain runs
374!-- comm_palm is the communicator which includes all PEs (MPI processes)
375!-- available for this (nested) model. If it is not a nested run, comm_palm
376!-- is returned as MPI_COMM_WORLD
377    CALL cpu_log( log_point_s(70), 'pmci_init', 'start' )
378    CALL pmci_init( comm_palm )
379    CALL cpu_log( log_point_s(70), 'pmci_init', 'stop' )
380    comm2d = comm_palm
381!
382!-- Get the (preliminary) number of MPI processes and the local PE-id (in case
383!-- of a further communicator splitting in init_coupling, these numbers will
384!-- be changed in init_pegrid).
385    IF ( nested_run )  THEN
386
387       CALL MPI_COMM_SIZE( comm_palm, numprocs, ierr )
388       CALL MPI_COMM_RANK( comm_palm, myid, ierr )
389
390    ELSE
391
392       CALL MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr )
393       CALL MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr )
394!
395!--    Initialize PE topology in case of coupled atmosphere-ocean runs (comm_palm
396!--    will be splitted in init_coupling)
397       CALL init_coupling
398    ENDIF
399
400#ifdef _OPENACC
401!
402!-- Select OpenACC device to use in this process. For this find out how many
403!-- neighbors there are running on the same node and which id this process is.
404    IF ( nested_run )  THEN
405       CALL MPI_COMM_SPLIT_TYPE( comm_palm, MPI_COMM_TYPE_SHARED, 0,           &
406                                 MPI_INFO_NULL, local_comm, ierr )
407    ELSE
408       CALL MPI_COMM_SPLIT_TYPE( MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, 0,      &
409                                 MPI_INFO_NULL, local_comm, ierr )
410    ENDIF
411    CALL MPI_COMM_SIZE( local_comm, local_num_procs, ierr )
412    CALL MPI_COMM_RANK( local_comm, local_id, ierr )
413
414!
415!-- This loop including the barrier is a workaround for PGI compiler versions
416!-- up to and including 18.4. Later releases are able to select their GPUs in
417!-- parallel, without running into spurious errors.
418    DO i = 0, local_num_procs-1
419       CALL MPI_BARRIER( local_comm, ierr )
420
421       IF ( i == local_id )  THEN
422          device_type = acc_get_device_type()
423          num_devices = acc_get_num_devices( device_type )
424          my_device = MOD( local_id, num_devices )
425          CALL acc_set_device_num( my_device, device_type )
426       ENDIF
427    ENDDO
428
429    CALL MPI_COMM_FREE( local_comm, ierr )
430#endif
431#endif
432
433!
434!-- Initialize measuring of the CPU-time remaining to the run
435    CALL local_tremain_ini
436
437!
438!-- Start of total CPU time measuring.
439    CALL cpu_log( log_point(1), 'total', 'start' )
440    CALL cpu_log( log_point(2), 'initialisation', 'start' )
441
442!
443!-- Open a file for debug output
444    WRITE (myid_char,'(''_'',I6.6)')  myid
445    OPEN( 9, FILE='DEBUG'//TRIM( coupling_char )//myid_char, FORM='FORMATTED' )
446
447!
448!-- Initialize dvrp logging. Also, one PE maybe split from the global
449!-- communicator for doing the dvrp output. In that case, the number of
450!-- PEs available for PALM is reduced by one and communicator comm_palm
451!-- is changed respectively.
452#if defined( __parallel )
453    CALL MPI_COMM_RANK( comm_palm, myid, ierr )
454#endif
455
456    CALL init_dvrp_logging
457
458!
459!-- Read control parameters from NAMELIST files and read environment-variables
460    CALL parin
461
462!
463!-- Check for the user's interface version
464    IF ( user_interface_current_revision /= user_interface_required_revision )  &
465    THEN
466       message_string = 'current user-interface revision "' //                  &
467                        TRIM( user_interface_current_revision ) // '" does ' // &
468                        'not match the required revision ' //                   &
469                        TRIM( user_interface_required_revision )
470        CALL message( 'palm', 'PA0169', 1, 2, 0, 6, 0 )
471    ENDIF
472
473!
474!-- Determine processor topology and local array indices
475    CALL init_pegrid
476!
477!-- Check if input file according to input-data standard exists
478    CALL netcdf_data_input_inquire_file
479!
480!-- Read topography input data if required. This is required before the
481!-- numerical grid is finally created in init_grid
482    CALL netcdf_data_input_topo 
483!
484!-- Generate grid parameters, initialize generic topography and further process
485!-- topography information if required
486    CALL init_grid
487!
488!-- Read global attributes if available. 
489    CALL netcdf_data_input_init
490!
491!-- Read surface classification data, e.g. vegetation and soil types, water
492!-- surfaces, etc., if available. Some of these data is required before
493!-- check parameters is invoked.     
494    CALL netcdf_data_input_surface_data
495!
496!-- Check control parameters and deduce further quantities
497    CALL check_parameters
498!
499!-- Initial time for chem_emissions_mod
500    CALL init_date_and_time
501
502    CALL init_3d_model
503
504!
505!-- Coupling protocol setup for nested-domain runs
506    IF ( nested_run )  THEN
507       CALL pmci_modelconfiguration
508!
509!--    Receive and interpolate initial data on children.
