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source: palm/trunk/SOURCE/cpulog_mod.f90 @ 3721

Last change on this file since 3721 was 3655, checked in by knoop, 6 years ago
Bugfix: made "unit" and "found" intend INOUT in module interface subroutines + automatic copyright update
Property svn:keywords set to `Id`
File size: 22.5 KB

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1	!> @file cpulog_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: cpulog_mod.f90 3655 2019-01-07 16:51:22Z knoop $
27	! output format limited to a maximum line length of 80
28	!
29	! 3229 2018-09-04 15:05:36Z sward
30	! Bugfix in maximum time spent per log point: PE 0 was beeing ignored.
31	!
32	! 3049 2018-05-29 13:52:36Z Giersch
33	! Error messages revised
34	!
35	! 3045 2018-05-28 07:55:41Z Giersch
36	! Error messages revised
37	!
38	! 3028 2018-05-23 10:27:23Z knoop
39	! renamed d3par to runtime_parameters
40	!
41	! 2718 2018-01-02 08:49:38Z maronga
42	! Corrected "Former revisions" section
43	!
44	! 2696 2017-12-14 17:12:51Z kanani
45	! Change in file header (GPL part)
46	!
47	! 2266 2017-06-09 09:27:21Z raasch
48	! bugfix: cpu-time per grid point is now calculated using ngp_3d in order to
49	! avoid integer overflow,
50	! some re-formatting
51	!
52	! 2119 2017-01-17 16:51:50Z raasch
53	!
54	! 2118 2017-01-17 16:38:49Z raasch
55	! OpenACC relevant code removed
56	!
57	! 2000 2016-08-20 18:09:15Z knoop
58	! Forced header and separation lines into 80 columns
59	!
60	! 1931 2016-06-10 12:06:59Z suehring
61	! Adjustment in character length and format statement
62	!
63	! 1850 2016-04-08 13:29:27Z maronga
64	! Module renamed
65	!
66	!
67	! 1808 2016-04-05 19:44:00Z raasch
68	! cpu measurements are done with standard FORTRAN routine on every machine
69	!
70	! 1682 2015-10-07 23:56:08Z knoop
71	! Code annotations made doxygen readable
72	!
73	! 1402 2014-05-09 14:25:13Z raasch
74	! location messages added
75	!
76	! 1369 2014-04-24 05:57:38Z raasch
77	! routine description added
78	!
79	! 1353 2014-04-08 15:21:23Z heinze
80	! REAL constants provided with KIND-attribute
81	!
82	! 1322 2014-03-20 16:38:49Z raasch
83	! REAL functions provided with KIND-attribute
84	!
85	! 1320 2014-03-20 08:40:49Z raasch
86	! ONLY-attribute added to USE-statements,
87	! kind-parameters added to all INTEGER and REAL declaration statements,
88	! kinds are defined in new module kinds,
89	! revision history before 2012 removed,
90	! comment fields (!:) to be used for variable explanations added to
91	! all variable declaration statements
92	!
93	! 1318 2014-03-17 13:35:16Z raasch
94	! former files/routines cpu_log and cpu_statistics combined to one module,
95	! which also includes the former data module cpulog from the modules-file
96	!
97	! 1036 2012-10-22 13:43:42Z raasch
98	! code put under GPL (PALM 3.9)
99	!
100	! Revision 1.1 1997/07/24 11:12:29 raasch
101	! Initial revision
102	!
103	!
104	! Description:
105	! ------------
106	!> CPU-time measurements for any program part whatever. Results of the
107	!> measurements are output at the end of the run in local file CPU_MEASURES.
108	!>
109	!> To measure the CPU-time (better to say the wallclock time) of a specific code
110	!> segment, two calls of cpu_log have to be used as brackets in front and at the
111	!> end of the segment:
112	!>
113	!> CALL cpu_log( log_point(n), 'any identifier', 'start' )
114	!> ... code segment ...
