Trace number 4254045

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 NameAnswerobjective functionCPU timeWall clock time
choco-solver 4.0.5 seq (2017-07-26)OPT4 0.94964999 0.628555

General information on the benchmark

NameGraphColoring/GraphColoring-m1-fixed/
GraphColoring-qwhopt-o5-h10-1.xml
MD5SUM4716a87298188d70bc9d7e045ef51dee
Bench CategoryCOP (optimization problem)
Best result obtained on this benchmarkOPT
Best value of the objective obtained on this benchmark4
Best CPU time to get the best result obtained on this benchmark0.073991999
Satisfiable
(Un)Satisfiability was proved
Number of variables25
Number of constraints101
Number of domains1
Minimum domain size25
Maximum domain size25
Distribution of domain sizes[{"size":25,"count":25}]
Minimum variable degree9
Maximum variable degree10
Distribution of variable degrees[{"degree":9,"count":10},{"degree":10,"count":15}]
Minimum constraint arity2
Maximum constraint arity15
Distribution of constraint arities[{"arity":2,"count":100},{"arity":15,"count":1}]
Number of extensional constraints0
Number of intensional constraints100
Distribution of constraint types[{"type":"intension","count":100},{"type":"instantiation","count":1}]
Optimization problemYES
Type of objectivemin MAXIMUM

Solver Data 

0.00/0.10	c java -server -Xmx11000m -cp .:.//choco-parsers.jar org.chocosolver.parser.xcsp.ChocoXCSP "HOME/instance-4254045-1501612757.xml"  -tl '264s' -p 1 -x 0
0.00/0.28	c [HOME/instance-4254045-1501612757.xml, -tl, 264s, -p, 1, -x, 0]
0.00/0.34	c simple solver
0.00/0.41	c parse instance...
0.00/0.60	c solve instance...
0.00/0.62	o 4 
0.00/0.62	s OPTIMUM FOUND
0.00/0.62	v <instantiation>
0.00/0.62	v 	<list>x[0] x[1] x[2] x[3] x[4] x[5] x[6] x[7] x[8] x[9] x[10] x[11] x[12] x[13] x[14] x[15] x[16] x[17] x[18] x[19] x[20] x[21] x[22] x[23] x[24] </list>
0.00/0.62	v 	<values>0 1 4 3 2 3 4 1 2 0 1 0 2 4 3 2 3 0 1 4 4 2 3 0 1 </values>
0.00/0.62	v </instantiation>

Verifier Data 

OK	4

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-4254045-1501612757/watcher-4254045-1501612757 -o /tmp/evaluation-result-4254045-1501612757/solver-4254045-1501612757 -C 264 -W 240 -M 15500 --bin-var /tmp/runsolver-exch-node129-1501611185-5151 --watchdog 300 ./xcsp3-exec -dir HOME -tl 264 -ml 11000 -tdir HOME -seed 214943669 HOME/instance-4254045-1501612757.xml 

pid=6015
running on 4 cores: 0,2,4,6

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 264 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 294 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 240 seconds
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: 8192 KiB


[startup+0 s]
/proc/loadavg: 2.10 1.82 1.10 5/195 6018
/proc/meminfo: memFree=31951152/32770624 swapFree=0/181824
[pid=6018] ppid=6015 vsize=23672 CPUtime=0 cores=0,2,4,6
/proc/6018/stat : 6018 (runsolver) D 6015 6018 5091 0 -1 4202560 107 0 0 0 0 0 0 0 20 0 1 0 9898843 24240128 108 18446744073709551615 4194304 4338465 140721151238064 140721151235704 139853863514839 0 0 1 24578 18446744071580418449 0 0 17 2 0 0 0 0 0 6438912 6441760 28753920 140721151246430 140721151246918 140721151246918 140721151250378 0
/proc/6018/statm: 5918 108 54 36 0 2156 0

