Trace number 3157000

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
shortsattime2011 2011-03-02SAT 4.63529 4.63678

General information on the benchmark

Namerandom/medium/
unif-k5-r21.3-v175-c3727-S520872997-084.SATISFIABLE.cnf
MD5SUMb9af20624ed5bd46fea8950d0fddc198
Bench CategoryRANDOM (random instances)
Best result obtained on this benchmarkSAT
Best CPU time to get the best result obtained on this benchmark0.18797
Satisfiable
(Un)Satisfiability was proved
Number of variables175
Number of clauses3727
Sum of the clauses size18635
Maximum clause length5
Minimum clause length5
Number of clauses of size 10
Number of clauses of size 20
Number of clauses of size 30
Number of clauses of size 40
Number of clauses of size 53727
Number of clauses of size over 50

Solver Data 

4.59/4.63	c 0 clauses are redundant and removed
4.59/4.63	c 0 vars are fixed and 0 clauses are removed after unit propagation
4.59/4.63	c 0 vars are fixed and 0 clauses are removed after lookahead
4.59/4.63	c initial seed is 898042520
4.59/4.63	c try=1 flip j=2402166 walk=1840108 seed 898042537
4.59/4.63	c A solution is found
4.59/4.63	s SATISFIABLE
4.59/4.63	v 1 2 3 4 -5 6 7 8 9 -10 -11 -12 -13 -14 -15 -16 17 18 -19 -20 -21 -22 23 -24 -25 -26 -27 28 29 30 31 32 33 34 -35 -36 37 -38 39 40 41 42 -43 -44 45 46 47 -48 49 -50 -51 -52 -53 -54 55 -56 -57 58 59 -60 -61 62 63 -64 65 -66 67 -68 -69 70 -71 72 73 74 -75 -76 -77 -78 -79 -80 -81 -82 -83 84 -85 86 87 88 89 90 91 92 -93 -94 95 -96 97 98 99 -100 -101 102 -103 104 105 -106 -107 108 -109 -110 -111 112 113 -114 115 -116 117 -118 -119 -120 121 122 123 -124 -125 -126 127 -128 -129 -130 -131 -132 133 -134 135 136 -137 138 -139 -140 -141 -142 143 -144 145 146 147 -148 -149 150 151 152 153 -154 155 -156 157 158 159 160 161 162 163 164 165 -166 167 168 169 -170 -171 172 173 174 175 
4.59/4.63	v 0 
4.59/4.63	c Done (mycputime is 4 seconds)

Verifier Data 

OK

Watcher Data 

runsolver Copyright (C) 2010 Olivier ROUSSEL

This is runsolver version 3.3.0 (svn: 893)

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

command line: BIN/runsolver --timestamp -w /tmp/evaluation-result-3157000-1301680755/watcher-3157000-1301680755 -o /tmp/evaluation-result-3157000-1301680755/solver-3157000-1301680755 -C 2400 -W 1300 -M 7680 shortsattime2011 HOME/instance-3157000-1301680755.cnf 898035733 

running on 2 cores: 0,2

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 2400 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 2430 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 1300 seconds
Enforcing VSIZE limit (soft limit, will send SIGTERM then SIGKILL): 7864320 KiB
Enforcing VSIZE limit (hard limit, stack expansion will fail with SIGSEGV, brk() and mmap() will return ENOMEM): 7915520 KiB
Current StackSize limit: 10240 KiB


[startup+0 s]
/proc/loadavg: 4.03 4.02 3.74 5/189 30918
/proc/meminfo: memFree=21920828/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1185844 CPUtime=0 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 342 0 0 0 0 0 0 0 25 0 1 0 279678099 1214304256 283 33554432000 4194304 4230460 140734677032528 18446744073709551615 4207504 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296461 283 103 9 0 293618 0

[startup+0.048314 s]
/proc/loadavg: 4.03 4.02 3.74 5/189 30918
/proc/meminfo: memFree=21920828/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=0.04 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 4 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4220879 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 0.04
Current children cumulated vsize (KiB) 1186112

[startup+0.100302 s]
/proc/loadavg: 4.03 4.02 3.74 5/189 30918
/proc/meminfo: memFree=21920828/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=0.09 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 9 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4220434 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 0.09
Current children cumulated vsize (KiB) 1186112

[startup+0.300271 s]
/proc/loadavg: 4.03 4.02 3.74 5/189 30918
/proc/meminfo: memFree=21920828/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=0.29 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 29 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4224096 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 0.29
Current children cumulated vsize (KiB) 1186112

[startup+0.700206 s]
/proc/loadavg: 4.03 4.02 3.74 5/189 30918
/proc/meminfo: memFree=21920828/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=0.69 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 69 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4220659 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 0.69
Current children cumulated vsize (KiB) 1186112

[startup+1.50107 s]
/proc/loadavg: 4.02 4.02 3.74 5/190 30919
/proc/meminfo: memFree=21919208/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=1.49 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 149 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4220805 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 1.49
Current children cumulated vsize (KiB) 1186112

