Home

Context Navigation

source: palm/trunk/SOURCE/cpulog_mod.f90 @ 2993

Last change on this file since 2993 was 2932, checked in by maronga, 7 years ago
renamed all Fortran NAMELISTS
Property svn:keywords set to `Id`
File size: 22.1 KB

Line
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 1997-2018 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: cpulog_mod.f90 2932 2018-03-26 09:39:22Z raasch $
27	! renamed d3par to runtime_parameters
28	!
29	! 2718 2018-01-02 08:49:38Z maronga
30	! Corrected "Former revisions" section
31	!
32	! 2696 2017-12-14 17:12:51Z kanani
33	! Change in file header (GPL part)
34	!
35	! 2266 2017-06-09 09:27:21Z raasch
36	! bugfix: cpu-time per grid point is now calculated using ngp_3d in order to
37	! avoid integer overflow,
38	! some re-formatting
39	!
40	! 2119 2017-01-17 16:51:50Z raasch
41	!
42	! 2118 2017-01-17 16:38:49Z raasch
43	! OpenACC relevant code removed
44	!
45	! 2000 2016-08-20 18:09:15Z knoop
46	! Forced header and separation lines into 80 columns
47	!
48	! 1931 2016-06-10 12:06:59Z suehring
49	! Adjustment in character length and format statement
50	!
51	! 1850 2016-04-08 13:29:27Z maronga
52	! Module renamed
53	!
54	!
55	! 1808 2016-04-05 19:44:00Z raasch
56	! cpu measurements are done with standard FORTRAN routine on every machine
57	!
58	! 1682 2015-10-07 23:56:08Z knoop
59	! Code annotations made doxygen readable
60	!
61	! 1402 2014-05-09 14:25:13Z raasch
62	! location messages added
63	!
64	! 1369 2014-04-24 05:57:38Z raasch
65	! routine description added
66	!
67	! 1353 2014-04-08 15:21:23Z heinze
68	! REAL constants provided with KIND-attribute
69	!
70	! 1322 2014-03-20 16:38:49Z raasch
71	! REAL functions provided with KIND-attribute
72	!
73	! 1320 2014-03-20 08:40:49Z raasch
74	! ONLY-attribute added to USE-statements,
75	! kind-parameters added to all INTEGER and REAL declaration statements,
76	! kinds are defined in new module kinds,
77	! revision history before 2012 removed,
78	! comment fields (!:) to be used for variable explanations added to
79	! all variable declaration statements
80	!
81	! 1318 2014-03-17 13:35:16Z raasch
82	! former files/routines cpu_log and cpu_statistics combined to one module,
83	! which also includes the former data module cpulog from the modules-file
84	!
85	! 1036 2012-10-22 13:43:42Z raasch
86	! code put under GPL (PALM 3.9)
87	!
88	! Revision 1.1 1997/07/24 11:12:29 raasch
89	! Initial revision
90	!
91	!
92	! Description:
93	! ------------
94	!> CPU-time measurements for any program part whatever. Results of the
95	!> measurements are output at the end of the run in local file CPU_MEASURES.
96	!>
97	!> To measure the CPU-time (better to say the wallclock time) of a specific code
98	!> segment, two calls of cpu_log have to be used as brackets in front and at the
99	!> end of the segment:
100	!>
101	!> CALL cpu_log( log_point(n), 'any identifier', 'start' )
102	!> ... code segment ...
103	!> CALL cpu_log( log_point(n), 'any identifier', 'stop' )
104	!>
105	!> Parts of the code segment can be excluded from the measurement by additional
106	!> call of cpu_log:
107	!>
108	!> ... first segment to be measured
109	!> CALL cpu_log( log_point(n), 'any identifier', 'pause' )
110	!> ... oart of segment to be excluded from measurement
111	!> CALL cpu_log( log_point(n), 'any identifier', 'continue' )
112	!> ... second segment to be mesasured
113	!>
114	!> n is an INTEGER within the interval [1,100] defining the id of the specific
115	!> code segment, 'any identifier' is a string describing the code segment to be
116	!> measured. It can be freely chosen and results will appear under this name in
117	!> file CPU_MEASURES. ids can only be used once. If you like to do a
118	!> measurement of a new part of the code, please look for an id which is unused
119	!> ao far.
