Trace number 4120725

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
Open-WBO-LSU PB16UNSAT 0.667898 0.667349

General information on the benchmark

NamePB15eval/normalized-PB15eval/DEC-SMALLINT-LIN/ProofComplexity-Extracted-Cardinality-Constraints/
ProofComplexity/normalized-tseitin-regular-n60-d3-i2-r1.cnf.gz-plain.pb.metafix.opb
MD5SUMf28443e989698cab5a2f0964edb3ac4d
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 benchmark0.330949
Has Objective FunctionNO
Satisfiable
(Un)Satisfiability was proved
Best value of the objective function
Optimality of the best value was proved
Number of variables90
Total number of constraints240
Number of constraints which are clauses240
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
0.00/0.00	c Open-WBO:	 a Modular MaxSAT Solver -- based on Glucose4.0 (core version)
0.00/0.00	c Version:	 Pseudo-Boolean Evaluation 2016 -- LSU
0.00/0.00	c Authors:	 Ruben Martins, Vasco Manquinho, Ines Lynce
0.00/0.00	c Contributors:	 Miguel Neves, Saurabh Joshi, Mikolas Janota
0.00/0.00	c Contact:	 open-wbo@sat.inesc-id.pt -- http://sat.inesc-id.pt/open-wbo/
0.00/0.00	c
0.00/0.00	c WARNING: for repeatability, setting FPU to use double precision
0.00/0.00	c Instance file HOME/instance-4120725-1467308952.opb
0.00/0.00	c File size is 6960 bytes.
0.59/0.66	c Sum of soft weights:            0
0.59/0.66	c |                                                                                                       |
0.59/0.66	c ========================================[ Problem Statistics ]===========================================
0.59/0.66	c |                                                                                                       |
0.59/0.66	c |  Problem Type:           Unweighted                                                                   |
0.59/0.66	c |  Number of variables:            90                                                                   |
0.59/0.66	c |  Number of hard clauses:        240                                                                   |
0.59/0.66	c |  Number of soft clauses:          0                                                                   |
0.59/0.66	c |  Number of cardinality:           0                                                                   |
0.59/0.66	c |  Number of PB :                   0                                                                   |
0.59/0.66	c |  Parse time:                   0.00 s                                                                 |
0.59/0.66	c |                                                                                                       |
0.59/0.66	c ==========================================[ Solver Settings ]============================================
0.59/0.66	c |                                                                                                       |
0.59/0.66	c |  Algorithm:                LinearSU                                                                   |
0.59/0.66	c |  Cardinality Encoding:       Modulo Totalizer                                                         |
0.59/0.66	c |                                                                                                       |
0.59/0.66	s UNSATISFIABLE

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-4120725-1467308952/watcher-4120725-1467308952 -o /tmp/evaluation-result-4120725-1467308952/solver-4120725-1467308952 -C 1800 -W 1900 -M 15500 --bin-var /tmp/runsolver-exch-node103-1467308727-15676 --watchdog 1960 open-wbo-lsu HOME/instance-4120725-1467308952.opb 

pid=16762
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 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: 10240 KiB


[startup+0 s]
/proc/loadavg: 1.93 1.86 1.49 3/176 16765
/proc/meminfo: memFree=30245720/32872528 swapFree=242912/249044
[pid=16765] ppid=16762 vsize=6560 CPUtime=0 cores=1,3,5,7
/proc/16765/stat : 16765 (open-wbo-lsu) R 16762 16765 15659 0 -1 4202496 363 0 0 0 0 0 0 0 20 0 1 0 12001565 6717440 235 33554432000 4194304 6058637 140737358284576 140734433997240 4280035 0 0 4096 8404992 0 0 0 17 3 0 0 0 0 0
/proc/16765/statm: 1640 235 168 456 0 1176 0

[startup+0.100191 s]
/proc/loadavg: 1.93 1.86 1.49 3/176 16765
/proc/meminfo: memFree=30245720/32872528 swapFree=242912/249044
[pid=16765] ppid=16762 vsize=3636 CPUtime=0.09 cores=1,3,5,7
/proc/16765/stat : 16765 (open-wbo-lsu) R 16762 16765 15659 0 -1 4202496 694 0 0 0 9 0 0 0 20 0 1 0 12001565 3723264 517 33554432000 4194304 6058637 140737358284576 140737358283304 4277733 0 0 4096 8404992 0 0 0 17 3 0 0 0 0 0
/proc/16765/statm: 909 517 170 456 0 445 0
Current children cumulated CPU time (s) 0.09
Current children cumulated vsize (KiB) 3636

[startup+0.200245 s]
/proc/loadavg: 1.93 1.86 1.49 3/176 16765
/proc/meminfo: memFree=30245720/32872528 swapFree=242912/249044
[pid=16765] ppid=16762 vsize=4652 CPUtime=0.19 cores=1,3,5,7
/proc/16765/stat : 16765 (open-wbo-lsu) R 16762 16765 15659 0 -1 4202496 923 0 0 0 19 0 0 0 20 0 1 0 12001565 4763648 735 33554432000 4194304 6058637 140737358284576 140737358283304 4280035 0 0 4096 8404992 0 0 0 17 3 0 0 0 0 0
/proc/16765/statm: 1163 735 170 456 0 699 0
Current children cumulated CPU time (s) 0.19
Current children cumulated vsize (KiB) 4652

