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source: palm/trunk/SOURCE/cpulog_mod.f90 @ 4435

Last change on this file since 4435 was 4429, checked in by raasch, 5 years ago
serial (non-MPI) test case added, several bugfixes for the serial mode
Property svn:keywords set to `Id`
File size: 21.2 KB

Rev	Line
[1850]	1	!> @file cpulog_mod.f90
[2000]	2	!------------------------------------------------------------------------------!
[2696]	3	! This file is part of the PALM model system.
[1036]	4	!
[2000]	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.
[1036]	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	!
[4360]	17	! Copyright 1997-2020 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[254]	20	! Current revisions:
[1]	21	! -----------------
[1403]	22	!
[3049]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: cpulog_mod.f90 4429 2020-02-27 15:24:30Z raasch $
[4429]	27	! bugfix: cpp-directives added for serial mode
	28	!
	29	! 4378 2020-01-16 13:22:48Z Giersch
[4378]	30	! Format of rms output changed to allow values >= 100
	31	!
	32	! 4360 2020-01-07 11:25:50Z suehring
[4182]	33	! Corrected "Former revisions" section
	34	!
	35	! 4015 2019-06-05 13:25:35Z raasch
[4015]	36	! all reals changed to double precision in order to work with 32-bit working precision,
	37	! otherwise calculated time intervals would mostly give zero
	38	!
	39	! 3885 2019-04-11 11:29:34Z kanani
[3885]	40	! Changes related to global restructuring of location messages and introduction
	41	! of additional debug messages
	42	!
	43	! 3655 2019-01-07 16:51:22Z knoop
[3483]	44	! output format limited to a maximum line length of 80
[2716]	45	!
[4182]	46	! Revision 1.1 1997/07/24 11:12:29 raasch
	47	! Initial revision
	48	!
	49	!
[1]	50	! Description:
	51	! ------------
[1682]	52	!> CPU-time measurements for any program part whatever. Results of the
	53	!> measurements are output at the end of the run in local file CPU_MEASURES.
	54	!>
	55	!> To measure the CPU-time (better to say the wallclock time) of a specific code
	56	!> segment, two calls of cpu_log have to be used as brackets in front and at the
	57	!> end of the segment:
	58	!>
	59	!> CALL cpu_log( log_point(n), 'any identifier', 'start' )
	60	!> ... code segment ...
	61	!> CALL cpu_log( log_point(n), 'any identifier', 'stop' )
	62	!>
	63	!> Parts of the code segment can be excluded from the measurement by additional
	64	!> call of cpu_log:
	65	!>
	66	!> ... first segment to be measured
	67	!> CALL cpu_log( log_point(n), 'any identifier', 'pause' )
	68	!> ... oart of segment to be excluded from measurement
	69	!> CALL cpu_log( log_point(n), 'any identifier', 'continue' )
	70	!> ... second segment to be mesasured
	71	!>
	72	!> n is an INTEGER within the interval [1,100] defining the id of the specific
	73	!> code segment, 'any identifier' is a string describing the code segment to be
	74	!> measured. It can be freely chosen and results will appear under this name in
	75	!> file CPU_MEASURES. ids can only be used once. If you like to do a
	76	!> measurement of a new part of the code, please look for an id which is unused
	77	!> ao far.
	78	!>
[2932]	79	!> runtime_parameters-parameter cpu_log_barrierwait can be used to set an MPI
	80	!> barrier at the beginning of the measurement (modus 'start' or 'continue'),
	81	!> to avoid that idle times (due to MPI calls in the code segment, which are
[1682]	82	!> waiting for other processes to be finished) affect the measurements.
	83	!> If barriers shall not be used at all, a fourth, optional parameter has to be
	84	!> given:
	85	!>
	86	!> CALL cpu_log( ..., ..., 'start', cpu_log_nowait )
	87	!>
	88	!> Variable log_point should be used for non-overlapping code segments, and they
	89	!> should sum up to the total cpu-time required by the complete run.
	90	!> Variable log_point_s can be used for any other special (s) measurements.
[3]	91	!------------------------------------------------------------------------------!