120	!>
121	!> runtime_parameters-parameter cpu_log_barrierwait can be used to set an MPI
122	!> barrier at the beginning of the measurement (modus 'start' or 'continue'),
123	!> to avoid that idle times (due to MPI calls in the code segment, which are
124	!> waiting for other processes to be finished) affect the measurements.
125	!> If barriers shall not be used at all, a fourth, optional parameter has to be
126	!> given:
127	!>
128	!> CALL cpu_log( ..., ..., 'start', cpu_log_nowait )
129	!>
130	!> Variable log_point should be used for non-overlapping code segments, and they
131	!> should sum up to the total cpu-time required by the complete run.
132	!> Variable log_point_s can be used for any other special (s) measurements.
133	!------------------------------------------------------------------------------!
134	MODULE cpulog
135
136
137	USE control_parameters, &
138	ONLY: message_string, nr_timesteps_this_run, run_description_header, &
139	synchronous_exchange
140
141	USE indices, &
142	ONLY: ngp_3d, nx, ny, nz
143
144	USE kinds
145
146	USE pegrid
147
148	IMPLICIT NONE
149
150	PRIVATE
151	PUBLIC cpu_log, cpu_log_barrierwait, cpu_log_nowait, cpu_statistics, &
152	initial_wallclock_time, log_point, log_point_s
153
154	INTERFACE cpu_log
155	MODULE PROCEDURE cpu_log
156	END INTERFACE cpu_log
157
158	INTERFACE cpu_statistics
159	MODULE PROCEDURE cpu_statistics
160	END INTERFACE cpu_statistics
161
162	INTEGER(iwp), PARAMETER :: cpu_log_continue = 0 !<
163	INTEGER(iwp), PARAMETER :: cpu_log_pause = 1 !<
164	INTEGER(iwp), PARAMETER :: cpu_log_start = 2 !<
165	INTEGER(iwp), PARAMETER :: cpu_log_stop = 3 !<
166
167	LOGICAL :: cpu_log_barrierwait = .FALSE. !<
168	LOGICAL, PARAMETER :: cpu_log_nowait = .FALSE. !<
169
170	REAL(wp) :: initial_wallclock_time !<
171
172	TYPE logpoint
173	REAL(wp) :: isum !<
174	REAL(wp) :: ivect !<
175	REAL(wp) :: mean !<
176	REAL(wp) :: mtime !<
177	REAL(wp) :: mtimevec !<
178	REAL(wp) :: sum !<
179	REAL(wp) :: vector !<
180	INTEGER(iwp) :: counts !<
181	CHARACTER (LEN=25) :: place !<
182	END TYPE logpoint
183
184	TYPE(logpoint), DIMENSION(100) :: log_point = logpoint( 0.0_wp, 0.0_wp, &
185	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
186	0, ' ' ), &
187	log_point_s = logpoint( 0.0_wp, 0.0_wp, &
188	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
189	0, ' ' )
190
191	SAVE
192
193	CONTAINS
194
195	!------------------------------------------------------------------------------!
196	! Description:
197	! ------------
198	!> @todo Missing subroutine description.
199	!------------------------------------------------------------------------------!
200	SUBROUTINE cpu_log( log_event, place, modus, barrierwait )
201
202	IMPLICIT NONE
203
204	CHARACTER (LEN=*) :: modus !<
205	CHARACTER (LEN=*) :: place !<
206
207	LOGICAL :: wait_allowed !<
208	LOGICAL, OPTIONAL :: barrierwait !<
209	LOGICAL, SAVE :: first = .TRUE. !<
210
211	REAL(wp) :: mtime = 0.0_wp !<
212	REAL(wp) :: mtimevec = 0.0_wp !<
213	TYPE(logpoint) :: log_event !<
214
215	INTEGER(idp) :: count !<
216	INTEGER(idp) :: count_rate !<
217
218
219	!