510!--    Child initialization must be made first if the model is both child and
511!--    parent if necessary
512       IF ( TRIM( initializing_actions ) /= 'read_restart_data' )  THEN
513          CALL pmci_child_initialize
514!
515!--       Send initial condition data from parent to children
516          CALL pmci_parent_initialize
517!
518!--       Exchange_horiz is needed after the nest initialization
519          IF ( child_domain )  THEN
520             CALL exchange_horiz( u, nbgp )
521             CALL exchange_horiz( v, nbgp )
522             CALL exchange_horiz( w, nbgp )
523             IF ( .NOT. neutral )  THEN
524                CALL exchange_horiz( pt, nbgp )
525             ENDIF
526             IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e, nbgp )
527             IF ( humidity )  THEN
528                CALL exchange_horiz( q, nbgp )
529                IF ( bulk_cloud_model  .AND.  microphysics_morrison )  THEN
530                  CALL exchange_horiz( qc, nbgp )
531                  CALL exchange_horiz( nc, nbgp )
532                ENDIF
533                IF ( bulk_cloud_model  .AND.  microphysics_seifert )  THEN
534                   CALL exchange_horiz( qr, nbgp ) 
535                   CALL exchange_horiz( nr, nbgp )
536                ENDIF
537             ENDIF
538             IF ( passive_scalar )  CALL exchange_horiz( s, nbgp )
539          ENDIF
540       ENDIF
541
542       CALL pmcp_g_alloc_win                    ! Must be called after pmci_child_initialize and pmci_parent_initialize
543    ENDIF
544
545!
546!-- Output of program header
547    IF ( myid == 0 )  CALL header
548
549    CALL cpu_log( log_point(2), 'initialisation', 'stop' )
550
551!
552!-- Integration of the non-atmospheric equations (land surface model, urban
553!-- surface model)
554    IF ( spinup )  THEN
555       CALL cpu_log( log_point(41), 'wall/soil spinup', 'start' )
556       CALL time_integration_spinup
557       CALL cpu_log( log_point(41), 'wall/soil spinup', 'stop' )
558    ENDIF
559
560!
561!-- Set start time in format hh:mm:ss
562    simulated_time_chr = time_to_string( time_since_reference_point )
563
564!
565!-- If required, output of initial arrays
566    IF ( do2d_at_begin )  THEN
567       CALL diagnostic_output_quantities_calculate    !TODO, will be called twice
568
569       CALL data_output_2d( 'xy', 0 )
570       CALL data_output_2d( 'xz', 0 )
571       CALL data_output_2d( 'yz', 0 )
572    ENDIF
573
574    IF ( do3d_at_begin )  THEN
575       CALL diagnostic_output_quantities_calculate    !TODO, will be called twice
576
577       CALL data_output_3d( 0 )
578    ENDIF
579
580!
581!-- Integration of the model equations using timestep-scheme
582    CALL time_integration
583
584!
585!-- If required, write binary data for restart runs
586    IF ( write_binary )  THEN
587
588       CALL cpu_log( log_point(22), 'wrd_local', 'start' )
589
590       CALL location_message( 'writing restart data', 'start' )
591
592       DO  i = 0, io_blocks-1
593          IF ( i == io_group )  THEN
594
595!
596!--          Open binary file
597             CALL check_open( 14 )
598!
599!--          Write control parameters and other global variables for restart.
600             IF ( myid == 0 )  CALL wrd_global
601!
602!--          Write processor specific flow field data for restart runs
603             CALL wrd_local
604!
605!--          Close binary file
606             CALL close_file( 14 )
607
608          ENDIF
609#if defined( __parallel )
610          CALL MPI_BARRIER( comm2d, ierr )
611#endif
612       ENDDO
613
614       CALL location_message( 'writing restart data', 'finished' )
615
616       CALL cpu_log( log_point(22), 'wrd_local', 'stop' )
617
618!
619!--    If required, write particle data in own restart files
620       IF ( particle_advection )  CALL lpm_write_restart_file
621       
622    ENDIF
623!
624!-- Last actions for surface output, for instantaneous and time-averaged data
625    CALL surface_data_output_last_action( 0 )
626    CALL surface_data_output_last_action( 1 )
627
628!
629!-- If required, repeat output of header including the required CPU-time
630    IF ( myid == 0 )  CALL header
631!
632!-- Perform module specific last actions
633    CALL cpu_log( log_point(4), 'last actions', 'start' )
634
635    IF ( myid == 0 .AND. agents_active ) CALL mas_last_actions ! ToDo: move to module_interface
636
637    CALL module_interface_last_actions
638
639    CALL cpu_log( log_point(4), 'last actions', 'stop' )
640
641!
642!-- Close files
643    CALL close_file( 0 )
644    CALL close_dvrp
645
646!
647!-- Write run number to file (used by palmrun to create unified cycle numbers
648!-- for output files
649    IF ( myid == 0  .AND.  runnr > 0 )  THEN
650       OPEN( 90, FILE='RUN_NUMBER', FORM='FORMATTED' )
651       WRITE( 90, '(I4)' )  runnr
652       CLOSE( 90 )
653    ENDIF
654
655!
656!-- Take final CPU-time for CPU-time analysis
657    CALL cpu_log( log_point(1), 'total', 'stop' )
658    CALL cpu_statistics
659
660#if defined( __parallel )
661    CALL MPI_FINALIZE( ierr )
662#endif
663
664 END PROGRAM palm
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