Trace number 4120348

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
NaPS 1.02UNSAT 1.55576 1.55683

General information on the benchmark

NamePB15eval/normalized-PB15eval/DEC-SMALLINT-LIN/ProofComplexity-Extracted-Cardinality-Constraints/
ProofComplexity/normalized-tseitin-regular-n70-d3-i2-r2.cnf.gz-plain.pb.metafix.opb
MD5SUMebe7f106f1297a41bb65ad80a7c2239a
Bench CategoryDEC-SMALLINT-LIN (no optimisation, small integers, linear constraints)
Best result obtained on this benchmarkUNSAT
Best value of the objective obtained on this benchmark
Best CPU time to get the best result obtained on this benchmark1.05984
Has Objective FunctionNO
Satisfiable
(Un)Satisfiability was proved
Best value of the objective function
Optimality of the best value was proved
Number of variables105
Total number of constraints280
Number of constraints which are clauses280
Number of constraints which are cardinality constraints (but not clauses)0
Number of constraints which are nor clauses,nor cardinality constraints0
Minimum length of a constraint3
Maximum length of a constraint3
Number of terms in the objective function 0
Biggest coefficient in the objective function 0
Number of bits for the biggest coefficient in the objective function 0
Sum of the numbers in the objective function 0
Number of bits of the sum of numbers in the objective function 0
Biggest number in a constraint 2
Number of bits of the biggest number in a constraint 2
Biggest sum of numbers in a constraint 5
Number of bits of the biggest sum of numbers3
Number of products (including duplicates)0
Sum of products size (including duplicates)0
Number of different products0
Sum of products size0

Solver Data 

0.00/0.00	c NaPS 1.02b.
1.49/1.55	s UNSATISFIABLE
1.49/1.55	c _____________________________________________________________________________
1.49/1.55	c 
1.49/1.55	c std/band forms        : 0,0
1.49/1.55	c 2cl/3cl ITE-codings   : 0,0
1.49/1.55	c BDD/srt/adr Max costs : 0,0,0
1.49/1.55	c BDDraw/bin/mul/srt/adr: 0,0,0,0,0
1.49/1.55	c BDD nodes             : 0
1.49/1.55	c Es1/CC detections     : 0,0
1.49/1.55	c SAT/UNSAT calls       : 0,1
1.49/1.55	c restarts              : 1
1.49/1.55	c conflicts             : 126623         (81599 /sec)
1.49/1.55	c decisions             : 153652         (99018 /sec)
1.49/1.55	c propagations          : 728413         (469410 /sec)
1.49/1.55	c inspects              : 0              (0 /sec)
1.49/1.55	c CPU time (solving tm) : 1.552 s        (1.548 s)
1.49/1.55	c Time for Opt-base     : 0 s
1.49/1.55	c _____________________________________________________________________________

Verifier Data 

ERROR: no interpretation found !

Watcher Data 

runsolver Copyright (C) 2010-2013 Olivier ROUSSEL

This is runsolver version 3.3.7 (svn: 2553)

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-4120348-1467309431/watcher-4120348-1467309431 -o /tmp/evaluation-result-4120348-1467309431/solver-4120348-1467309431 -C 1800 -W 1900 -M 15500 --bin-var /tmp/runsolver-exch-node114-1467308733-20709 --watchdog 1960 -S 80 naps-1.02 HOME/instance-4120348-1467309431.opb 

pid=21484
running on 4 cores: 1,3,5,7

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 1800 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 1830 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 1900 seconds
Enforcing Stack size limit: 81920 KiB
Enforcing VSIZE limit (soft limit, will send SIGTERM then SIGKILL): 15872000 KiB
Enforcing VSIZE limit (hard limit, stack expansion will fail with SIGSEGV, brk() and mmap() will return ENOMEM): 15923200 KiB
Current StackSize limit: 81920 KiB


[startup+0 s]
/proc/loadavg: 2.08 2.11 1.93 3/176 21487
/proc/meminfo: memFree=29710272/32872528 swapFree=13208/1155804
[pid=21487] ppid=21484 vsize=2060 CPUtime=0 cores=1,3,5,7
/proc/21487/stat : 21487 (naps-1.02) R 21484 21487 20692 0 -1 4202496 332 0 0 0 0 0 0 0 20 0 1 0 11910488 2109440 199 33554432000 4194304 5796924 140733920498512 140735874801576 4606640 0 0 4096 17954 0 0 0 17 5 0 0 0 0 0
/proc/21487/statm: 515 199 146 392 0 114 0

