Trace number 1831490

Some explanations

A solver is run under the control of another program named runsolver. runsolver is in charge of imposing the CPU time limit and the memory limit to the solver. It also monitors some information about the process. The trace of the execution of a solver is divided into four (or five) parts:
  1. SOLVER DATA
    This is the output of the solver (stdout and stderr).
    Note that some very long lines in this section may be truncated by your web browser ! In such a case, you may want to use the "Download as text" link to get the trace as a text file.

    When the --timestamp option is passed to the runsolver program, each line output by the solver is prepended with a timestamp which indicates at what time the line was output by the solver. Times are relative to the start of the program, given in seconds. The first timestamp (if present) is estimated CPU time. The last timestamp is wall clock time.

    As some 'v lines' may be very long (sometimes several megabytes), the 'v line' output by your solver may be split on several lines to help limit the size of the trace recorded in the database. In any case, the exact output of your solver is preserved in a trace file.
  2. VERIFIER DATA
    The output of the solver is piped to a verifier program which will search a value line "v " and, if found, will check that the given interpretation satisfies all constraints.
  3. CONVERSION SCRIPT DATA (Optionnal)
    When a conversion script is used, this section shows the messages that were output by the conversion script.
  4. WATCHER DATA
    This is the informations gathered by the runsolver program. It first prints the different limits. There's a first limit on CPU time set to X seconds (see the parameters in the trace). After this time has ellapsed, runsolver sends a SIGTERM and 2 seconds later a SIGKILL to the solver. For safety, there's also another limit set to X+30 seconds which will send a SIGXPU to the solver. The last limit is on the virtual memory used by the process (see the parameters in the trace).
    Every ten seconds, the runsolver process fetches the content of /proc/loadavg, /proc/pid/stat and /proc/pid/statm (see man proc) and prints it as raw data. This is only recorded in case we need to investigate the behaviour of a solver. The memory used by the solver (vsize) is also given every ten seconds.
    When the solver exits, runsolver prints some informations such as status and time. CPU usage is the ratio CPU Time/Real Time.
  5. LAUNCHER DATA
    These informations are related to the script which will launch the solver. The most important informations are the command line given to the solver, the md5sum of the different files and the dump of the /proc/cpuinfo and /proc/meminfo which provides some useful information on the computer.

Solver answer on this benchmark

Solver NameAnswerCPU timeWall clock time
SApperloT baseUNSAT 211.684 211.672

General information on the benchmark

Nameindustrial/palacios/uts/
uts-l05-ipc5-h27-unknown.cnf
MD5SUM7634252332633927f116161c1beb6151
Bench CategoryAPPLICATION (applications instances)
Best result obtained on this benchmarkUNSAT
Best CPU time to get the best result obtained on this benchmark19.684
Satisfiable
(Un)Satisfiability was proved
Number of variables93573
Number of clauses439508
Sum of the clauses size1132510
Maximum clause length403
Minimum clause length1
Number of clauses of size 1190
Number of clauses of size 2347239
Number of clauses of size 388215
Number of clauses of size 41000
Number of clauses of size 5107
Number of clauses of size over 52757

Solver Data

211.61/211.66	
211.61/211.66	s UNSATISFIABLE

Verifier Data

No possible verification on an UNSAT instance

Watcher Data

runsolver version 3.2.9 (svn:492) (c) roussel@cril.univ-artois.fr

command line: BIN/runsolver --timestamp -w /tmp/evaluation-result-1831490-1242759128/watcher-1831490-1242759128 -o /tmp/evaluation-result-1831490-1242759128/solver-1831490-1242759128 -C 10000 -W 12000 -M 1800 --output-limit 1,128 HOME/SApperloT-base -seed=772938234 HOME/instance-1831490-1242759128.cnf 

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 10000 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 10030 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 12000 seconds
Enforcing VSIZE limit (soft limit, will send SIGTERM then SIGKILL): 1843200 KiB
Enforcing VSIZE limit (hard limit, stack expansion will fail with SIGSEGV, brk() and mmap() will return ENOMEM): 1894400 KiB
Solver output will be limited to a maximum of 134217728 bytes. The first 1048576 bytes and the last 133169152 bytes will be preserved
Current StackSize limit: 10240 KiB


[startup+0 s]
/proc/loadavg: 0.00 0.00 0.00 3/64 8600
/proc/meminfo: memFree=1985288/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=4676 CPUtime=0
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 785 0 0 0 0 0 0 0 18 0 1 0 303946306 4788224 769 1992294400 134512640 135674940 4294956208 18446744073709551615 134545020 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 1169 774 88 283 0 883 0

