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source: palm/trunk/SOURCE/cpulog.f90 @ 1395

Last change on this file since 1395 was 1370, checked in by raasch, 11 years ago
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[1318]	1	MODULE cpulog
[1]	2
[1036]	3	!--------------------------------------------------------------------------------!
	4	! This file is part of PALM.
	5	!
	6	! PALM is free software: you can redistribute it and/or modify it under the terms
	7	! of the GNU General Public License as published by the Free Software Foundation,
	8	! either version 3 of the License, or (at your option) any later 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	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[1354]	22	!
[1370]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: cpulog.f90 1370 2014-04-24 06:06:17Z keck $
	27	!
[1370]	28	! 1369 2014-04-24 05:57:38Z raasch
	29	! routine description added
	30	!
[1354]	31	! 1353 2014-04-08 15:21:23Z heinze
	32	! REAL constants provided with KIND-attribute
	33	!
[1323]	34	! 1322 2014-03-20 16:38:49Z raasch
	35	! REAL functions provided with KIND-attribute
	36	!
[1321]	37	! 1320 2014-03-20 08:40:49Z raasch
[1320]	38	! ONLY-attribute added to USE-statements,
	39	! kind-parameters added to all INTEGER and REAL declaration statements,
	40	! kinds are defined in new module kinds,
	41	! revision history before 2012 removed,
	42	! comment fields (!:) to be used for variable explanations added to
	43	! all variable declaration statements
[1321]	44	!
[1319]	45	! 1318 2014-03-17 13:35:16Z raasch
	46	! former files/routines cpu_log and cpu_statistics combined to one module,
	47	! which also includes the former data module cpulog from the modules-file
	48	!
[1037]	49	! 1036 2012-10-22 13:43:42Z raasch
	50	! code put under GPL (PALM 3.9)
	51	!
[1]	52	! Revision 1.1 1997/07/24 11:12:29 raasch
	53	! Initial revision
	54	!
	55	!
	56	! Description:
	57	! ------------
[1369]	58	! CPU-time measurements for any program part whatever. Results of the
	59	! measurements are output at the end of the run in local file CPU_MEASURES.
	60	!
	61	! To measure the CPU-time (better to say the wallclock time) of a specific code
	62	! segment, two calls of cpu_log have to be used as brackets in front and at the
	63	! end of the segment:
	64	!
	65	! CALL cpu_log( log_point(n), 'any identifier', 'start' )
	66	! ... code segment ...
	67	! CALL cpu_log( log_point(n), 'any identifier', 'stop' )
	68	!
	69	! Parts of the code segment can be excluded from the measurement by additional
	70	! call of cpu_log:
	71	!
	72	! ... first segment to be measured
	73	! CALL cpu_log( log_point(n), 'any identifier', 'pause' )
	74	! ... oart of segment to be excluded from measurement
	75	! CALL cpu_log( log_point(n), 'any identifier', 'continue' )
	76	! ... second segment to be mesasured
	77	!
	78	! n is an INTEGER within the interval [1,100] defining the id of the specific
	79	! code segment, 'any identifier' is a string describing the code segment to be
	80	! measured. It can be freely chosen and results will appear under this name in
	81	! file CPU_MEASURES. ids can only be used once. If you like to do a
	82	! measurement of a new part of the code, please look for an id which is unused
	83	! ao far.
	84	!
	85	! d3par-parameter cpu_log_barrierwait can be used to set an MPI barrier at the
	86	! beginning of the measurement (modus 'start' or 'continue'), to avoid that
	87	! idle times (due to MPI calls in the code segment, which are
	88	! waiting for other processes to be finished) affect the measurements.
	89	! If barriers shall not be used at all, a fourth, optional parameter has to be
	90	! given:
	91	!
	92	! CALL cpu_log( ..., ..., 'start', cpu_log_nowait )
	93	!
	94	! Variable log_point should be used for non-overlapping code segments, and they
	95	! should sum up to the total cpu-time required by the complete run.
	96	! Variable log_point_s can be used for any other special (s) measurements.
[3]	97	!------------------------------------------------------------------------------!