[startup+0.300361 s]
/proc/loadavg: 1.93 1.86 1.49 3/176 16765
/proc/meminfo: memFree=30245720/32872528 swapFree=242912/249044
[pid=16765] ppid=16762 vsize=4652 CPUtime=0.29 cores=1,3,5,7
/proc/16765/stat : 16765 (open-wbo-lsu) R 16762 16765 15659 0 -1 4202496 983 0 0 0 29 0 0 0 20 0 1 0 12001565 4763648 789 33554432000 4194304 6058637 140737358284576 140737358283304 4277640 0 0 4096 8404992 0 0 0 17 3 0 0 0 0 0
/proc/16765/statm: 1163 789 170 456 0 699 0
Current children cumulated CPU time (s) 0.29
Current children cumulated vsize (KiB) 4652

Solver just ended.
??? exit watcher main loop
??? sigkill at end of watcher main loop
??? kill 16765 sig 9
??? end of watcher thread
Dumping a history of the last processes samples

[startup+0.400216 s]
/proc/loadavg: 1.93 1.86 1.49 3/176 16765
/proc/meminfo: memFree=30245720/32872528 swapFree=242912/249044
[pid=16765] ppid=16762 vsize=5972 CPUtime=0.39 cores=1,3,5,7
/proc/16765/stat : 16765 (open-wbo-lsu) R 16762 16765 15659 0 -1 4202496 1215 0 0 0 39 0 0 0 20 0 1 0 12001565 6115328 1016 33554432000 4194304 6058637 140737358284576 140737358283304 4261422 0 0 4096 8404992 0 0 0 17 3 0 0 0 0 0
/proc/16765/statm: 1493 1016 170 456 0 1029 0
Current children cumulated CPU time (s) 0.39
Current children cumulated vsize (KiB) 5972

[startup+0.600227 s]
/proc/loadavg: 1.93 1.86 1.49 3/176 16765
/proc/meminfo: memFree=30245720/32872528 swapFree=242912/249044
[pid=16765] ppid=16762 vsize=6988 CPUtime=0.59 cores=1,3,5,7
/proc/16765/stat : 16765 (open-wbo-lsu) R 16762 16765 15659 0 -1 4202496 1487 0 0 0 59 0 0 0 20 0 1 0 12001565 7155712 1265 33554432000 4194304 6058637 140737358284576 140737358283304 4278328 0 0 4096 8404992 0 0 0 17 3 0 0 0 0 0
/proc/16765/statm: 1747 1265 170 456 0 1283 0
Current children cumulated CPU time (s) 0.59
Current children cumulated vsize (KiB) 6988

Child status: 20
Real time (s): 0.667349
CPU time (s): 0.667898
CPU user time (s): 0.661899
CPU system time (s): 0.005999
CPU usage (%): 100.082
Max. virtual memory (cumulated for all children) (KiB): 6988

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 0.661899
system time used= 0.005999
maximum resident set size= 5292
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 1549
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 0.001999 second user time and 0.005999 second system time

The end

Launcher Data 

Begin job on node103 at 2016-06-30 19:49:12
IDJOB=4120725
IDBENCH=110086
IDSOLVER=2545
FILE ID=node103/4120725-1467308952
RUNJOBID= node103-1467308727-15676
PBS_JOBID= 20005271
Free space on /tmp= 71708 MiB

SOLVER NAME= Open-WBO-LSU PB16
BENCH NAME= PB15eval/normalized-PB15eval/DEC-SMALLINT-LIN/ProofComplexity-Extracted-Cardinality-Constraints/ProofComplexity/normalized-tseitin-regular-n60-d3-i2-r1.cnf.gz-plain.pb.metafix.opb
COMMAND LINE= open-wbo-lsu BENCHNAME
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-4120725-1467308952/watcher-4120725-1467308952 -o /tmp/evaluation-result-4120725-1467308952/solver-4120725-1467308952 -C 1800 -W 1900 -M 15500 --bin-var /tmp/runsolver-exch-node103-1467308727-15676 --watchdog 1960  open-wbo-lsu HOME/instance-4120725-1467308952.opb

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

MD5SUM BENCH= f28443e989698cab5a2f0964edb3ac4d
RANDOM SEED=1611490040

node103.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		: 2666.456
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	: 5332.91
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		: 2666.456
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		: 2666.456
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	: 5332.54
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		: 2666.456
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		: 2666.456
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	: 5332.54
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		: 2666.456
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	: 5332.55
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		: 2666.456
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	: 5332.55
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		: 2666.456
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	: 5332.56
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:


/proc/meminfo:
MemTotal:       32872528 kB
MemFree:        30246504 kB
Buffers:          110080 kB
Cached:          1458796 kB
SwapCached:            0 kB
Active:           842840 kB
Inactive:         797036 kB
Active(anon):      66144 kB
Inactive(anon):     7416 kB
Active(file):     776696 kB
Inactive(file):   789620 kB
Unevictable:      249044 kB
Mlocked:          242912 kB
SwapTotal:      67108856 kB
SwapFree:       67108856 kB
Dirty:              4804 kB
Writeback:             0 kB
AnonPages:        319440 kB
Mapped:            14532 kB
Shmem:               204 kB
Slab:             608900 kB
SReclaimable:      52616 kB
SUnreclaim:       556284 kB
KernelStack:        1472 kB
PageTables:         4456 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    83545120 kB
Committed_AS:     424968 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      346412 kB
VmallocChunk:   34341988032 kB
HardwareCorrupted:     0 kB
AnonHugePages:     40960 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= 71704 MiB
End job on node103 at 2016-06-30 19:49:13