[startup+0.100111 s]
/proc/loadavg: 2.08 2.11 1.93 3/176 21487
/proc/meminfo: memFree=29710272/32872528 swapFree=13208/1155804
[pid=21487] ppid=21484 vsize=4196 CPUtime=0.09 cores=1,3,5,7
/proc/21487/stat : 21487 (naps-1.02) R 21484 21487 20692 0 -1 4202496 804 0 0 0 9 0 0 0 20 0 1 0 11910488 4296704 661 33554432000 4194304 5796924 140733920498512 140735874801576 4611125 0 0 4096 17954 0 0 0 17 5 0 0 0 0 0
/proc/21487/statm: 1049 661 147 392 0 648 0
Current children cumulated CPU time (s) 0.09
Current children cumulated vsize (KiB) 4196

[startup+0.200238 s]
/proc/loadavg: 2.08 2.11 1.93 3/176 21487
/proc/meminfo: memFree=29710272/32872528 swapFree=13208/1155804
[pid=21487] ppid=21484 vsize=5668 CPUtime=0.19 cores=1,3,5,7
/proc/21487/stat : 21487 (naps-1.02) R 21484 21487 20692 0 -1 4202496 1077 0 0 0 19 0 0 0 20 0 1 0 11910488 5804032 923 33554432000 4194304 5796924 140733920498512 140735874801576 4611179 0 0 4096 17954 0 0 0 17 5 0 0 0 0 0
/proc/21487/statm: 1417 923 147 392 0 1016 0
Current children cumulated CPU time (s) 0.19
Current children cumulated vsize (KiB) 5668

[startup+0.300212 s]
/proc/loadavg: 2.08 2.11 1.93 3/176 21487
/proc/meminfo: memFree=29710272/32872528 swapFree=13208/1155804
[pid=21487] ppid=21484 vsize=5668 CPUtime=0.29 cores=1,3,5,7
/proc/21487/stat : 21487 (naps-1.02) R 21484 21487 20692 0 -1 4202496 1220 0 0 0 29 0 0 0 20 0 1 0 11910488 5804032 1057 33554432000 4194304 5796924 140733920498512 140735874801576 4611125 0 0 4096 17954 0 0 0 17 5 0 0 0 0 0
/proc/21487/statm: 1417 1057 147 392 0 1016 0
Current children cumulated CPU time (s) 0.29
Current children cumulated vsize (KiB) 5668

[startup+0.700201 s]
/proc/loadavg: 2.08 2.11 1.93 3/176 21487
/proc/meminfo: memFree=29710272/32872528 swapFree=13208/1155804
[pid=21487] ppid=21484 vsize=8440 CPUtime=0.69 cores=1,3,5,7
/proc/21487/stat : 21487 (naps-1.02) R 21484 21487 20692 0 -1 4202496 1768 0 0 0 69 0 0 0 20 0 1 0 11910488 8642560 1575 33554432000 4194304 5796924 140733920498512 140735874801576 4607255 0 0 4096 17954 0 0 0 17 5 0 0 0 0 0
/proc/21487/statm: 2110 1575 147 392 0 1709 0
Current children cumulated CPU time (s) 0.69
Current children cumulated vsize (KiB) 8440

[startup+1.50021 s]
/proc/loadavg: 2.08 2.11 1.93 3/177 21488
/proc/meminfo: memFree=29702180/32872528 swapFree=13208/1155804
[pid=21487] ppid=21484 vsize=11764 CPUtime=1.49 cores=1,3,5,7
/proc/21487/stat : 21487 (naps-1.02) R 21484 21487 20692 0 -1 4202496 2867 0 0 0 149 0 0 0 20 0 1 0 11910488 12046336 2591 33554432000 4194304 5796924 140733920498512 140733920495752 4596058 0 0 4096 17954 0 0 0 17 5 0 0 0 0 0
/proc/21487/statm: 2941 2591 147 392 0 2540 0
Current children cumulated CPU time (s) 1.49
Current children cumulated vsize (KiB) 11764

Solver just ended.
??? exit watcher main loop
??? sigkill at end of watcher main loop
??? kill 21487 sig 9
??? end of watcher thread
Dumping a history of the last processes samples