[startup+0.070891 s]
/proc/loadavg: 0.00 0.00 0.00 3/64 8600
/proc/meminfo: memFree=1985288/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=10032 CPUtime=0.06
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 1793 0 0 0 6 0 0 0 18 0 1 0 303946306 10272768 1777 1992294400 134512640 135674940 4294956208 18446744073709551615 135172670 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 2508 1778 91 283 0 2222 0
Current children cumulated CPU time (s) 0.06
Current children cumulated vsize (KiB) 10032

[startup+0.10188 s]
/proc/loadavg: 0.00 0.00 0.00 3/64 8600
/proc/meminfo: memFree=1985288/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=10956 CPUtime=0.09
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 2027 0 0 0 8 1 0 0 18 0 1 0 303946306 11218944 2011 1992294400 134512640 135674940 4294956208 18446744073709551615 135113206 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 2739 2011 91 283 0 2453 0
Current children cumulated CPU time (s) 0.09
Current children cumulated vsize (KiB) 10956

[startup+0.301823 s]
/proc/loadavg: 0.00 0.00 0.00 3/64 8600
/proc/meminfo: memFree=1985288/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=17972 CPUtime=0.29
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 3852 0 0 0 27 2 0 0 19 0 1 0 303946306 18403328 3836 1992294400 134512640 135674940 4294956208 18446744073709551615 135113206 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 4493 3836 91 283 0 4207 0
Current children cumulated CPU time (s) 0.29
Current children cumulated vsize (KiB) 17972

[startup+0.701708 s]
/proc/loadavg: 0.00 0.00 0.00 3/64 8600
/proc/meminfo: memFree=1985288/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=20548 CPUtime=0.69
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 4537 0 0 0 67 2 0 0 22 0 1 0 303946306 21041152 4427 1992294400 134512640 135674940 4294956208 18446744073709551615 134564250 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 5137 4427 98 283 0 4851 0
Current children cumulated CPU time (s) 0.69
Current children cumulated vsize (KiB) 20548

[startup+1.50148 s]
/proc/loadavg: 0.00 0.00 0.00 2/65 8601
/proc/meminfo: memFree=1967744/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=20680 CPUtime=1.49
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 4587 0 0 0 147 2 0 0 25 0 1 0 303946306 21176320 4477 1992294400 134512640 135674940 4294956208 18446744073709551615 134556795 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 5170 4477 98 283 0 4884 0
Current children cumulated CPU time (s) 1.49
Current children cumulated vsize (KiB) 20680

[startup+3.10102 s]
/proc/loadavg: 0.00 0.00 0.00 2/65 8601
/proc/meminfo: memFree=1967232/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=21080 CPUtime=3.09
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 4714 0 0 0 306 3 0 0 25 0 1 0 303946306 21585920 4604 1992294400 134512640 135674940 4294956208 18446744073709551615 134556795 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 5270 4604 98 283 0 4984 0
Current children cumulated CPU time (s) 3.09
Current children cumulated vsize (KiB) 21080

[startup+6.30111 s]
/proc/loadavg: 0.08 0.02 0.01 2/65 8601
/proc/meminfo: memFree=1966592/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=21344 CPUtime=6.29
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 4783 0 0 0 626 3 0 0 25 0 1 0 303946306 21856256 4673 1992294400 134512640 135674940 4294956208 18446744073709551615 134564154 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 5336 4673 98 283 0 5050 0
Current children cumulated CPU time (s) 6.29
Current children cumulated vsize (KiB) 21344

[startup+12.7013 s]
/proc/loadavg: 0.15 0.03 0.01 2/65 8601
/proc/meminfo: memFree=1965696/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=22516 CPUtime=12.69
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 5062 0 0 0 1265 4 0 0 25 0 1 0 303946306 23056384 4952 1992294400 134512640 135674940 4294956208 18446744073709551615 134564250 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 5629 4952 98 283 0 5343 0
Current children cumulated CPU time (s) 12.69
Current children cumulated vsize (KiB) 22516

[startup+25.5016 s]
/proc/loadavg: 0.34 0.08 0.02 2/65 8601
/proc/meminfo: memFree=1964096/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=23968 CPUtime=25.49
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 5433 0 0 0 2545 4 0 0 25 0 1 0 303946306 24543232 5323 1992294400 134512640 135674940 4294956208 18446744073709551615 134564017 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 5992 5323 98 283 0 5706 0
Current children cumulated CPU time (s) 25.49
Current children cumulated vsize (KiB) 23968