[startup+0.10015 s]
/proc/loadavg: 2.10 1.82 1.10 5/195 6018
/proc/meminfo: memFree=31951152/32770624 swapFree=0/181824
[pid=6018] ppid=6015 vsize=9512 CPUtime=0 cores=0,2,4,6
/proc/6018/stat : 6018 (xcsp3-exec) S 6015 6018 5091 0 -1 4202496 509 0 0 0 0 0 0 0 20 0 1 0 9898843 9740288 345 18446744073709551615 4194304 5098028 140728775299888 140728775297992 140250606576252 0 65536 5 65538 18446744071579417331 0 0 17 4 0 0 9 0 0 7196144 7232144 29741056 140728775303580 140728775303783 140728775303783 140728775307243 0
/proc/6018/statm: 2378 345 289 221 0 87 0
Current children cumulated CPU time (s) 0
Current children cumulated vsize (KiB) 9512

[startup+0.2024 s]
/proc/loadavg: 2.10 1.82 1.10 5/195 6018
/proc/meminfo: memFree=31951152/32770624 swapFree=0/181824
[pid=6018] ppid=6015 vsize=9512 CPUtime=0 cores=0,2,4,6
/proc/6018/stat : 6018 (xcsp3-exec) S 6015 6018 5091 0 -1 4202496 509 0 0 0 0 0 0 0 20 0 1 0 9898843 9740288 345 18446744073709551615 4194304 5098028 140728775299888 140728775297992 140250606576252 0 65536 5 65538 18446744071579417331 0 0 17 4 0 0 9 0 0 7196144 7232144 29741056 140728775303580 140728775303783 140728775303783 140728775307243 0
/proc/6018/statm: 2378 345 289 221 0 87 0
Current children cumulated CPU time (s) 0
Current children cumulated vsize (KiB) 9512

[startup+0.30023 s]
/proc/loadavg: 2.10 1.82 1.10 5/195 6018
/proc/meminfo: memFree=31951152/32770624 swapFree=0/181824
[pid=6018] ppid=6015 vsize=9512 CPUtime=0 cores=0,2,4,6
/proc/6018/stat : 6018 (xcsp3-exec) S 6015 6018 5091 0 -1 4202496 509 0 0 0 0 0 0 0 20 0 1 0 9898843 9740288 345 18446744073709551615 4194304 5098028 140728775299888 140728775297992 140250606576252 0 65536 5 65538 18446744071579417331 0 0 17 4 0 0 9 0 0 7196144 7232144 29741056 140728775303580 140728775303783 140728775303783 140728775307243 0
/proc/6018/statm: 2378 345 289 221 0 87 0
Current children cumulated CPU time (s) 0
Current children cumulated vsize (KiB) 9512

Solver just ended.
??? exit watcher main loop
??? sigkill at end of watcher main loop
??? kill 6018 sig 9
??? end of watcher thread
Dumping a history of the last processes samples

[startup+0.400314 s]
/proc/loadavg: 2.10 1.82 1.10 5/195 6018
/proc/meminfo: memFree=31951152/32770624 swapFree=0/181824
[pid=6018] ppid=6015 vsize=9512 CPUtime=0 cores=0,2,4,6
/proc/6018/stat : 6018 (xcsp3-exec) S 6015 6018 5091 0 -1 4202496 509 0 0 0 0 0 0 0 20 0 1 0 9898843 9740288 345 18446744073709551615 4194304 5098028 140728775299888 140728775297992 140250606576252 0 65536 5 65538 18446744071579417331 0 0 17 4 0 0 9 0 0 7196144 7232144 29741056 140728775303580 140728775303783 140728775303783 140728775307243 0
/proc/6018/statm: 2378 345 289 221 0 87 0
Current children cumulated CPU time (s) 0
Current children cumulated vsize (KiB) 9512

[startup+0.600718 s]
/proc/loadavg: 2.10 1.82 1.10 5/195 6018
/proc/meminfo: memFree=31951152/32770624 swapFree=0/181824
[pid=6018] ppid=6015 vsize=9512 CPUtime=0 cores=0,2,4,6
/proc/6018/stat : 6018 (xcsp3-exec) S 6015 6018 5091 0 -1 4202496 509 0 0 0 0 0 0 0 20 0 1 0 9898843 9740288 345 18446744073709551615 4194304 5098028 140728775299888 140728775297992 140250606576252 0 65536 5 65538 18446744071579417331 0 0 17 4 0 0 9 0 0 7196144 7232144 29741056 140728775303580 140728775303783 140728775303783 140728775307243 0
/proc/6018/statm: 2378 345 289 221 0 87 0
Current children cumulated CPU time (s) 0
Current children cumulated vsize (KiB) 9512

