Trace number 4268785

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
cosoco 1.12? (NS) 1.2180099 1.2764699

General information on the benchmark

NameScheduling/Scheduling-fs-taillard/
Taillard-fs-050-20-1.xml
MD5SUMfe7e3e2412edf0b59c3173e00c93d043
Bench CategoryCOP (optimization problem)
Best result obtained on this benchmark
Best value of the objective obtained on this benchmark
Best CPU time to get the best result obtained on this benchmark
Satisfiable
(Un)Satisfiability was proved
Number of variables1050
Number of constraints1070
Number of domains1
Minimum domain size3815
Maximum domain size3815
Distribution of domain sizes[{"size":3815,"count":1050}]
Minimum variable degree2
Maximum variable degree3
Distribution of variable degrees[{"degree":2,"count":50},{"degree":3,"count":1000}]
Minimum constraint arity1
Maximum constraint arity50
Distribution of constraint arities[{"arity":1,"count":50},{"arity":2,"count":1000},{"arity":50,"count":20}]
Number of extensional constraints0
Number of intensional constraints1050
Distribution of constraint types[{"type":"intension","count":1050},{"type":"noOverlap","count":20}]
Optimization problemYES
Type of objectivemin MAXIMUM

Solver Data 

1.13/1.26	c
1.13/1.26	c This is cosoco 1.12 --  
1.13/1.26	c
1.13/1.26	c command line: cosoco -lc -model -restarts HOME/instance-4268785-1502597429.xml 
1.13/1.26	Exception at line 1016
1.13/1.26	c nooverlap with int lengths constraint is not yet supported
1.13/1.26	s UNSUPPORTED

Verifier Data


Watcher Data 

runsolver version 3.4.0 (svn: 3012) Copyright (C) 2010-2013 Olivier ROUSSEL

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.

NUMA information:
  number of nodes: 2
  memory of node 0: 16374 MiB (15010 MiB free)
  memory of node 1: 16384 MiB (15402 MiB free)
  node distances:
     10  21
     21  10

command line: BIN/runsolver --timestamp -w /tmp/evaluation-result-4268785-1502597429/watcher-4268785-1502597429 -o /tmp/evaluation-result-4268785-1502597429/solver-4268785-1502597429 -C 264 -W 240 -M 15500 --bin-var /tmp/runsolver-exch-node125-1502596564-6280 --watchdog 300 cosoco -lc -model -restarts HOME/instance-4268785-1502597429.xml 

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
Linux 3.10.0-514.16.1.el7.x86_64
Starting watchdog thread
Current StackSize limit: 8192 KiB

solver pid=7165, runsolver pid=7162

[startup+0.100112 s]*
/proc/loadavg: 1.16 1.66 1.90 3/181 7166
/proc/meminfo: memFree=31101208/32770624 swapFree=67108860/67108860
[pid=7165] ppid=7162 vsize=61352 memory=37800 CPUtime=0.04 cores=0,2,4,6
/proc/7165/stat : 7165 (cosoco) R 7162 7165 897 0 -1 4202496 9640 0 0 0 3 1 0 0 20 0 1 0 61963631 62824448 9450 18446744073709551615 4194304 5972588 140722643670528 140722643667176 4967517 0 0 1 0 0 0 0 17 0 0 0 5 0 0 8070896 8075904 35655680 140722643673550 140722643673645 140722643673645 140722643677134 0
/proc/7165/statm: 15338 9450 786 435 0 8701 0
Current children cumulated CPU time: 0.04 s
Current children cumulated vsize: 61352 KiB
Current children cumulated memory: 37800 KiB

[startup+0.209278 s]*
/proc/loadavg: 1.16 1.66 1.90 3/181 7166
/proc/meminfo: memFree=31080004/32770624 swapFree=67108860/67108860
[pid=7165] ppid=7162 vsize=72344 memory=48664 CPUtime=0.14 cores=0,2,4,6
/proc/7165/stat : 7165 (cosoco) R 7162 7165 897 0 -1 4202496 12358 0 0 0 13 1 0 0 20 0 1 0 61963631 74080256 12166 18446744073709551615 4194304 5972588 140722643670528 140722643667176 140613357173733 0 0 1 0 0 0 0 17 0 0 0 5 0 0 8070896 8075904 35655680 140722643673550 140722643673645 140722643673645 140722643677134 0
/proc/7165/statm: 18086 12166 787 435 0 11449 0
Current children cumulated CPU time: 0.14 s
Current children cumulated vsize: 72344 KiB
Current children cumulated memory: 48664 KiB