220	!-- Initialize and check, respectively, point of measurement
221	IF ( log_event%place == ' ' ) THEN
222	log_event%place = place
223	ELSEIF ( log_event%place /= place ) THEN
224	WRITE( message_string, * ) 'wrong argument & expected: ', &
225	TRIM(log_event%place), ' given: ', TRIM( place )
226	CALL message( 'cpu_log', 'PA0174', 1, 2, 0, 6, 0 )
227	ENDIF
228
229	!
230	!-- Determine, if barriers are allowed to set
231	IF ( PRESENT( barrierwait ) ) THEN
232	wait_allowed = barrierwait
233	ELSE
234	wait_allowed = .TRUE.
235	ENDIF
236
237	!
238	!-- MPI barrier, if requested, in order to avoid measuring wait times
239	!-- caused by MPI routines waiting for other MPI routines of other
240	!-- PEs that have not yet finished
241	#if defined( __parallel )
242	IF ( cpu_log_barrierwait .AND. wait_allowed .AND. &
243	( modus == 'start' .OR. modus == 'continue' ) ) THEN
244	CALL MPI_BARRIER( comm2d, ierr )
245	ENDIF
246	#endif
247
248	!
249	!-- Take current time
250	CALL SYSTEM_CLOCK( count, count_rate )
251	mtime = REAL( count, KIND=wp ) / REAL( count_rate, KIND=wp )
252
253	!
254	!-- Start, stop or pause measurement
255	IF ( modus == 'start' .OR. modus == 'continue' ) THEN
256	log_event%mtime = mtime
257	log_event%mtimevec = mtimevec
258	ELSEIF ( modus == 'pause' ) THEN
259	IF ( ( mtime - log_event%mtime ) < 0.0 .AND. first ) THEN
260	WRITE( message_string, * ) 'negative time interval occured', &
261	' &PE',myid,' L=PAUSE "',TRIM(log_event%place), &
262	'" new=', mtime,' last=',log_event%mtime
263	CALL message( 'cpu_log', 'PA0176', 0, 1, -1, 6, 0 )
264	first = .FALSE.
265	ENDIF
266	log_event%isum = log_event%isum + mtime - log_event%mtime
267	log_event%ivect = log_event%ivect + mtimevec - log_event%mtimevec
268	ELSEIF ( modus == 'stop' ) THEN
269	IF ( ( mtime - log_event%mtime + log_event%isum ) < 0.0 .AND. &
270	first ) THEN
271	WRITE( message_string, * ) 'negative time interval occured', &
272	' &PE',myid,' L=STOP "',TRIM(log_event%place),'" new=', &
273	mtime,' last=',log_event%mtime,' isum=',log_event%isum
274	CALL message( 'cpu_log', 'PA0177', 0, 1, -1, 6, 0 )
275	first = .FALSE.
276	ENDIF
277	log_event%mtime = mtime - log_event%mtime + log_event%isum
278	log_event%mtimevec = mtimevec - log_event%mtimevec + log_event%ivect
279	log_event%sum = log_event%sum + log_event%mtime
280	IF ( log_event%sum < 0.0 .AND. first ) THEN
281	WRITE( message_string, * ) 'negative time interval occured', &
282	' &PE',myid,' L=STOP "',TRIM(log_event%place),'" sum=', &
283	log_event%sum,' mtime=',log_event%mtime
284	CALL message( 'cpu_log', 'PA0178', 0, 1, -1, 6, 0 )
285	first = .FALSE.
286	ENDIF
287	log_event%vector = log_event%vector + log_event%mtimevec
288	log_event%counts = log_event%counts + 1
289	log_event%isum = 0.0_wp
290	log_event%ivect = 0.0_wp
291	ELSE
292	message_string = 'unknown modus of time measurement: ' // &
293	TRIM( modus )
294	CALL message( 'cpu_log', 'PA0179', 0, 1, -1, 6, 0 )
295	ENDIF
296
297	END SUBROUTINE cpu_log
298
299
300	!------------------------------------------------------------------------------!