Child status: 0
Real time (s): 0.628555
CPU time (s): 0.94965
CPU user time (s): 0.885658
CPU system time (s): 0.063992
CPU usage (%): 151.085
Max. virtual memory (cumulated for all children) (KiB): 9512

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 0.885658
system time used= 0.063992
maximum resident set size= 61496
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 13384
page faults= 0
swaps= 0
block input operations= 0
block output operations= 8
messages sent= 0
messages received= 0
signals received= 0
voluntary context switches= 1307
involuntary context switches= 5

??? join timestamper begins
??? join timestamper ends
??? end of timestamper thread
runsolver used 0.00586 second user time and 0.004688 second system time

The end

Launcher Data 

Begin job on node129 at 2017-08-01 20:25:18
IDJOB=4254045
IDBENCH=120534
IDSOLVER=2635
FILE ID=node129/4254045-1501612757
RUNJOBID= node129-1501611185-5151
PBS_JOBID= 
Free space on /tmp= 61764 MiB

SOLVER NAME= choco-solver 4.0.5 seq
BENCH NAME= XCSP17/GraphColoring/GraphColoring-m1-fixed/GraphColoring-qwhopt-o5-h10-1.xml
COMMAND LINE= ./xcsp3-exec -dir DIR -tl TIMEOUT -ml 11000 -tdir TMPDIR -seed RANDOMSEED BENCHNAME
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-4254045-1501612757/watcher-4254045-1501612757 -o /tmp/evaluation-result-4254045-1501612757/solver-4254045-1501612757 -C 264 -W 240 -M 15500 --bin-var /tmp/runsolver-exch-node129-1501611185-5151 --watchdog 300  ./xcsp3-exec -dir HOME -tl 264 -ml 11000 -tdir HOME -seed 214943669 HOME/instance-4254045-1501612757.xml

TIME LIMIT= 264 seconds
MEMORY LIMIT= 15500 MiB
NBCORE= 4

MD5SUM BENCH= 4716a87298188d70bc9d7e045ef51dee
RANDOM SEED=214943669

node129.alineos.net Linux 3.10.0-514.16.1.el7.x86_64 #1 SMP Wed Apr 12 15:04:24 UTC 2017

/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:
performance

/proc/cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
microcode	: 0x19
cpu MHz		: 2668.000
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 sep 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 nopl 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 dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5333.53
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
microcode	: 0x19
cpu MHz		: 2668.000
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 sep 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 nopl 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 dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.57
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
microcode	: 0x19
cpu MHz		: 2668.000
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 sep 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 nopl 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 dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5333.53
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
microcode	: 0x19
cpu MHz		: 2668.000
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 sep 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 nopl 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 dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.57
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
microcode	: 0x19
cpu MHz		: 2668.000
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 sep 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 nopl 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 dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5333.53
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
microcode	: 0x19
cpu MHz		: 2668.000
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 sep 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 nopl 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 dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.57
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
microcode	: 0x19
cpu MHz		: 2668.000
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 sep 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 nopl 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 dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5333.53
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
microcode	: 0x19
cpu MHz		: 2668.000
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 sep 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 nopl 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 dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips	: 5332.57
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:


/proc/meminfo:
MemTotal:       32770624 kB
MemFree:        31955112 kB
MemAvailable:   32006560 kB
Buffers:           89032 kB
Cached:           247584 kB
SwapCached:            0 kB
Active:           232780 kB
Inactive:         190356 kB
Active(anon):      86624 kB
Inactive(anon):     8532 kB
Active(file):     146156 kB
Inactive(file):   181824 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:      67108860 kB
SwapFree:       67108860 kB
Dirty:             20032 kB
Writeback:             0 kB
AnonPages:         70168 kB
Mapped:            41204 kB
Shmem:              8872 kB
Slab:             102540 kB
SReclaimable:      78608 kB
SUnreclaim:        23932 kB
KernelStack:        3152 kB
PageTables:         4204 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    83494172 kB
Committed_AS:    1234300 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      350232 kB
VmallocChunk:   34341910524 kB
HardwareCorrupted:     0 kB
AnonHugePages:      6144 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      114048 kB
DirectMap2M:    33431552 kB

Free space on /tmp at the end= 61756 MiB
End job on node129 at 2017-08-01 20:25:18