[startup+3.10075 s]
/proc/loadavg: 4.02 4.02 3.74 5/190 30919
/proc/meminfo: memFree=21918836/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=3.09 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 309 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4219953 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 3.09
Current children cumulated vsize (KiB) 1186112

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

[startup+3.90061 s]
/proc/loadavg: 4.02 4.02 3.74 5/190 30919
/proc/meminfo: memFree=21918712/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=3.89 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 389 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4220800 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 3.89
Current children cumulated vsize (KiB) 1186112

[startup+4.30056 s]
/proc/loadavg: 4.02 4.02 3.74 5/190 30919
/proc/meminfo: memFree=21918708/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=4.3 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 430 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4220853 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 4.3
Current children cumulated vsize (KiB) 1186112

[startup+4.50052 s]
/proc/loadavg: 4.02 4.02 3.74 5/190 30919
/proc/meminfo: memFree=21918708/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=4.49 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 449 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4220198 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 4.49
Current children cumulated vsize (KiB) 1186112

[startup+4.60051 s]
/proc/loadavg: 4.02 4.02 3.74 5/190 30919
/proc/meminfo: memFree=21918708/32951124 swapFree=67111528/67111528
[pid=30918] ppid=30916 vsize=1186112 CPUtime=4.59 cores=0,2
/proc/30918/stat : 30918 (shortsattime201) R 30916 30918 30433 0 -1 4202496 475 0 0 0 459 0 0 0 25 0 1 0 279678099 1214578688 415 33554432000 4194304 4230460 140734677032528 18446744073709551615 4217571 0 0 4096 0 0 0 0 17 0 0 0 0
/proc/30918/statm: 296528 415 117 9 0 293685 0
Current children cumulated CPU time (s) 4.59
Current children cumulated vsize (KiB) 1186112

Child status: 10
Real time (s): 4.63678
CPU time (s): 4.63529
CPU user time (s): 4.63529
CPU system time (s): 0
CPU usage (%): 99.9679
Max. virtual memory (cumulated for all children) (KiB): 1186112

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 4.6353
system time used= 0
maximum resident set size= 0
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 479
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= 9

runsolver used 0.007998 second user time and 0.017997 second system time

The end

Launcher Data 

Begin job on node103 at 2011-04-01 19:59:15
IDJOB=3157000
IDBENCH=82715
IDSOLVER=1566
FILE ID=node103/3157000-1301680755
RUNJOBID= node103-1301678143-30451
PBS_JOBID= 12840593
Free space on /tmp= 71260 MiB

SOLVER NAME= shortsattime2011 2011-03-02
BENCH NAME= SAT11/random/medium/unif-k5-r21.3-v175-c3727-S520872997-084.SATISFIABLE.cnf
COMMAND LINE= shortsattime2011 BENCHNAME RANDOMSEED
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-3157000-1301680755/watcher-3157000-1301680755 -o /tmp/evaluation-result-3157000-1301680755/solver-3157000-1301680755 -C 2400 -W 1300 -M 7680  shortsattime2011 HOME/instance-3157000-1301680755.cnf 898035733

TIME LIMIT= 2400 seconds
MEMORY LIMIT= 7680 MiB
NBCORE= 2

MD5SUM BENCH= b9af20624ed5bd46fea8950d0fddc198
RANDOM SEED=898035733

node103.alineos.net Linux 2.6.18-164.el5 #1 SMP Thu Sep 3 03:28:30 EDT 2009

/proc/cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.858
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 4
apicid		: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
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 rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5333.71
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.858
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 0
cpu cores	: 4
apicid		: 16
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
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 rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.75
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 2
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.858
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 1
cpu cores	: 4
apicid		: 2
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
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 rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.75
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 3
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.858
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 1
cpu cores	: 4
apicid		: 18
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
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 rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.77
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 4
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.858
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 2
cpu cores	: 4
apicid		: 4
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
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 rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.75
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 5
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.858
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 2
cpu cores	: 4
apicid		: 20
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
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 rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.75
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 6
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.858
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 3
cpu cores	: 4
apicid		: 6
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
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 rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.83
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 7
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.858
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 3
cpu cores	: 4
apicid		: 22
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
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 rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.75
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]


/proc/meminfo:
MemTotal:     32951124 kB
MemFree:      21921232 kB
Buffers:        314636 kB
Cached:       10354356 kB
SwapCached:          0 kB
Active:        7440092 kB
Inactive:      3326348 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:     32951124 kB
LowFree:      21921232 kB
SwapTotal:    67111528 kB
SwapFree:     67111528 kB
Dirty:            8016 kB
Writeback:           0 kB
AnonPages:       97472 kB
Mapped:          15356 kB
Slab:           199744 kB
PageTables:       5752 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:  83587088 kB
Committed_AS:  3819356 kB
VmallocTotal: 34359738367 kB
VmallocUsed:    296008 kB
VmallocChunk: 34359440975 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
Hugepagesize:     2048 kB

Free space on /tmp at the end= 71252 MiB
End job on node103 at 2011-04-01 19:59:20