115	!> CALL cpu_log( log_point(n), 'any identifier', 'stop' )
116	!>
117	!> Parts of the code segment can be excluded from the measurement by additional
118	!> call of cpu_log:
119	!>
120	!> ... first segment to be measured
121	!> CALL cpu_log( log_point(n), 'any identifier', 'pause' )
122	!> ... oart of segment to be excluded from measurement
123	!> CALL cpu_log( log_point(n), 'any identifier', 'continue' )
124	!> ... second segment to be mesasured
125	!>
126	!> n is an INTEGER within the interval [1,100] defining the id of the specific
127	!> code segment, 'any identifier' is a string describing the code segment to be
128	!> measured. It can be freely chosen and results will appear under this name in
129	!> file CPU_MEASURES. ids can only be used once. If you like to do a
130	!> measurement of a new part of the code, please look for an id which is unused
131	!> ao far.
132	!>
133	!> runtime_parameters-parameter cpu_log_barrierwait can be used to set an MPI
134	!> barrier at the beginning of the measurement (modus 'start' or 'continue'),
135	!> to avoid that idle times (due to MPI calls in the code segment, which are
136	!> waiting for other processes to be finished) affect the measurements.
137	!> If barriers shall not be used at all, a fourth, optional parameter has to be
138	!> given:
139	!>
140	!> CALL cpu_log( ..., ..., 'start', cpu_log_nowait )
141	!>
142	!> Variable log_point should be used for non-overlapping code segments, and they
143	!> should sum up to the total cpu-time required by the complete run.
144	!> Variable log_point_s can be used for any other special (s) measurements.
145	!------------------------------------------------------------------------------!
146	MODULE cpulog
147
148
149	USE control_parameters, &
150	ONLY: message_string, nr_timesteps_this_run, run_description_header, &
151	synchronous_exchange
152
153	USE indices, &
154	ONLY: ngp_3d, nx, ny, nz
155
156	USE kinds
157
158	USE pegrid
159
160	IMPLICIT NONE
161
162	PRIVATE
163	PUBLIC cpu_log, cpu_log_barrierwait, cpu_log_nowait, cpu_statistics, &
164	initial_wallclock_time, log_point, log_point_s
165
166	INTERFACE cpu_log
167	MODULE PROCEDURE cpu_log
168	END INTERFACE cpu_log
169
170	INTERFACE cpu_statistics
171	MODULE PROCEDURE cpu_statistics
172	END INTERFACE cpu_statistics
173
174	INTEGER(iwp), PARAMETER :: cpu_log_continue = 0 !<
175	INTEGER(iwp), PARAMETER :: cpu_log_pause = 1 !<
176	INTEGER(iwp), PARAMETER :: cpu_log_start = 2 !<
177	INTEGER(iwp), PARAMETER :: cpu_log_stop = 3 !<
178
179	LOGICAL :: cpu_log_barrierwait = .FALSE. !<
180	LOGICAL, PARAMETER :: cpu_log_nowait = .FALSE. !<
181
182	REAL(wp) :: initial_wallclock_time !<
183
184	TYPE logpoint
185	REAL(wp) :: isum !<
186	REAL(wp) :: ivect !<
187	REAL(wp) :: mean !<
188	REAL(wp) :: mtime !<
189	REAL(wp) :: mtimevec !<
190	REAL(wp) :: sum !<
191	REAL(wp) :: vector !<
192	INTEGER(iwp) :: counts !<
193	CHARACTER (LEN=25) :: place !<
194	END TYPE logpoint
195
196	TYPE(logpoint), DIMENSION(100) :: log_point = logpoint( 0.0_wp, 0.0_wp, &
197	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
198	0, ' ' )
199	TYPE(logpoint), DIMENSION(100) :: log_point_s = logpoint( 0.0_wp, 0.0_wp, &
200	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
201	0, ' ' )
202
203	SAVE
204
205	CONTAINS
206
207	!------------------------------------------------------------------------------!
208	! Description:
209	! ------------
210	!> @todo Missing subroutine description.
211	!------------------------------------------------------------------------------!
212	SUBROUTINE cpu_log( log_event, place, modus, barrierwait )
213
214	IMPLICIT NONE
215
216	CHARACTER (LEN=*) :: modus !<
217	CHARACTER (LEN=*) :: place !<
218
219	LOGICAL :: wait_allowed !<
220	LOGICAL, OPTIONAL :: barrierwait !<
221	LOGICAL, SAVE :: first = .TRUE. !<
222
223	REAL(wp) :: mtime = 0.0_wp !<
224	REAL(wp) :: mtimevec = 0.0_wp !<
225	TYPE(logpoint) :: log_event !<
226
227	INTEGER(idp) :: count !<
228	INTEGER(idp) :: count_rate !<
229
230
231	!