[1682]	92	MODULE cpulog
	93
[1]	94
[4015]	95	USE control_parameters, &
	96	ONLY: message_string, nr_timesteps_this_run, run_description_header, synchronous_exchange
[1320]	97
[4015]	98	USE indices, &
[2266]	99	ONLY: ngp_3d, nx, ny, nz
[1320]	100
	101	USE kinds
	102
[1]	103	USE pegrid
	104
	105	IMPLICIT NONE
	106
[1318]	107	PRIVATE
[4015]	108	PUBLIC cpu_log, cpu_log_barrierwait, cpu_log_nowait, cpu_statistics, initial_wallclock_time, &
	109	log_point, log_point_s
[1]	110
[1318]	111	INTERFACE cpu_log
	112	MODULE PROCEDURE cpu_log
	113	END INTERFACE cpu_log
	114
	115	INTERFACE cpu_statistics
	116	MODULE PROCEDURE cpu_statistics
	117	END INTERFACE cpu_statistics
	118
[1682]	119	INTEGER(iwp), PARAMETER :: cpu_log_continue = 0 !<
	120	INTEGER(iwp), PARAMETER :: cpu_log_pause = 1 !<
	121	INTEGER(iwp), PARAMETER :: cpu_log_start = 2 !<
	122	INTEGER(iwp), PARAMETER :: cpu_log_stop = 3 !<
[1318]	123
[1682]	124	LOGICAL :: cpu_log_barrierwait = .FALSE. !<
	125	LOGICAL, PARAMETER :: cpu_log_nowait = .FALSE. !<
[1318]	126
[4015]	127	REAL(dp) :: initial_wallclock_time !<
[1318]	128
	129	TYPE logpoint
[4015]	130	REAL(dp) :: isum !<
	131	REAL(dp) :: ivect !<
	132	REAL(dp) :: mean !<
	133	REAL(dp) :: mtime !<
	134	REAL(dp) :: mtimevec !<
	135	REAL(dp) :: sum !<
	136	REAL(dp) :: vector !<
[1682]	137	INTEGER(iwp) :: counts !<
[1931]	138	CHARACTER (LEN=25) :: place !<
[1318]	139	END TYPE logpoint
	140
[4015]	141	TYPE(logpoint), DIMENSION(100) :: log_point = logpoint( 0.0_dp, 0.0_dp, 0.0_dp, 0.0_dp, &
	142	0.0_dp, 0.0_dp, 0.0_dp, 0, ' ' )
	143	TYPE(logpoint), DIMENSION(100) :: log_point_s = logpoint( 0.0_dp, 0.0_dp, 0.0_dp, 0.0_dp, &
	144	0.0_dp, 0.0_dp, 0.0_dp, 0, ' ' )
[1318]	145
	146	SAVE
	147
	148	CONTAINS
	149
[1682]	150	!------------------------------------------------------------------------------!
	151	! Description:
	152	! ------------
	153	!> @todo Missing subroutine description.
	154	!------------------------------------------------------------------------------!
[1318]	155	SUBROUTINE cpu_log( log_event, place, modus, barrierwait )
	156
	157	IMPLICIT NONE
	158
[1682]	159	CHARACTER (LEN=*) :: modus !<
	160	CHARACTER (LEN=*) :: place !<
[1320]	161
[1682]	162	LOGICAL :: wait_allowed !<
	163	LOGICAL, OPTIONAL :: barrierwait !<
	164	LOGICAL, SAVE :: first = .TRUE. !<
[1320]	165
[4015]	166	REAL(dp) :: mtime = 0.0_dp !<
	167	REAL(dp) :: mtimevec = 0.0_dp !<
[1682]	168	TYPE(logpoint) :: log_event !<
[1318]	169
[1682]	170	INTEGER(idp) :: count !<
	171	INTEGER(idp) :: count_rate !<
[1]	172
	173
	174	!
[1318]	175	!-- Initialize and check, respectively, point of measurement
	176	IF ( log_event%place == ' ' ) THEN
	177	log_event%place = place
	178	ELSEIF ( log_event%place /= place ) THEN
[4015]	179	WRITE( message_string, * ) 'wrong argument expected: ', &
	180	TRIM(log_event%place), ' given: ', TRIM( place )
[1318]	181	CALL message( 'cpu_log', 'PA0174', 1, 2, 0, 6, 0 )
	182	ENDIF
[1]	183
	184	!
[1318]	185	!-- Determine, if barriers are allowed to set
	186	IF ( PRESENT( barrierwait ) ) THEN
	187	wait_allowed = barrierwait
	188	ELSE
	189	wait_allowed = .TRUE.
	190	ENDIF
	191
	192	!