301	! Description:
302	! ------------
303	!> Analysis and output of the cpu-times measured. All PE results are collected
304	!> on PE0 in order to calculate the mean cpu-time over all PEs and other
305	!> statistics. The output is sorted according to the amount of cpu-time consumed
306	!> and output on PE0.
307	!------------------------------------------------------------------------------!
308
309	SUBROUTINE cpu_statistics
310
311	IMPLICIT NONE
312
313	INTEGER(iwp) :: i !<
314	INTEGER(iwp) :: ii(1) !<
315	INTEGER(iwp) :: iii !<
316	INTEGER(iwp) :: sender !<
317	REAL(wp) :: average_cputime !<
318	REAL(wp), SAVE :: norm = 1.0_wp !<
319	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_max !<
320	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_min !<
321	REAL(wp), DIMENSION(:), ALLOCATABLE :: pe_rms !<
322	REAL(wp), DIMENSION(:), ALLOCATABLE :: sum !<
323	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: pe_log_points !<
324
325
326	CALL location_message( 'calculating cpu statistics', .FALSE. )
327
328	!
329	!-- Compute cpu-times in seconds
330	log_point%mtime = log_point%mtime / norm
331	log_point%sum = log_point%sum / norm
332	log_point%vector = log_point%vector / norm
333	WHERE ( log_point%counts /= 0 )
334	log_point%mean = log_point%sum / log_point%counts
335	END WHERE
336
337
338	!
339	!-- Collect cpu-times from all PEs and calculate statistics
340	IF ( myid == 0 ) THEN
341	!
342	!-- Allocate and initialize temporary arrays needed for statistics
343	ALLOCATE( pe_max( SIZE( log_point ) ), pe_min( SIZE( log_point ) ), &
344	pe_rms( SIZE( log_point ) ), &
345	pe_log_points( SIZE( log_point ), 0:numprocs-1 ) )
346	pe_min = log_point%sum
347	pe_max = log_point%sum ! need to be set in case of 1 PE
348	pe_rms = 0.0_wp
349
350	#if defined( __parallel )
351	!
352	!-- Receive data from all PEs
353	DO i = 1, numprocs-1
354	CALL MPI_RECV( pe_max(1), SIZE( log_point ), MPI_REAL, &
355	i, i, comm2d, status, ierr )
356	sender = status(MPI_SOURCE)
357	pe_log_points(:,sender) = pe_max
358	ENDDO
359	pe_log_points(:,0) = log_point%sum ! Results from PE0
360	!
361	!-- Calculate mean of all PEs, store it on log_point%sum
362	!-- and find minimum and maximum
363	DO iii = 1, SIZE( log_point )
364	DO i = 1, numprocs-1
365	log_point(iii)%sum = log_point(iii)%sum + pe_log_points(iii,i)
366	pe_min(iii) = MIN( pe_min(iii), pe_log_points(iii,i) )
367	pe_max(iii) = MAX( pe_max(iii), pe_log_points(iii,i) )
368	ENDDO
369	log_point(iii)%sum = log_point(iii)%sum / numprocs
370	!
371	!-- Calculate rms
372	DO i = 0, numprocs-1
373	pe_rms(iii) = pe_rms(iii) + ( &
374	pe_log_points(iii,i) - log_point(iii)%sum &
375	)**2
376	ENDDO
377	pe_rms(iii) = SQRT( pe_rms(iii) / numprocs )
378	ENDDO
379	ELSE
380	!
381	!-- Send data to PE0 (pe_max is used as temporary storage to send
382	!-- the data in order to avoid sending the data type log)
383	ALLOCATE( pe_max( SIZE( log_point ) ) )
384	pe_max = log_point%sum
385	CALL MPI_SEND( pe_max(1), SIZE( log_point ), MPI_REAL, 0, myid, &
386	comm2d, ierr )
387	#endif
388
389	ENDIF
390
391	!
392	!-- Write cpu-times
393	IF ( myid == 0 ) THEN
394	!
395	!-- Re-store sums
396	ALLOCATE( sum( SIZE( log_point ) ) )
397	WHERE ( log_point%counts /= 0 )
398	sum = log_point%sum
399	ELSEWHERE
400	sum = -1.0_wp
401	ENDWHERE
402
403	!