[1]	98
[1320]	99	USE control_parameters, &
	100	ONLY: message_string, nr_timesteps_this_run, run_description_header, &
	101	synchronous_exchange
	102
	103	USE indices, &
	104	ONLY: nx, ny, nz
	105
	106	USE kinds
	107
[1]	108	USE pegrid
	109
	110	IMPLICIT NONE
	111
[1318]	112	PRIVATE
[1320]	113	PUBLIC cpu_log, cpu_log_barrierwait, cpu_log_nowait, cpu_statistics, &
[1318]	114	initial_wallclock_time, log_point, log_point_s
[1]	115
[1318]	116	INTERFACE cpu_log
	117	MODULE PROCEDURE cpu_log
	118	END INTERFACE cpu_log
	119
	120	INTERFACE cpu_statistics
	121	MODULE PROCEDURE cpu_statistics
	122	END INTERFACE cpu_statistics
	123
[1320]	124	INTEGER(iwp), PARAMETER :: cpu_log_continue = 0 !:
	125	INTEGER(iwp), PARAMETER :: cpu_log_pause = 1 !:
	126	INTEGER(iwp), PARAMETER :: cpu_log_start = 2 !:
	127	INTEGER(iwp), PARAMETER :: cpu_log_stop = 3 !:
[1318]	128
[1320]	129	LOGICAL :: cpu_log_barrierwait = .FALSE. !:
	130	LOGICAL, PARAMETER :: cpu_log_nowait = .FALSE. !:
[1318]	131
[1320]	132	REAL(wp) :: initial_wallclock_time !:
[1318]	133
	134	TYPE logpoint
[1320]	135	REAL(wp) :: isum !:
	136	REAL(wp) :: ivect !:
	137	REAL(wp) :: mean !:
	138	REAL(wp) :: mtime !:
	139	REAL(wp) :: mtimevec !:
	140	REAL(wp) :: sum !:
	141	REAL(wp) :: vector !:
	142	INTEGER(iwp) :: counts !:
	143	CHARACTER (LEN=20) :: place !:
[1318]	144	END TYPE logpoint
	145
[1353]	146	TYPE(logpoint), DIMENSION(100) :: log_point = logpoint( 0.0_wp, 0.0_wp, &
	147	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
	148	0, ' ' ), &
	149	log_point_s = logpoint( 0.0_wp, 0.0_wp, &
	150	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
	151	0, ' ' )
[1318]	152
	153	SAVE
	154
	155	CONTAINS
	156
	157	SUBROUTINE cpu_log( log_event, place, modus, barrierwait )
	158
	159	IMPLICIT NONE
	160
[1320]	161	CHARACTER (LEN=*) :: modus !:
	162	CHARACTER (LEN=*) :: place !:
	163
	164	LOGICAL :: wait_allowed !:
	165	LOGICAL, OPTIONAL :: barrierwait !:
	166	LOGICAL, SAVE :: first = .TRUE. !:
	167
[1353]	168	REAL(wp) :: mtime = 0.0_wp !:
	169	REAL(wp) :: mtimevec = 0.0_wp !:
[1320]	170	TYPE(logpoint) :: log_event !:
[1318]	171
[239]	172	#if defined( __lc ) \|\| defined( __decalpha )
[1320]	173	INTEGER(idp) :: count !:
	174	INTEGER(idp) :: count_rate !:
[239]	175	#elif defined( __nec )
[1320]	176	INTEGER(iwp) :: count !:
	177	INTEGER(iwp) :: count_rate !:
[1]	178	#elif defined( __ibm )
[1320]	179	INTEGER(idp) :: IRTC !:
[1]	180	#endif
	181
	182
	183	!
[1318]	184	!-- Initialize and check, respectively, point of measurement
	185	IF ( log_event%place == ' ' ) THEN
	186	log_event%place = place
	187	ELSEIF ( log_event%place /= place ) THEN
[1320]	188	WRITE( message_string, * ) 'wrong argument & expected: ', &
[1318]	189	TRIM(log_event%place), ' given: ', TRIM( place )
	190	CALL message( 'cpu_log', 'PA0174', 1, 2, 0, 6, 0 )
	191	ENDIF
[1]	192
	193	!
[1318]	194	!-- Determine, if barriers are allowed to set
	195	IF ( PRESENT( barrierwait ) ) THEN
	196	wait_allowed = barrierwait
	197	ELSE
	198	wait_allowed = .TRUE.
	199	ENDIF
	200
	201	!