232	!-- Initialize and check, respectively, point of measurement
233	IF ( log_event%place == ' ' ) THEN
234	log_event%place = place
235	ELSEIF ( log_event%place /= place ) THEN
236	WRITE( message_string, * ) 'wrong argument expected: ', &
237	TRIM(log_event%place), ' given: ', TRIM( place )
238	CALL message( 'cpu_log', 'PA0174', 1, 2, 0, 6, 0 )
239	ENDIF
240
241	!
242	!-- Determine, if barriers are allowed to set
243	IF ( PRESENT( barrierwait ) ) THEN
244	wait_allowed = barrierwait
245	ELSE
246	wait_allowed = .TRUE.
247	ENDIF
248
249	!
250	!-- MPI barrier, if requested, in order to avoid measuring wait times
251	!-- caused by MPI routines waiting for other MPI routines of other
252	!-- PEs that have not yet finished
253	#if defined( __parallel )
254	IF ( cpu_log_barrierwait .AND. wait_allowed .AND. &
255	( modus == 'start' .OR. modus == 'continue' ) ) THEN
256	CALL MPI_BARRIER( comm2d, ierr )
257	ENDIF
258	#endif
259
260	!
261	!-- Take current time
262	CALL SYSTEM_CLOCK( count, count_rate )
263	mtime = REAL( count, KIND=wp ) / REAL( count_rate, KIND=wp )
264
265	!
266	!-- Start, stop or pause measurement
267	IF ( modus == 'start' .OR. modus == 'continue' ) THEN
268	log_event%mtime = mtime
269	log_event%mtimevec = mtimevec
270	ELSEIF ( modus == 'pause' ) THEN
271	IF ( ( mtime - log_event%mtime ) < 0.0 .AND. first ) THEN
272	WRITE( message_string, * ) 'negative time interval occured', &
273	'&PE',myid,' L=PAUSE "',TRIM(log_event%place), &
274	'" new=', mtime,' last=',log_event%mtime
275	CALL message( 'cpu_log', 'PA0176', 0, 1, -1, 6, 0 )
276	first = .FALSE.
277	ENDIF
278	log_event%isum = log_event%isum + mtime - log_event%mtime
279	log_event%ivect = log_event%ivect + mtimevec - log_event%mtimevec
280	ELSEIF ( modus == 'stop' ) THEN
281	IF ( ( mtime - log_event%mtime + log_event%isum ) < 0.0 .AND. &
282	first ) THEN
283	WRITE( message_string, * ) 'negative time interval occured', &
284	'&PE',myid,' L=STOP "',TRIM(log_event%place),'" new=', &
285	mtime,' last=',log_event%mtime,' isum=',log_event%isum
286	CALL message( 'cpu_log', 'PA0177', 0, 1, -1, 6, 0 )
287	first = .FALSE.
288	ENDIF
289	log_event%mtime = mtime - log_event%mtime + log_event%isum
290	log_event%mtimevec = mtimevec - log_event%mtimevec + log_event%ivect
291	log_event%sum = log_event%sum + log_event%mtime
292	IF ( log_event%sum < 0.0 .AND. first ) THEN
293	WRITE( message_string, * ) 'negative time interval occured', &
294	'&PE',myid,' L=STOP "',TRIM(log_event%place),'" sum=', &
295	log_event%sum,' mtime=',log_event%mtime
296	CALL message( 'cpu_log', 'PA0178', 0, 1, -1, 6, 0 )
297	first = .FALSE.
298	ENDIF
299	log_event%vector = log_event%vector + log_event%mtimevec
300	log_event%counts = log_event%counts + 1
301	log_event%isum = 0.0_wp
302	log_event%ivect = 0.0_wp
303	ELSE
304	message_string = 'unknown modus of time measurement: ' // &
305	TRIM( modus )
306	CALL message( 'cpu_log', 'PA0179', 0, 1, -1, 6, 0 )
307	ENDIF
308
309	END SUBROUTINE cpu_log
310
311
312	!------------------------------------------------------------------------------!