	193	!-- MPI barrier, if requested, in order to avoid measuring wait times
	194	!-- caused by MPI routines waiting for other MPI routines of other
	195	!-- PEs that have not yet finished
	196	#if defined( __parallel )
[4015]	197	IF ( cpu_log_barrierwait .AND. wait_allowed .AND. &
[1318]	198	( modus == 'start' .OR. modus == 'continue' ) ) THEN
	199	CALL MPI_BARRIER( comm2d, ierr )
	200	ENDIF
	201	#endif
	202
	203	!
	204	!-- Take current time
	205	CALL SYSTEM_CLOCK( count, count_rate )
[4015]	206	mtime = REAL( count, KIND=dp ) / REAL( count_rate, KIND=dp )
[1]	207
	208	!
[1318]	209	!-- Start, stop or pause measurement
	210	IF ( modus == 'start' .OR. modus == 'continue' ) THEN
	211	log_event%mtime = mtime
	212	log_event%mtimevec = mtimevec
	213	ELSEIF ( modus == 'pause' ) THEN
	214	IF ( ( mtime - log_event%mtime ) < 0.0 .AND. first ) THEN
[4015]	215	WRITE( message_string, * ) 'negative time interval occured', &
	216	'&PE',myid,' L=PAUSE "',TRIM(log_event%place), &
	217	'" new=', mtime,' last=',log_event%mtime
[1318]	218	CALL message( 'cpu_log', 'PA0176', 0, 1, -1, 6, 0 )
	219	first = .FALSE.
	220	ENDIF
	221	log_event%isum = log_event%isum + mtime - log_event%mtime
	222	log_event%ivect = log_event%ivect + mtimevec - log_event%mtimevec
	223	ELSEIF ( modus == 'stop' ) THEN
[4015]	224	IF ( ( mtime - log_event%mtime + log_event%isum ) < 0.0 .AND. first ) THEN
	225	WRITE( message_string, * ) 'negative time interval occured', &
	226	'&PE',myid,' L=STOP "',TRIM(log_event%place),'" new=', &
	227	mtime,' last=',log_event%mtime,' isum=',log_event%isum
[1318]	228	CALL message( 'cpu_log', 'PA0177', 0, 1, -1, 6, 0 )
	229	first = .FALSE.
	230	ENDIF
	231	log_event%mtime = mtime - log_event%mtime + log_event%isum
	232	log_event%mtimevec = mtimevec - log_event%mtimevec + log_event%ivect
	233	log_event%sum = log_event%sum + log_event%mtime
	234	IF ( log_event%sum < 0.0 .AND. first ) THEN
[4015]	235	WRITE( message_string, * ) 'negative time interval occured', &
	236	'&PE',myid,' L=STOP "',TRIM(log_event%place),'" sum=', &
	237	log_event%sum,' mtime=',log_event%mtime
[1318]	238	CALL message( 'cpu_log', 'PA0178', 0, 1, -1, 6, 0 )
	239	first = .FALSE.
	240	ENDIF
	241	log_event%vector = log_event%vector + log_event%mtimevec
	242	log_event%counts = log_event%counts + 1
[4015]	243	log_event%isum = 0.0_dp
	244	log_event%ivect = 0.0_dp
[1318]	245	ELSE
[4015]	246	message_string = 'unknown modus of time measurement: ' // TRIM( modus )
[1318]	247	CALL message( 'cpu_log', 'PA0179', 0, 1, -1, 6, 0 )
[1]	248	ENDIF
[1318]	249
	250	END SUBROUTINE cpu_log
	251
	252
	253	!------------------------------------------------------------------------------!
	254	! Description:
	255	! ------------
[1682]	256	!> Analysis and output of the cpu-times measured. All PE results are collected
	257	!> on PE0 in order to calculate the mean cpu-time over all PEs and other
	258	!> statistics. The output is sorted according to the amount of cpu-time consumed
	259	!> and output on PE0.
[1318]	260	!------------------------------------------------------------------------------!