	202	!-- MPI barrier, if requested, in order to avoid measuring wait times
	203	!-- caused by MPI routines waiting for other MPI routines of other
	204	!-- PEs that have not yet finished
	205	#if defined( __parallel )
[1320]	206	IF ( cpu_log_barrierwait .AND. wait_allowed .AND. &
[1318]	207	( modus == 'start' .OR. modus == 'continue' ) ) THEN
	208	CALL MPI_BARRIER( comm2d, ierr )
	209	ENDIF
	210	#endif
	211
	212	!
	213	!-- Take current time
[82]	214	#if defined( __lc ) \|\| defined( __decalpha ) \|\| defined( __nec )
[1318]	215	CALL SYSTEM_CLOCK( count, count_rate )
[1322]	216	mtime = REAL( count, KIND=wp ) / REAL( count_rate, KIND=wp )
[1]	217	#elif defined( __ibm )
[1322]	218	mtime = IRTC( ) * 1E-9_wp
[1]	219	#else
[1318]	220	message_string = 'no time measurement defined on this host'
	221	CALL message( 'cpu_log', 'PA0175', 1, 2, 0, 6, 0 )
[1]	222	#endif
	223
	224	!
[1318]	225	!-- Start, stop or pause measurement
	226	IF ( modus == 'start' .OR. modus == 'continue' ) THEN
	227	log_event%mtime = mtime
	228	log_event%mtimevec = mtimevec
	229	ELSEIF ( modus == 'pause' ) THEN
	230	IF ( ( mtime - log_event%mtime ) < 0.0 .AND. first ) THEN
[1320]	231	WRITE( message_string, * ) 'negative time interval occured', &
	232	' &PE',myid,' L=PAUSE "',TRIM(log_event%place), &
	233	'" new=', mtime,' last=',log_event%mtime
[1318]	234	CALL message( 'cpu_log', 'PA0176', 0, 1, -1, 6, 0 )
	235	first = .FALSE.
	236	ENDIF
	237	log_event%isum = log_event%isum + mtime - log_event%mtime
	238	log_event%ivect = log_event%ivect + mtimevec - log_event%mtimevec
	239	ELSEIF ( modus == 'stop' ) THEN
[1320]	240	IF ( ( mtime - log_event%mtime + log_event%isum ) < 0.0 .AND. &
[1318]	241	first ) THEN
[1320]	242	WRITE( message_string, * ) 'negative time interval occured', &
[1318]	243	' &PE',myid,' L=STOP "',TRIM(log_event%place),'" new=', &
	244	mtime,' last=',log_event%mtime,' isum=',log_event%isum
	245	CALL message( 'cpu_log', 'PA0177', 0, 1, -1, 6, 0 )
	246	first = .FALSE.
	247	ENDIF
	248	log_event%mtime = mtime - log_event%mtime + log_event%isum
	249	log_event%mtimevec = mtimevec - log_event%mtimevec + log_event%ivect
	250	log_event%sum = log_event%sum + log_event%mtime
	251	IF ( log_event%sum < 0.0 .AND. first ) THEN
[1320]	252	WRITE( message_string, * ) 'negative time interval occured', &
[1318]	253	' &PE',myid,' L=STOP "',TRIM(log_event%place),'" sum=', &
	254	log_event%sum,' mtime=',log_event%mtime
	255	CALL message( 'cpu_log', 'PA0178', 0, 1, -1, 6, 0 )
	256	first = .FALSE.
	257	ENDIF
	258	log_event%vector = log_event%vector + log_event%mtimevec
	259	log_event%counts = log_event%counts + 1
[1353]	260	log_event%isum = 0.0_wp
	261	log_event%ivect = 0.0_wp
[1318]	262	ELSE
	263	message_string = 'unknown modus of time measurement: ' // TRIM( modus )
	264	CALL message( 'cpu_log', 'PA0179', 0, 1, -1, 6, 0 )
[1]	265	ENDIF
[1318]	266
	267	END SUBROUTINE cpu_log
	268
	269
	270	SUBROUTINE cpu_statistics
	271	!------------------------------------------------------------------------------!
	272	! Description:
	273	! ------------
	274	! Analysis and output of the cpu-times measured. All PE results are collected
	275	! on PE0 in order to calculate the mean cpu-time over all PEs and other
	276	! statistics. The output is sorted according to the amount of cpu-time consumed
	277	! and output on PE0.
	278	!------------------------------------------------------------------------------!