313	! Description:
314	! ------------
315	!> Analysis and output of the cpu-times measured. All PE results are collected
316	!> on PE0 in order to calculate the mean cpu-time over all PEs and other
317	!> statistics. The output is sorted according to the amount of cpu-time consumed
318	!> and output on PE0.
319	!------------------------------------------------------------------------------!
320
321	SUBROUTINE cpu_statistics
322
323	IMPLICIT NONE
324
325	INTEGER(iwp) :: i !<
326	INTEGER(iwp) :: ii(1) !<
327	INTEGER(iwp) :: iii !<
328	INTEGER(iwp) :: sender !<
329	REAL(wp) :: average_cputime !<
330	REAL(wp), SAVE :: norm = 1.0_wp !<
331	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_max !<
332	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_min !<
333	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_rms !<
334	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_tmp !<
335	REAL(wp), DIMENSION(:), ALLOCATABLE :: sum !<
336	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: pe_log_points !<
337
338
339	CALL location_message( 'calculating cpu statistics', .FALSE. )
340
341	!
342	!-- Compute cpu-times in seconds
343	log_point%mtime = log_point%mtime / norm
344	log_point%sum = log_point%sum / norm
345	log_point%vector = log_point%vector / norm
346	WHERE ( log_point%counts /= 0 )
347	log_point%mean = log_point%sum / log_point%counts
348	END WHERE
349
350
351	!
352	!-- Collect cpu-times from all PEs and calculate statistics
353	IF ( myid == 0 ) THEN
354	!
355	!-- Allocate and initialize temporary arrays needed for statistics
356	ALLOCATE( pe_max( SIZE( log_point ) ), pe_min( SIZE( log_point ) ), &
357	pe_rms( SIZE( log_point ) ), pe_tmp( SIZE( log_point ) ), &
358	pe_log_points( SIZE( log_point ), 0:numprocs-1 ) )
359	pe_min = log_point%sum
360	pe_max = log_point%sum ! need to be set in case of 1 PE
361	pe_rms = 0.0_wp
362	pe_tmp = 0.0_wp
363
364	#if defined( __parallel )
365	!
366	!-- Receive data from all PEs
367	DO i = 1, numprocs-1
368	CALL MPI_RECV( pe_tmp(1), SIZE( log_point ), MPI_REAL, &
369	i, i, comm2d, status, ierr )
370	sender = status(MPI_SOURCE)
371	pe_log_points(:,sender) = pe_tmp
372	ENDDO
373	pe_log_points(:,0) = log_point%sum ! Results from PE0
374	!
375	!-- Calculate mean of all PEs, store it on log_point%sum
376	!-- and find minimum and maximum
377	DO iii = 1, SIZE( log_point )
378	DO i = 1, numprocs-1
379	log_point(iii)%sum = log_point(iii)%sum + pe_log_points(iii,i)
380	pe_min(iii) = MIN( pe_min(iii), pe_log_points(iii,i) )
381	pe_max(iii) = MAX( pe_max(iii), pe_log_points(iii,i) )
382	ENDDO
383	log_point(iii)%sum = log_point(iii)%sum / numprocs
384	!
385	!-- Calculate rms
386	DO i = 0, numprocs-1
387	pe_rms(iii) = pe_rms(iii) + ( &
388	pe_log_points(iii,i) - log_point(iii)%sum &
389	)**2
390	ENDDO
391	pe_rms(iii) = SQRT( pe_rms(iii) / numprocs )
392	ENDDO
393	ELSE
394	!
395	!-- Send data to PE0 (pe_max is used as temporary storage to send
396	!-- the data in order to avoid sending the data type log)
397	ALLOCATE( pe_max( SIZE( log_point ) ) )
398	pe_max = log_point%sum
399	CALL MPI_SEND( pe_max(1), SIZE( log_point ), MPI_REAL, 0, myid, &
400	comm2d, ierr )
401	#endif
402
403	ENDIF
404
405	!
406	!-- Write cpu-times
407	IF ( myid == 0 ) THEN
408	!