[1682]	261
	262	SUBROUTINE cpu_statistics
[1318]	263
	264	IMPLICIT NONE
	265
[1682]	266	INTEGER(iwp) :: i !<
	267	INTEGER(iwp) :: ii(1) !<
[4429]	268	#if defined( __parallel )
[1682]	269	INTEGER(iwp) :: iii !<
[4429]	270	INTEGER(iwp) :: sender !<
	271	#endif
[4015]	272	REAL(dp) :: average_cputime !<
	273	REAL(dp), SAVE :: norm = 1.0_dp !<
	274	REAL(dp), DIMENSION(:), ALLOCATABLE :: pe_max !<
	275	REAL(dp), DIMENSION(:), ALLOCATABLE :: pe_min !<
	276	REAL(dp), DIMENSION(:), ALLOCATABLE :: pe_rms !<
	277	REAL(dp), DIMENSION(:), ALLOCATABLE :: pe_tmp !<
	278	REAL(dp), DIMENSION(:), ALLOCATABLE :: sum !<
	279	REAL(dp), DIMENSION(:,:), ALLOCATABLE :: pe_log_points !<
[1318]	280
	281
[3885]	282	CALL location_message( 'calculating cpu statistics', 'start' )
[1402]	283
[1318]	284	!
	285	!-- Compute cpu-times in seconds
	286	log_point%mtime = log_point%mtime / norm
	287	log_point%sum = log_point%sum / norm
	288	log_point%vector = log_point%vector / norm
	289	WHERE ( log_point%counts /= 0 )
	290	log_point%mean = log_point%sum / log_point%counts
	291	END WHERE
	292
	293
	294	!
	295	!-- Collect cpu-times from all PEs and calculate statistics
	296	IF ( myid == 0 ) THEN
	297	!
	298	!-- Allocate and initialize temporary arrays needed for statistics
[4015]	299	ALLOCATE( pe_max( SIZE( log_point ) ), pe_min( SIZE( log_point ) ), &
	300	pe_rms( SIZE( log_point ) ), pe_tmp( SIZE( log_point ) ), &
[1318]	301	pe_log_points( SIZE( log_point ), 0:numprocs-1 ) )
	302	pe_min = log_point%sum
	303	pe_max = log_point%sum ! need to be set in case of 1 PE
[4015]	304	pe_rms = 0.0_dp
	305	pe_tmp = 0.0_dp
[1318]	306
	307	#if defined( __parallel )
	308	!
	309	!-- Receive data from all PEs
	310	DO i = 1, numprocs-1
[4015]	311	CALL MPI_RECV( pe_tmp(1), SIZE( log_point ), MPI_DOUBLE_PRECISION, i, i, comm2d, &
	312	status, ierr )
[1318]	313	sender = status(MPI_SOURCE)
[3229]	314	pe_log_points(:,sender) = pe_tmp
[1318]	315	ENDDO
	316	pe_log_points(:,0) = log_point%sum ! Results from PE0
	317	!
	318	!-- Calculate mean of all PEs, store it on log_point%sum
	319	!-- and find minimum and maximum
	320	DO iii = 1, SIZE( log_point )
	321	DO i = 1, numprocs-1
	322	log_point(iii)%sum = log_point(iii)%sum + pe_log_points(iii,i)
	323	pe_min(iii) = MIN( pe_min(iii), pe_log_points(iii,i) )
	324	pe_max(iii) = MAX( pe_max(iii), pe_log_points(iii,i) )
	325	ENDDO
	326	log_point(iii)%sum = log_point(iii)%sum / numprocs
	327	!
	328	!-- Calculate rms
	329	DO i = 0, numprocs-1
[4015]	330	pe_rms(iii) = pe_rms(iii) + ( pe_log_points(iii,i) - log_point(iii)%sum )**2
[1318]	331	ENDDO
	332	pe_rms(iii) = SQRT( pe_rms(iii) / numprocs )
	333	ENDDO
	334	ELSE
	335	!
	336	!-- Send data to PE0 (pe_max is used as temporary storage to send
	337	!-- the data in order to avoid sending the data type log)
	338	ALLOCATE( pe_max( SIZE( log_point ) ) )
	339	pe_max = log_point%sum
[4015]	340	CALL MPI_SEND( pe_max(1), SIZE( log_point ), MPI_DOUBLE_PRECISION, 0, myid, comm2d, ierr )
[1318]	341	#endif
	342
[1]	343	ENDIF
[1318]	344
	345	!
	346	!-- Write cpu-times
	347	IF ( myid == 0 ) THEN
	348	!
	349	!-- Re-store sums
	350	ALLOCATE( sum( SIZE( log_point ) ) )
	351	WHERE ( log_point%counts /= 0 )
	352	sum = log_point%sum
	353	ELSEWHERE
[4015]	354	sum = -1.0_dp
[1318]	355	ENDWHERE
	356
	357	!