	279
	280	IMPLICIT NONE
	281
[1320]	282	INTEGER(iwp) :: i !:
	283	INTEGER(iwp) :: ii(1) !:
	284	INTEGER(iwp) :: iii !:
	285	INTEGER(iwp) :: sender !:
	286	REAL(wp) :: average_cputime !:
[1353]	287	REAL(wp), SAVE :: norm = 1.0_wp !:
[1320]	288	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_max !:
	289	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_min !:
	290	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_rms !:
	291	REAL(wp), DIMENSION(:), ALLOCATABLE :: sum !:
	292	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: pe_log_points !:
[1318]	293
	294
	295	!
	296	!-- Compute cpu-times in seconds
	297	log_point%mtime = log_point%mtime / norm
	298	log_point%sum = log_point%sum / norm
	299	log_point%vector = log_point%vector / norm
	300	WHERE ( log_point%counts /= 0 )
	301	log_point%mean = log_point%sum / log_point%counts
	302	END WHERE
	303
	304
	305	!
	306	!-- Collect cpu-times from all PEs and calculate statistics
	307	IF ( myid == 0 ) THEN
	308	!
	309	!-- Allocate and initialize temporary arrays needed for statistics
[1320]	310	ALLOCATE( pe_max( SIZE( log_point ) ), pe_min( SIZE( log_point ) ), &
	311	pe_rms( SIZE( log_point ) ), &
[1318]	312	pe_log_points( SIZE( log_point ), 0:numprocs-1 ) )
	313	pe_min = log_point%sum
	314	pe_max = log_point%sum ! need to be set in case of 1 PE
[1353]	315	pe_rms = 0.0_wp
[1318]	316
	317	#if defined( __parallel )
	318	!
	319	!-- Receive data from all PEs
	320	DO i = 1, numprocs-1
[1320]	321	CALL MPI_RECV( pe_max(1), SIZE( log_point ), MPI_REAL, &
[1318]	322	i, i, comm2d, status, ierr )
	323	sender = status(MPI_SOURCE)
	324	pe_log_points(:,sender) = pe_max
	325	ENDDO
	326	pe_log_points(:,0) = log_point%sum ! Results from PE0
	327	!
	328	!-- Calculate mean of all PEs, store it on log_point%sum
	329	!-- and find minimum and maximum
	330	DO iii = 1, SIZE( log_point )
	331	DO i = 1, numprocs-1
	332	log_point(iii)%sum = log_point(iii)%sum + pe_log_points(iii,i)
	333	pe_min(iii) = MIN( pe_min(iii), pe_log_points(iii,i) )
	334	pe_max(iii) = MAX( pe_max(iii), pe_log_points(iii,i) )
	335	ENDDO
	336	log_point(iii)%sum = log_point(iii)%sum / numprocs
	337	!
	338	!-- Calculate rms
	339	DO i = 0, numprocs-1
[1320]	340	pe_rms(iii) = pe_rms(iii) + ( &
	341	pe_log_points(iii,i) - log_point(iii)%sum &
[1318]	342	)**2
	343	ENDDO
	344	pe_rms(iii) = SQRT( pe_rms(iii) / numprocs )
	345	ENDDO
	346	ELSE
	347	!
	348	!-- Send data to PE0 (pe_max is used as temporary storage to send
	349	!-- the data in order to avoid sending the data type log)
	350	ALLOCATE( pe_max( SIZE( log_point ) ) )
	351	pe_max = log_point%sum
	352	CALL MPI_SEND( pe_max(1), SIZE( log_point ), MPI_REAL, 0, myid, comm2d, &
	353	ierr )
	354	#endif
	355
[1]	356	ENDIF
[1318]	357
	358	!
	359	!-- Write cpu-times
	360	IF ( myid == 0 ) THEN
	361	!
	362	!-- Re-store sums
	363	ALLOCATE( sum( SIZE( log_point ) ) )
	364	WHERE ( log_point%counts /= 0 )
	365	sum = log_point%sum
	366	ELSEWHERE
[1353]	367	sum = -1.0_wp
[1318]	368	ENDWHERE
	369
	370	!
	371	!-- Get total time in order to calculate CPU-time per gridpoint and timestep
	372	IF ( nr_timesteps_this_run /= 0 ) THEN
[1322]	373	average_cputime = log_point(1)%sum / REAL( (nx+1) * (ny+1) * nz, KIND=wp ) / &
	374	REAL( nr_timesteps_this_run, KIND=wp ) * 1E6_wp ! in micro-sec
[1318]	375	ELSE
[1353]	376	average_cputime = -1.0_wp
[1318]	377	ENDIF
	378
	379	!