[startup+51.1013 s]
/proc/loadavg: 0.56 0.15 0.05 2/65 8601
/proc/meminfo: memFree=1960768/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=27668 CPUtime=51.08
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 6293 0 0 0 5103 5 0 0 25 0 1 0 303946306 28332032 6183 1992294400 134512640 135674940 4294956208 18446744073709551615 134565420 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 6917 6183 98 283 0 6631 0
Current children cumulated CPU time (s) 51.08
Current children cumulated vsize (KiB) 27668

[startup+102.306 s]
/proc/loadavg: 0.81 0.28 0.10 2/65 8601
/proc/meminfo: memFree=1953792/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=34884 CPUtime=102.3
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 8152 0 0 0 10223 7 0 0 25 0 1 0 303946306 35721216 7913 1992294400 134512640 135674940 4294956208 18446744073709551615 134564660 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 8721 7913 98 283 0 8435 0
Current children cumulated CPU time (s) 102.3
Current children cumulated vsize (KiB) 34884

[startup+162.302 s]
/proc/loadavg: 0.93 0.41 0.15 2/65 8601
/proc/meminfo: memFree=1953152/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=35624 CPUtime=162.3
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 8297 0 0 0 16223 7 0 0 25 0 1 0 303946306 36478976 8058 1992294400 134512640 135674940 4294956208 18446744073709551615 134564660 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 8906 8058 99 283 0 8620 0
Current children cumulated CPU time (s) 162.3
Current children cumulated vsize (KiB) 35624

Solver just ended. Dumping a history of the last processes samples

[startup+179.102 s]
/proc/loadavg: 0.94 0.44 0.16 2/65 8601
/proc/meminfo: memFree=1952384/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=36608 CPUtime=179.09
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 8540 0 0 0 17902 7 0 0 25 0 1 0 303946306 37486592 8301 1992294400 134512640 135674940 4294956208 18446744073709551615 134565166 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 9152 8301 99 283 0 8866 0
Current children cumulated CPU time (s) 179.09
Current children cumulated vsize (KiB) 36608

[startup+191.901 s]
/proc/loadavg: 0.95 0.46 0.18 2/65 8601
/proc/meminfo: memFree=1950208/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=39064 CPUtime=191.9
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 9062 0 0 0 19182 8 0 0 25 0 1 0 303946306 40001536 8823 1992294400 134512640 135674940 4294956208 18446744073709551615 134564271 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 9766 8823 99 283 0 9480 0
Current children cumulated CPU time (s) 191.9
Current children cumulated vsize (KiB) 39064

[startup+204.701 s]
/proc/loadavg: 0.96 0.49 0.19 2/65 8601
/proc/meminfo: memFree=1948224/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=40944 CPUtime=204.7
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 9526 0 0 0 20462 8 0 0 25 0 1 0 303946306 41926656 9287 1992294400 134512640 135674940 4294956208 18446744073709551615 134564611 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 10236 9287 99 283 0 9950 0
Current children cumulated CPU time (s) 204.7
Current children cumulated vsize (KiB) 40944

[startup+207.906 s]
/proc/loadavg: 0.96 0.49 0.19 2/65 8601
/proc/meminfo: memFree=1947840/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=41232 CPUtime=207.9
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 9609 0 0 0 20782 8 0 0 25 0 1 0 303946306 42221568 9370 1992294400 134512640 135674940 4294956208 18446744073709551615 134556795 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 10308 9370 99 283 0 10022 0
Current children cumulated CPU time (s) 207.9
Current children cumulated vsize (KiB) 41232

[startup+209.501 s]
/proc/loadavg: 0.96 0.49 0.19 2/65 8601
/proc/meminfo: memFree=1947776/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=41364 CPUtime=209.51
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 9628 0 0 0 20942 9 0 0 25 0 1 0 303946306 42356736 9389 1992294400 134512640 135674940 4294956208 18446744073709551615 134537627 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 10341 9389 99 283 0 10055 0
Current children cumulated CPU time (s) 209.51
Current children cumulated vsize (KiB) 41364

[startup+210.302 s]
/proc/loadavg: 0.97 0.50 0.19 2/65 8601
/proc/meminfo: memFree=1947776/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=41364 CPUtime=210.31
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 9628 0 0 0 21022 9 0 0 25 0 1 0 303946306 42356736 9389 1992294400 134512640 135674940 4294956208 18446744073709551615 134564241 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 10341 9389 99 283 0 10055 0
Current children cumulated CPU time (s) 210.31
Current children cumulated vsize (KiB) 41364