[2266]	358	!-- Get total time in order to calculate CPU-time per gridpoint and
	359	!-- timestep
[1318]	360	IF ( nr_timesteps_this_run /= 0 ) THEN
[4015]	361	average_cputime = log_point(1)%sum / REAL( ngp_3d(0), KIND=dp ) / &
	362	REAL( nr_timesteps_this_run, KIND=dp ) * 1E6_dp ! in micro-sec
[1318]	363	ELSE
[4015]	364	average_cputime = -1.0_dp
[1318]	365	ENDIF
	366
	367	!
	368	!-- Write cpu-times sorted by size
	369	CALL check_open( 18 )
	370	#if defined( __parallel )
[4015]	371	WRITE ( 18, 100 ) TRIM( run_description_header ), numprocs * threads_per_task, &
	372	pdims(1), pdims(2), threads_per_task, nx+1, ny+1, nz, &
[2266]	373	nr_timesteps_this_run, average_cputime
[1318]	374
	375	WRITE ( 18, 110 )
	376	#else
[4015]	377	WRITE ( 18, 100 ) TRIM( run_description_header ), numprocs * threads_per_task, 1, 1, &
	378	threads_per_task, nx+1, ny+1, nz, nr_timesteps_this_run, &
	379	average_cputime
[1318]	380
	381	WRITE ( 18, 110 )
	382	#endif
	383	DO
	384	ii = MAXLOC( sum )
	385	i = ii(1)
[4015]	386	IF ( sum(i) /= -1.0_dp ) THEN
	387	WRITE ( 18, 102 ) log_point(i)%place, log_point(i)%sum, &
	388	log_point(i)%sum / log_point(1)%sum * 100.0_dp, &
	389	log_point(i)%counts, pe_min(i), pe_max(i), pe_rms(i)
	390	sum(i) = -1.0_dp
[1318]	391	ELSE
	392	EXIT
	393	ENDIF
	394	ENDDO
[1]	395	ENDIF
	396
	397
[1318]	398	!
	399	!-- The same procedure again for the individual measurements.
	400	!
	401	!-- Compute cpu-times in seconds
	402	log_point_s%mtime = log_point_s%mtime / norm
	403	log_point_s%sum = log_point_s%sum / norm
	404	log_point_s%vector = log_point_s%vector / norm
	405	WHERE ( log_point_s%counts /= 0 )
	406	log_point_s%mean = log_point_s%sum / log_point_s%counts
	407	END WHERE
	408
	409	!
	410	!-- Collect cpu-times from all PEs and calculate statistics
	411	#if defined( __parallel )
	412	!
	413	!-- Set barrier in order to avoid that PE0 receives log_point_s-data
	414	!-- while still busy with receiving log_point-data (see above)
	415	CALL MPI_BARRIER( comm2d, ierr )
	416	#endif
	417	IF ( myid == 0 ) THEN
	418	!
	419	!-- Initialize temporary arrays needed for statistics
	420	pe_min = log_point_s%sum
	421	pe_max = log_point_s%sum ! need to be set in case of 1 PE
[4015]	422	pe_rms = 0.0_dp
[1318]	423
	424	#if defined( __parallel )
	425	!
	426	!-- Receive data from all PEs
	427	DO i = 1, numprocs-1
[4015]	428	CALL MPI_RECV( pe_tmp(1), SIZE( log_point ), MPI_DOUBLE_PRECISION, MPI_ANY_SOURCE, &
	429	MPI_ANY_TAG, comm2d, status, ierr )
[1318]	430	sender = status(MPI_SOURCE)
[3229]	431	pe_log_points(:,sender) = pe_tmp
[1318]	432	ENDDO
	433	pe_log_points(:,0) = log_point_s%sum ! Results from PE0
	434	!
	435	!-- Calculate mean of all PEs, store it on log_point_s%sum
	436	!-- and find minimum and maximum
	437	DO iii = 1, SIZE( log_point )
	438	DO i = 1, numprocs-1
[4015]	439	log_point_s(iii)%sum = log_point_s(iii)%sum + pe_log_points(iii,i)
[1318]	440	pe_min(iii) = MIN( pe_min(iii), pe_log_points(iii,i) )
	441	pe_max(iii) = MAX( pe_max(iii), pe_log_points(iii,i) )
	442	ENDDO
	443	log_point_s(iii)%sum = log_point_s(iii)%sum / numprocs
	444	!