	380	!-- Write cpu-times sorted by size
	381	CALL check_open( 18 )
	382	#if defined( __parallel )
	383	WRITE ( 18, 100 ) TRIM( run_description_header ), &
	384	numprocs * threads_per_task, pdims(1), pdims(2), &
	385	threads_per_task, nx+1, ny+1, nz, nr_timesteps_this_run, &
	386	average_cputime
	387
	388	IF ( num_acc_per_node /= 0 ) WRITE ( 18, 108 ) num_acc_per_node
	389	WRITE ( 18, 110 )
	390	#else
	391	WRITE ( 18, 100 ) TRIM( run_description_header ), &
	392	numprocs * threads_per_task, 1, 1, &
	393	threads_per_task, nx+1, ny+1, nz, nr_timesteps_this_run, &
	394	average_cputime
	395
	396	IF ( num_acc_per_node /= 0 ) WRITE ( 18, 109 ) num_acc_per_node
	397	WRITE ( 18, 110 )
	398	#endif
	399	DO
	400	ii = MAXLOC( sum )
	401	i = ii(1)
[1353]	402	IF ( sum(i) /= -1.0_wp ) THEN
[1318]	403	WRITE ( 18, 102 ) &
[1353]	404	log_point(i)%place, log_point(i)%sum, &
	405	log_point(i)%sum / log_point(1)%sum * 100.0_wp, &
[1318]	406	log_point(i)%counts, pe_min(i), pe_max(i), pe_rms(i)
[1353]	407	sum(i) = -1.0_wp
[1318]	408	ELSE
	409	EXIT
	410	ENDIF
	411	ENDDO
[1]	412	ENDIF
	413
	414
[1318]	415	!
	416	!-- The same procedure again for the individual measurements.
	417	!
	418	!-- Compute cpu-times in seconds
	419	log_point_s%mtime = log_point_s%mtime / norm
	420	log_point_s%sum = log_point_s%sum / norm
	421	log_point_s%vector = log_point_s%vector / norm
	422	WHERE ( log_point_s%counts /= 0 )
	423	log_point_s%mean = log_point_s%sum / log_point_s%counts
	424	END WHERE
	425
	426	!
	427	!-- Collect cpu-times from all PEs and calculate statistics
	428	#if defined( __parallel )
	429	!
	430	!-- Set barrier in order to avoid that PE0 receives log_point_s-data
	431	!-- while still busy with receiving log_point-data (see above)
	432	CALL MPI_BARRIER( comm2d, ierr )
	433	#endif
	434	IF ( myid == 0 ) THEN
	435	!
	436	!-- Initialize temporary arrays needed for statistics
	437	pe_min = log_point_s%sum
	438	pe_max = log_point_s%sum ! need to be set in case of 1 PE
[1353]	439	pe_rms = 0.0_wp
[1318]	440
	441	#if defined( __parallel )
	442	!
	443	!-- Receive data from all PEs
	444	DO i = 1, numprocs-1
	445	CALL MPI_RECV( pe_max(1), SIZE( log_point ), MPI_REAL, &
	446	MPI_ANY_SOURCE, MPI_ANY_TAG, comm2d, status, ierr )
	447	sender = status(MPI_SOURCE)
	448	pe_log_points(:,sender) = pe_max
	449	ENDDO
	450	pe_log_points(:,0) = log_point_s%sum ! Results from PE0
	451	!
	452	!-- Calculate mean of all PEs, store it on log_point_s%sum
	453	!-- and find minimum and maximum
	454	DO iii = 1, SIZE( log_point )
	455	DO i = 1, numprocs-1
	456	log_point_s(iii)%sum = log_point_s(iii)%sum + pe_log_points(iii,i)
	457	pe_min(iii) = MIN( pe_min(iii), pe_log_points(iii,i) )
	458	pe_max(iii) = MAX( pe_max(iii), pe_log_points(iii,i) )
	459	ENDDO
	460	log_point_s(iii)%sum = log_point_s(iii)%sum / numprocs
	461	!