404	!-- Get total time in order to calculate CPU-time per gridpoint and
405	!-- timestep
406	IF ( nr_timesteps_this_run /= 0 ) THEN
407	average_cputime = log_point(1)%sum / REAL( ngp_3d(0), KIND=wp ) / &
408	REAL( nr_timesteps_this_run, KIND=wp ) * 1E6_wp
409	! in micro-sec
410	ELSE
411	average_cputime = -1.0_wp
412	ENDIF
413
414	!
415	!-- Write cpu-times sorted by size
416	CALL check_open( 18 )
417	#if defined( __parallel )
418	WRITE ( 18, 100 ) TRIM( run_description_header ), &
419	numprocs * threads_per_task, pdims(1), pdims(2), &
420	threads_per_task, nx+1, ny+1, nz, &
421	nr_timesteps_this_run, average_cputime
422
423	WRITE ( 18, 110 )
424	#else
425	WRITE ( 18, 100 ) TRIM( run_description_header ), &
426	numprocs * threads_per_task, 1, 1, &
427	threads_per_task, nx+1, ny+1, nz, &
428	nr_timesteps_this_run, average_cputime
429
430	WRITE ( 18, 110 )
431	#endif
432	DO
433	ii = MAXLOC( sum )
434	i = ii(1)
435	IF ( sum(i) /= -1.0_wp ) THEN
436	WRITE ( 18, 102 ) &
437	log_point(i)%place, log_point(i)%sum, &
438	log_point(i)%sum / log_point(1)%sum * 100.0_wp, &
439	log_point(i)%counts, pe_min(i), pe_max(i), pe_rms(i)
440	sum(i) = -1.0_wp
441	ELSE
442	EXIT
443	ENDIF
444	ENDDO
445	ENDIF
446
447
448	!
449	!-- The same procedure again for the individual measurements.
450	!
451	!-- Compute cpu-times in seconds
452	log_point_s%mtime = log_point_s%mtime / norm
453	log_point_s%sum = log_point_s%sum / norm
454	log_point_s%vector = log_point_s%vector / norm
455	WHERE ( log_point_s%counts /= 0 )
456	log_point_s%mean = log_point_s%sum / log_point_s%counts
457	END WHERE
458
459	!
460	!-- Collect cpu-times from all PEs and calculate statistics
461	#if defined( __parallel )
462	!
463	!-- Set barrier in order to avoid that PE0 receives log_point_s-data
464	!-- while still busy with receiving log_point-data (see above)
465	CALL MPI_BARRIER( comm2d, ierr )
466	#endif
467	IF ( myid == 0 ) THEN
468	!
469	!-- Initialize temporary arrays needed for statistics
470	pe_min = log_point_s%sum
471	pe_max = log_point_s%sum ! need to be set in case of 1 PE
472	pe_rms = 0.0_wp
473
474	#if defined( __parallel )
475	!
476	!-- Receive data from all PEs
477	DO i = 1, numprocs-1
478	CALL MPI_RECV( pe_max(1), SIZE( log_point ), MPI_REAL, &
479	MPI_ANY_SOURCE, MPI_ANY_TAG, comm2d, status, ierr )
480	sender = status(MPI_SOURCE)
481	pe_log_points(:,sender) = pe_max
482	ENDDO
483	pe_log_points(:,0) = log_point_s%sum ! Results from PE0
484	!
485	!-- Calculate mean of all PEs, store it on log_point_s%sum
486	!-- and find minimum and maximum
487	DO iii = 1, SIZE( log_point )
488	DO i = 1, numprocs-1
489	log_point_s(iii)%sum = log_point_s(iii)%sum + &
490	pe_log_points(iii,i)
491	pe_min(iii) = MIN( pe_min(iii), pe_log_points(iii,i) )
492	pe_max(iii) = MAX( pe_max(iii), pe_log_points(iii,i) )
493	ENDDO
494	log_point_s(iii)%sum = log_point_s(iii)%sum / numprocs
495	!