	445	!-- Calculate rms
	446	DO i = 0, numprocs-1
[4015]	447	pe_rms(iii) = pe_rms(iii) + ( pe_log_points(iii,i) - log_point_s(iii)%sum )**2
[1318]	448	ENDDO
	449	pe_rms(iii) = SQRT( pe_rms(iii) / numprocs )
	450	ENDDO
	451	ELSE
	452	!
	453	!-- Send data to PE0 (pe_max is used as temporary storage to send
	454	!-- the data in order to avoid sending the data type log)
	455	pe_max = log_point_s%sum
[4015]	456	CALL MPI_SEND( pe_max(1), SIZE( log_point ), MPI_DOUBLE_PRECISION, 0, 0, comm2d, ierr )
[1318]	457	#endif
	458
	459	ENDIF
	460
	461	!
	462	!-- Write cpu-times
	463	IF ( myid == 0 ) THEN
	464	!
	465	!-- Re-store sums
	466	WHERE ( log_point_s%counts /= 0 )
	467	sum = log_point_s%sum
	468	ELSEWHERE
[4015]	469	sum = -1.0_dp
[1318]	470	ENDWHERE
	471
	472	!
	473	!-- Write cpu-times sorted by size
	474	WRITE ( 18, 101 )
	475	DO
	476	ii = MAXLOC( sum )
	477	i = ii(1)
[4015]	478	IF ( sum(i) /= -1.0_dp ) THEN
	479	WRITE ( 18, 102 ) log_point_s(i)%place, log_point_s(i)%sum, &
	480	log_point_s(i)%sum / log_point(1)%sum * 100.0_dp, &
	481	log_point_s(i)%counts, pe_min(i), pe_max(i), pe_rms(i)
	482	sum(i) = -1.0_dp
[1318]	483	ELSE
	484	EXIT
	485	ENDIF
	486	ENDDO
	487
	488	!
	489	!-- Output of handling of MPI operations
	490	IF ( collective_wait ) THEN
	491	WRITE ( 18, 103 )
	492	ELSE
	493	WRITE ( 18, 104 )
	494	ENDIF
	495	IF ( cpu_log_barrierwait ) WRITE ( 18, 111 )
	496	IF ( synchronous_exchange ) THEN
	497	WRITE ( 18, 105 )
	498	ELSE
	499	WRITE ( 18, 106 )
	500	ENDIF
	501
	502	!
	503	!-- Empty lines in order to create a gap to the results of the model
	504	!-- continuation runs
	505	WRITE ( 18, 107 )
	506
	507	!
	508	!-- Unit 18 is not needed anymore
	509	CALL close_file( 18 )
	510
	511	ENDIF
	512
[3885]	513	CALL location_message( 'calculating cpu statistics', 'finished' )
[1318]	514
[3885]	515
[4015]	516	100 FORMAT (A/11('-')//'CPU measures for ',I5,' PEs (',I5,'(x) * ',I5,'(y', &
	517	&') tasks *',I5,' threads):'// &
	518	'gridpoints (x/y/z): ',20X,I5,' * ',I5,' * ',I5/ &
	519	'nr of timesteps: ',22X,I6/ &
[1318]	520	'cpu time per grid point and timestep: ',5X,F8.5,' * 10**-6 s')
	521
	522	101 FORMAT (/'special measures:'/ &
[4015]	523	&'-----------------------------------------------------------', &
[3483]	524	&'---------------------')
[1318]	525
[4378]	526	102 FORMAT (A25,2X,F9.3,2X,F7.2,1X,I7,2(1X,F9.3),1X,F6.2)
[1318]	527	103 FORMAT (/'Barriers are set in front of collective operations')
	528	104 FORMAT (/'No barriers are set in front of collective operations')
	529	105 FORMAT (/'Exchange of ghostpoints via MPI_SENDRCV')
	530	106 FORMAT (/'Exchange of ghostpoints via MPI_ISEND/MPI_IRECV')
	531	107 FORMAT (//)
[4015]	532	110 FORMAT ('------------------------------------------------------------', &
	533	&'----------'// &
	534	&'place: mean counts ', &
	535	&' min max rms'/ &
	536	&' sec. % ', &
	537	&'sec. sec. sec.'/ &
	538	&'-----------------------------------------------------------', &
[3483]	539	&'---------------------')
[1318]	540	111 FORMAT (/'Barriers are set at beginning (start/continue) of measurements')
	541
	542	END SUBROUTINE cpu_statistics
	543
	544	END MODULE cpulog

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