	462	!-- Calculate rms
	463	DO i = 0, numprocs-1
[1353]	464	pe_rms(iii) = pe_rms(iii) + ( &
[1318]	465	pe_log_points(iii,i) - log_point_s(iii)%sum &
	466	)**2
	467	ENDDO
	468	pe_rms(iii) = SQRT( pe_rms(iii) / numprocs )
	469	ENDDO
	470	ELSE
	471	!
	472	!-- Send data to PE0 (pe_max is used as temporary storage to send
	473	!-- the data in order to avoid sending the data type log)
	474	pe_max = log_point_s%sum
	475	CALL MPI_SEND( pe_max(1), SIZE( log_point ), MPI_REAL, 0, 0, comm2d, &
	476	ierr )
	477	#endif
	478
	479	ENDIF
	480
	481	!
	482	!-- Write cpu-times
	483	IF ( myid == 0 ) THEN
	484	!
	485	!-- Re-store sums
	486	WHERE ( log_point_s%counts /= 0 )
	487	sum = log_point_s%sum
	488	ELSEWHERE
[1353]	489	sum = -1.0_wp
[1318]	490	ENDWHERE
	491
	492	!
	493	!-- Write cpu-times sorted by size
	494	WRITE ( 18, 101 )
	495	DO
	496	ii = MAXLOC( sum )
	497	i = ii(1)
[1353]	498	IF ( sum(i) /= -1.0_wp ) THEN
	499	WRITE ( 18, 102 ) &
	500	log_point_s(i)%place, log_point_s(i)%sum, &
	501	log_point_s(i)%sum / log_point(1)%sum * 100.0_wp, &
[1318]	502	log_point_s(i)%counts, pe_min(i), pe_max(i), pe_rms(i)
[1353]	503	sum(i) = -1.0_wp
[1318]	504	ELSE
	505	EXIT
	506	ENDIF
	507	ENDDO
	508
	509	!
	510	!-- Output of handling of MPI operations
	511	IF ( collective_wait ) THEN
	512	WRITE ( 18, 103 )
	513	ELSE
	514	WRITE ( 18, 104 )
	515	ENDIF
	516	IF ( cpu_log_barrierwait ) WRITE ( 18, 111 )
	517	IF ( synchronous_exchange ) THEN
	518	WRITE ( 18, 105 )
	519	ELSE
	520	WRITE ( 18, 106 )
	521	ENDIF
	522
	523	!
	524	!-- Empty lines in order to create a gap to the results of the model
	525	!-- continuation runs
	526	WRITE ( 18, 107 )
	527
	528	!
	529	!-- Unit 18 is not needed anymore
	530	CALL close_file( 18 )
	531
	532	ENDIF
	533
	534
	535	100 FORMAT (A/11('-')//'CPU measures for ',I5,' PEs (',I5,'(x) * ',I5,'(y', &
	536	&') tasks *',I5,' threads):'// &
	537	'gridpoints (x/y/z): ',20X,I5,' * ',I5,' * ',I5/ &
	538	'nr of timesteps: ',22X,I6/ &
	539	'cpu time per grid point and timestep: ',5X,F8.5,' * 10**-6 s')
	540
	541	101 FORMAT (/'special measures:'/ &
	542	&'-----------------------------------------------------------', &
	543	&'--------------------')
	544
	545	102 FORMAT (A20,2X,F9.3,2X,F7.2,1X,I7,3(1X,F9.3))
	546	103 FORMAT (/'Barriers are set in front of collective operations')
	547	104 FORMAT (/'No barriers are set in front of collective operations')
	548	105 FORMAT (/'Exchange of ghostpoints via MPI_SENDRCV')
	549	106 FORMAT (/'Exchange of ghostpoints via MPI_ISEND/MPI_IRECV')
	550	107 FORMAT (//)
	551	108 FORMAT ('Accelerator boards per node: ',14X,I2)
	552	109 FORMAT ('Accelerator boards: ',23X,I2)
	553	110 FORMAT ('----------------------------------------------------------', &
	554	&'------------'//&
	555	&'place: mean counts min ', &
	556	&' max rms'/ &
	557	&' sec. % sec. ', &
	558	&' sec. sec.'/ &
	559	&'-----------------------------------------------------------', &
	560	&'-------------------')
	561	111 FORMAT (/'Barriers are set at beginning (start/continue) of measurements')
	562
	563	END SUBROUTINE cpu_statistics
	564
	565	END MODULE cpulog

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