[startup+211.102 s]
/proc/loadavg: 0.97 0.50 0.19 3/65 8601
/proc/meminfo: memFree=1947776/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=41364 CPUtime=211.11
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 9628 0 0 0 21102 9 0 0 25 0 1 0 303946306 42356736 9389 1992294400 134512640 135674940 4294956208 18446744073709551615 134564017 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 10341 9389 99 283 0 10055 0
Current children cumulated CPU time (s) 211.11
Current children cumulated vsize (KiB) 41364

[startup+211.502 s]
/proc/loadavg: 0.97 0.50 0.19 3/65 8601
/proc/meminfo: memFree=1947776/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=41364 CPUtime=211.51
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 9628 0 0 0 21142 9 0 0 25 0 1 0 303946306 42356736 9389 1992294400 134512640 135674940 4294956208 18446744073709551615 134564017 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 10341 9389 99 283 0 10055 0
Current children cumulated CPU time (s) 211.51
Current children cumulated vsize (KiB) 41364

[startup+211.601 s]
/proc/loadavg: 0.97 0.50 0.19 3/65 8601
/proc/meminfo: memFree=1947776/2055920 swapFree=4180236/4192956
[pid=8600] ppid=8598 vsize=41364 CPUtime=211.61
/proc/8600/stat : 8600 (SApperloT-base) R 8598 8600 8563 0 -1 4194304 9628 0 0 0 21152 9 0 0 25 0 1 0 303946306 42356736 9389 1992294400 134512640 135674940 4294956208 18446744073709551615 134564406 0 0 4096 0 0 0 0 17 1 0 0
/proc/8600/statm: 10341 9389 99 283 0 10055 0
Current children cumulated CPU time (s) 211.61
Current children cumulated vsize (KiB) 41364

Child status: 0
Real time (s): 211.672
CPU time (s): 211.684
CPU user time (s): 211.586
CPU system time (s): 0.097985
CPU usage (%): 100.006
Max. virtual memory (cumulated for all children) (KiB): 41364

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 211.586
system time used= 0.097985
maximum resident set size= 0
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 9632
page faults= 0
swaps= 0
block input operations= 0
block output operations= 0
messages sent= 0
messages received= 0
signals received= 0
voluntary context switches= 2
involuntary context switches= 378

runsolver used 0.153976 second user time and 0.451931 second system time

The end

Launcher Data

Begin job on node16 at 2009-05-19 20:52:09
IDJOB=1831490
IDBENCH=20420
IDSOLVER=642
FILE ID=node16/1831490-1242759128
PBS_JOBID= 9322282
Free space on /tmp= 66444 MiB

SOLVER NAME= SApperloT base
BENCH NAME= SAT07/industrial/palacios/uts/uts-l05-ipc5-h27-unknown.cnf
COMMAND LINE= HOME/SApperloT-base -seed=RANDOMSEED BENCHNAME
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-1831490-1242759128/watcher-1831490-1242759128 -o /tmp/evaluation-result-1831490-1242759128/solver-1831490-1242759128 -C 10000 -W 12000 -M 1800 --output-limit 1,128  HOME/SApperloT-base -seed=772938234 HOME/instance-1831490-1242759128.cnf

TIME LIMIT= 10000 seconds
MEMORY LIMIT= 1800 MiB
MAX NB THREAD= 0

MD5SUM BENCH= 7634252332633927f116161c1beb6151
RANDOM SEED=772938234

node16.alineos.net Linux 2.6.9-22.EL.rootsmp #1 SMP Mon Oct 3 08:59:52 CEST 2005

/proc/cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	:                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping	: 3
cpu MHz		: 3000.234
cache size	: 2048 KB
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl cid cx16 xtpr
bogomips	: 5914.62
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	:                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping	: 3
cpu MHz		: 3000.234
cache size	: 2048 KB
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl cid cx16 xtpr
bogomips	: 5586.94
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:


/proc/meminfo:
MemTotal:      2055920 kB
MemFree:       1985896 kB
Buffers:          5920 kB
Cached:          30000 kB
SwapCached:       6852 kB
Active:          18540 kB
Inactive:        25492 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      2055920 kB
LowFree:       1985896 kB
SwapTotal:     4192956 kB
SwapFree:      4180236 kB
Dirty:            9276 kB
Writeback:           0 kB
Mapped:          13332 kB
Slab:            11944 kB
Committed_AS:  1066428 kB
PageTables:       1440 kB
VmallocTotal: 536870911 kB
VmallocUsed:    264952 kB
VmallocChunk: 536605679 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

Free space on /tmp at the end= 66440 MiB
End job on node16 at 2009-05-19 20:55:41