409	!-- Re-store sums
410	ALLOCATE( sum( SIZE( log_point ) ) )
411	WHERE ( log_point%counts /= 0 )
412	sum = log_point%sum
413	ELSEWHERE
414	sum = -1.0_wp
415	ENDWHERE
416
417	!
418	!-- Get total time in order to calculate CPU-time per gridpoint and
419	!-- timestep
420	IF ( nr_timesteps_this_run /= 0 ) THEN
421	average_cputime = log_point(1)%sum / REAL( ngp_3d(0), KIND=wp ) / &
422	REAL( nr_timesteps_this_run, KIND=wp ) * 1E6_wp
423	! in micro-sec
424	ELSE
425	average_cputime = -1.0_wp
426	ENDIF
427
428	!
429	!-- Write cpu-times sorted by size
430	CALL check_open( 18 )
431	#if defined( __parallel )
432	WRITE ( 18, 100 ) TRIM( run_description_header ), &
433	numprocs * threads_per_task, pdims(1), pdims(2), &
434	threads_per_task, nx+1, ny+1, nz, &
435	nr_timesteps_this_run, average_cputime
436
437	WRITE ( 18, 110 )
438	#else
439	WRITE ( 18, 100 ) TRIM( run_description_header ), &
440	numprocs * threads_per_task, 1, 1, &
441	threads_per_task, nx+1, ny+1, nz, &
442	nr_timesteps_this_run, average_cputime
443
444	WRITE ( 18, 110 )
445	#endif
446	DO
447	ii = MAXLOC( sum )
448	i = ii(1)
449	IF ( sum(i) /= -1.0_wp ) THEN
450	WRITE ( 18, 102 ) &
451	log_point(i)%place, log_point(i)%sum, &
452	log_point(i)%sum / log_point(1)%sum * 100.0_wp, &
453	log_point(i)%counts, pe_min(i), pe_max(i), pe_rms(i)
454	sum(i) = -1.0_wp
455	ELSE
456	EXIT
457	ENDIF
458	ENDDO
459	ENDIF
460
461
462	!
463	!-- The same procedure again for the individual measurements.
464	!
465	!-- Compute cpu-times in seconds
466	log_point_s%mtime = log_point_s%mtime / norm
467	log_point_s%sum = log_point_s%sum / norm
468	log_point_s%vector = log_point_s%vector / norm
469	WHERE ( log_point_s%counts /= 0 )
470	log_point_s%mean = log_point_s%sum / log_point_s%counts
471	END WHERE
472
473	!
474	!-- Collect cpu-times from all PEs and calculate statistics
475	#if defined( __parallel )
476	!
477	!-- Set barrier in order to avoid that PE0 receives log_point_s-data
478	!-- while still busy with receiving log_point-data (see above)
479	CALL MPI_BARRIER( comm2d, ierr )
480	#endif
481	IF ( myid == 0 ) THEN
482	!
483	!-- Initialize temporary arrays needed for statistics
484	pe_min = log_point_s%sum
485	pe_max = log_point_s%sum ! need to be set in case of 1 PE
486	pe_rms = 0.0_wp
487
488	#if defined( __parallel )
489	!
490	!-- Receive data from all PEs
491	DO i = 1, numprocs-1
492	CALL MPI_RECV( pe_tmp(1), SIZE( log_point ), MPI_REAL, &
493	MPI_ANY_SOURCE, MPI_ANY_TAG, comm2d, status, ierr )
494	sender = status(MPI_SOURCE)
495	pe_log_points(:,sender) = pe_tmp
496	ENDDO
497	pe_log_points(:,0) = log_point_s%sum ! Results from PE0
498	!
499	!-- Calculate mean of all PEs, store it on log_point_s%sum
500	!-- and find minimum and maximum
501	DO iii = 1, SIZE( log_point )
502	DO i = 1, numprocs-1
503	log_point_s(iii)%sum = log_point_s(iii)%sum + &
504	pe_log_points(iii,i)
505	pe_min(iii) = MIN( pe_min(iii), pe_log_points(iii,i) )
506	pe_max(iii) = MAX( pe_max(iii), pe_log_points(iii,i) )
507	ENDDO
508	log_point_s(iii)%sum = log_point_s(iii)%sum / numprocs
509	!