[startup+1.50021 s]
/proc/loadavg: 2.08 2.11 1.93 3/177 21488
/proc/meminfo: memFree=29702180/32872528 swapFree=13208/1155804
[pid=21487] ppid=21484 vsize=11764 CPUtime=1.49 cores=1,3,5,7
/proc/21487/stat : 21487 (naps-1.02) R 21484 21487 20692 0 -1 4202496 2867 0 0 0 149 0 0 0 20 0 1 0 11910488 12046336 2591 33554432000 4194304 5796924 140733920498512 140733920495752 4596058 0 0 4096 17954 0 0 0 17 5 0 0 0 0 0
/proc/21487/statm: 2941 2591 147 392 0 2540 0
Current children cumulated CPU time (s) 1.49
Current children cumulated vsize (KiB) 11764

Child status: 20
Real time (s): 1.55683
CPU time (s): 1.55576
CPU user time (s): 1.55176
CPU system time (s): 0.003999
CPU usage (%): 99.9312
Max. virtual memory (cumulated for all children) (KiB): 11764

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 1.55176
system time used= 0.003999
maximum resident set size= 10424
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 2882
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= 3
involuntary context switches= 2

??? join timestamper begins
??? join timestamper ends
??? end of timestamper thread
runsolver used 0.002999 second user time and 0.012998 second system time

The end

Launcher Data 

Begin job on node114 at 2016-06-30 19:57:11
IDJOB=4120348
IDBENCH=109892
IDSOLVER=2544
FILE ID=node114/4120348-1467309431
RUNJOBID= node114-1467308733-20709
PBS_JOBID= 20005267
Free space on /tmp= 71668 MiB

SOLVER NAME= NaPS 1.02
BENCH NAME= PB15eval/normalized-PB15eval/DEC-SMALLINT-LIN/ProofComplexity-Extracted-Cardinality-Constraints/ProofComplexity/normalized-tseitin-regular-n70-d3-i2-r2.cnf.gz-plain.pb.metafix.opb
COMMAND LINE= naps-1.02 BENCHNAME
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-4120348-1467309431/watcher-4120348-1467309431 -o /tmp/evaluation-result-4120348-1467309431/solver-4120348-1467309431 -C 1800 -W 1900 -M 15500 --bin-var /tmp/runsolver-exch-node114-1467308733-20709 --watchdog 1960 -S 80 naps-1.02 HOME/instance-4120348-1467309431.opb

TIME LIMIT= 1800 seconds
MEMORY LIMIT= 15500 MiB
NBCORE= 4

MD5SUM BENCH= ebe7f106f1297a41bb65ad80a7c2239a
RANDOM SEED=435461053

node114.alineos.net Linux 2.6.32-71.29.1.el6.x86_64 #1 SMP Mon Jun 27 19:49:27 BST 2011

/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		: 2666.752
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 4
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5333.50
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.752
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 0
cpu cores	: 4
apicid		: 16
initial apicid	: 16
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.55
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

processor	: 2
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.752
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 1
cpu cores	: 4
apicid		: 2
initial apicid	: 2
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.55
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

processor	: 3
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.752
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 1
cpu cores	: 4
apicid		: 18
initial apicid	: 18
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.55
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

processor	: 4
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.752
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 2
cpu cores	: 4
apicid		: 4
initial apicid	: 4
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.55
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

processor	: 5
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.752
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 2
cpu cores	: 4
apicid		: 20
initial apicid	: 20
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.56
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

processor	: 6
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.752
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 3
cpu cores	: 4
apicid		: 6
initial apicid	: 6
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.56
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

processor	: 7
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.752
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 3
cpu cores	: 4
apicid		: 22
initial apicid	: 22
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.55
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:


/proc/meminfo:
MemTotal:       32872528 kB
MemFree:        29710536 kB
Buffers:          133976 kB
Cached:          1046212 kB
SwapCached:            0 kB
Active:           349412 kB
Inactive:         916240 kB
Active(anon):      82404 kB
Inactive(anon):     6048 kB
Active(file):     267008 kB
Inactive(file):   910192 kB
Unevictable:     1155804 kB
Mlocked:           13208 kB
SwapTotal:      67108856 kB
SwapFree:       67108856 kB
Dirty:              3924 kB
Writeback:             8 kB
AnonPages:       1241052 kB
Mapped:            14616 kB
Shmem:               204 kB
Slab:             609828 kB
SReclaimable:      54096 kB
SUnreclaim:       555732 kB
KernelStack:        1432 kB
PageTables:         6456 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    83545120 kB
Committed_AS:    1372860 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      346412 kB
VmallocChunk:   34341988032 kB
HardwareCorrupted:     0 kB
AnonHugePages:   1202176 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:        7552 kB
DirectMap2M:    33538048 kB

Free space on /tmp at the end= 71664 MiB
End job on node114 at 2016-06-30 19:57:12