496	!-- Calculate rms
497	DO i = 0, numprocs-1
498	pe_rms(iii) = pe_rms(iii) + ( &
499	pe_log_points(iii,i) - log_point_s(iii)%sum &
500	)**2
501	ENDDO
502	pe_rms(iii) = SQRT( pe_rms(iii) / numprocs )
503	ENDDO
504	ELSE
505	!
506	!-- Send data to PE0 (pe_max is used as temporary storage to send
507	!-- the data in order to avoid sending the data type log)
508	pe_max = log_point_s%sum
509	CALL MPI_SEND( pe_max(1), SIZE( log_point ), MPI_REAL, 0, 0, comm2d, &
510	ierr )
511	#endif
512
513	ENDIF
514
515	!
516	!-- Write cpu-times
517	IF ( myid == 0 ) THEN
518	!
519	!-- Re-store sums
520	WHERE ( log_point_s%counts /= 0 )
521	sum = log_point_s%sum
522	ELSEWHERE
523	sum = -1.0_wp
524	ENDWHERE
525
526	!
527	!-- Write cpu-times sorted by size
528	WRITE ( 18, 101 )
529	DO
530	ii = MAXLOC( sum )
531	i = ii(1)
532	IF ( sum(i) /= -1.0_wp ) THEN
533	WRITE ( 18, 102 ) &
534	log_point_s(i)%place, log_point_s(i)%sum, &
535	log_point_s(i)%sum / log_point(1)%sum * 100.0_wp, &
536	log_point_s(i)%counts, pe_min(i), pe_max(i), pe_rms(i)
537	sum(i) = -1.0_wp
538	ELSE
539	EXIT
540	ENDIF
541	ENDDO
542
543	!
544	!-- Output of handling of MPI operations
545	IF ( collective_wait ) THEN
546	WRITE ( 18, 103 )
547	ELSE
548	WRITE ( 18, 104 )
549	ENDIF
550	IF ( cpu_log_barrierwait ) WRITE ( 18, 111 )
551	IF ( synchronous_exchange ) THEN
552	WRITE ( 18, 105 )
553	ELSE
554	WRITE ( 18, 106 )
555	ENDIF
556
557	!
558	!-- Empty lines in order to create a gap to the results of the model
559	!-- continuation runs
560	WRITE ( 18, 107 )
561
562	!
563	!-- Unit 18 is not needed anymore
564	CALL close_file( 18 )
565
566	ENDIF
567
568	CALL location_message( 'finished', .TRUE. )
569
570	100 FORMAT (A/11('-')//'CPU measures for ',I5,' PEs (',I5,'(x) * ',I5,'(y', &
571	&') tasks *',I5,' threads):'// &
572	'gridpoints (x/y/z): ',20X,I5,' * ',I5,' * ',I5/ &
573	'nr of timesteps: ',22X,I6/ &
574	'cpu time per grid point and timestep: ',5X,F8.5,' * 10**-6 s')
575
576	101 FORMAT (/'special measures:'/ &
577	&'-----------------------------------------------------------', &
578	&'------------------------')
579
580	102 FORMAT (A25,2X,F9.3,2X,F7.2,1X,I7,3(1X,F9.3))
581	103 FORMAT (/'Barriers are set in front of collective operations')
582	104 FORMAT (/'No barriers are set in front of collective operations')
583	105 FORMAT (/'Exchange of ghostpoints via MPI_SENDRCV')
584	106 FORMAT (/'Exchange of ghostpoints via MPI_ISEND/MPI_IRECV')
585	107 FORMAT (//)
586	110 FORMAT ('-------------------------------------------------------------', &
587	&'---------'//&
588	&'place: mean counts min ',&
589	&' max rms'/ &
590	&' sec. % sec. ', &
591	&' sec. sec.'/ &
592	&'-----------------------------------------------------------', &
593	&'------------------------')
594	111 FORMAT (/'Barriers are set at beginning (start/continue) of measurements')
595
596	END SUBROUTINE cpu_statistics
597
598	END MODULE cpulog

Note: See TracBrowser for help on using the repository browser.

Download in other formats:

| Impressum | ©Leibniz Universität Hannover |