510	!-- Calculate rms
511	DO i = 0, numprocs-1
512	pe_rms(iii) = pe_rms(iii) + ( &
513	pe_log_points(iii,i) - log_point_s(iii)%sum &
514	)**2
515	ENDDO
516	pe_rms(iii) = SQRT( pe_rms(iii) / numprocs )
517	ENDDO
518	ELSE
519	!
520	!-- Send data to PE0 (pe_max is used as temporary storage to send
521	!-- the data in order to avoid sending the data type log)
522	pe_max = log_point_s%sum
523	CALL MPI_SEND( pe_max(1), SIZE( log_point ), MPI_REAL, 0, 0, comm2d, &
524	ierr )
525	#endif
526
527	ENDIF
528
529	!
530	!-- Write cpu-times
531	IF ( myid == 0 ) THEN
532	!
533	!-- Re-store sums
534	WHERE ( log_point_s%counts /= 0 )
535	sum = log_point_s%sum
536	ELSEWHERE
537	sum = -1.0_wp
538	ENDWHERE
539
540	!
541	!-- Write cpu-times sorted by size
542	WRITE ( 18, 101 )
543	DO
544	ii = MAXLOC( sum )
545	i = ii(1)
546	IF ( sum(i) /= -1.0_wp ) THEN
547	WRITE ( 18, 102 ) &
548	log_point_s(i)%place, log_point_s(i)%sum, &
549	log_point_s(i)%sum / log_point(1)%sum * 100.0_wp, &
550	log_point_s(i)%counts, pe_min(i), pe_max(i), pe_rms(i)
551	sum(i) = -1.0_wp
552	ELSE
553	EXIT
554	ENDIF
555	ENDDO
556
557	!
558	!-- Output of handling of MPI operations
559	IF ( collective_wait ) THEN
560	WRITE ( 18, 103 )
561	ELSE
562	WRITE ( 18, 104 )
563	ENDIF
564	IF ( cpu_log_barrierwait ) WRITE ( 18, 111 )
565	IF ( synchronous_exchange ) THEN
566	WRITE ( 18, 105 )
567	ELSE
568	WRITE ( 18, 106 )
569	ENDIF
570
571	!
572	!-- Empty lines in order to create a gap to the results of the model
573	!-- continuation runs
574	WRITE ( 18, 107 )
575
576	!
577	!-- Unit 18 is not needed anymore
578	CALL close_file( 18 )
579
580	ENDIF
581
582	CALL location_message( 'finished', .TRUE. )
583
584	100 FORMAT (A/11('-')//'CPU measures for ',I5,' PEs (',I5,'(x) * ',I5,'(y', &
585	&') tasks *',I5,' threads):'// &
586	'gridpoints (x/y/z): ',20X,I5,' * ',I5,' * ',I5/ &
587	'nr of timesteps: ',22X,I6/ &
588	'cpu time per grid point and timestep: ',5X,F8.5,' * 10**-6 s')
589
590	101 FORMAT (/'special measures:'/ &
591	&'-----------------------------------------------------------', &
592	&'---------------------')
593
594	102 FORMAT (A25,2X,F9.3,2X,F7.2,1X,I7,2(1X,F9.3),1X,F5.2)
595	103 FORMAT (/'Barriers are set in front of collective operations')
596	104 FORMAT (/'No barriers are set in front of collective operations')
597	105 FORMAT (/'Exchange of ghostpoints via MPI_SENDRCV')
598	106 FORMAT (/'Exchange of ghostpoints via MPI_ISEND/MPI_IRECV')
599	107 FORMAT (//)
600	110 FORMAT ('------------------------------------------------------------', &
601	&'----------'// &
602	&'place: mean counts ', &
603	&' min max rms'/ &
604	&' sec. % ', &
605	&'sec. sec. sec.'/ &
606	&'-----------------------------------------------------------', &
607	&'---------------------')
608	111 FORMAT (/'Barriers are set at beginning (start/continue) of measurements')
609
610	END SUBROUTINE cpu_statistics
611
612	END MODULE cpulog

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