[startup+0.309037 s]*
/proc/loadavg: 1.16 1.66 1.90 3/178 7170
/proc/meminfo: memFree=31135464/32770624 swapFree=67108860/67108860
[pid=7165] ppid=7162 vsize=82792 memory=58980 CPUtime=0.25 cores=0,2,4,6
/proc/7165/stat : 7165 (cosoco) R 7162 7165 897 0 -1 4202496 14970 0 0 0 23 2 0 0 20 0 1 0 61963631 84779008 14745 18446744073709551615 4194304 5972588 140722643670528 140722643667176 140613357173733 0 0 1 0 0 0 0 17 0 0 0 5 0 0 8070896 8075904 35655680 140722643673550 140722643673645 140722643673645 140722643677134 0
/proc/7165/statm: 20698 14745 787 435 0 14061 0
Current children cumulated CPU time: 0.25 s
Current children cumulated vsize: 82792 KiB
Current children cumulated memory: 58980 KiB

[startup+0.700264 s]
/proc/loadavg: 1.16 1.66 1.90 2/193 7194
/proc/meminfo: memFree=31102684/32770624 swapFree=67108860/67108860
[pid=7165] ppid=7162 vsize=125220 memory=101668 CPUtime=0.63 cores=0,2,4,6
/proc/7165/stat : 7165 (cosoco) R 7162 7165 897 0 -1 4202496 25608 0 0 0 60 3 0 0 20 0 1 0 61963631 128225280 25417 18446744073709551615 4194304 5972588 140722643670528 140722643662792 140613366983232 0 0 1 0 0 0 0 17 0 0 0 5 0 0 8070896 8075904 35655680 140722643673550 140722643673645 140722643673645 140722643677134 0
/proc/7165/statm: 31305 25417 787 435 0 24668 0
Current children cumulated CPU time: 0.63 s
Current children cumulated vsize: 125220 KiB
Current children cumulated memory: 101668 KiB

[startup+1.27641 s]
# the end of solver process 7165 was just reported to runsolver
# cumulated CPU time of all completed processes:  user=1.14801 s, system=0.07 s

Solver just ended.
??? end of watcher thread
Dumping a history of the last processes samples

[startup+0.800308 s]
/proc/loadavg: 1.16 1.66 1.90 2/193 7194
/proc/meminfo: memFree=31102684/32770624 swapFree=67108860/67108860
[pid=7165] ppid=7162 vsize=136436 memory=112756 CPUtime=0.73 cores=0,2,4,6
/proc/7165/stat : 7165 (cosoco) R 7162 7165 897 0 -1 4202496 28382 0 0 0 69 4 0 0 20 0 1 0 61963631 139710464 28189 18446744073709551615 4194304 5972588 140722643670528 140722643662792 140613366518944 0 0 1 0 0 0 0 17 0 0 0 5 0 0 8070896 8075904 35655680 140722643673550 140722643673645 140722643673645 140722643677134 0
/proc/7165/statm: 34109 28189 787 435 0 27472 0
Current children cumulated CPU time: 0.73 s
Current children cumulated vsize: 136436 KiB
Current children cumulated memory: 112756 KiB

[startup+1.20024 s]
/proc/loadavg: 1.16 1.66 1.90 2/175 7212
/proc/meminfo: memFree=31062660/32770624 swapFree=67108860/67108860
[pid=7165] ppid=7162 vsize=181192 memory=157508 CPUtime=1.13 cores=0,2,4,6
/proc/7165/stat : 7165 (cosoco) R 7162 7165 897 0 -1 4202496 39570 0 0 0 108 5 0 0 20 0 1 0 61963631 185540608 39377 18446744073709551615 4194304 5972588 140722643670528 140722643662792 140613357183000 0 0 1 0 0 0 0 17 0 0 0 5 0 0 8070896 8075904 35655680 140722643673550 140722643673645 140722643673645 140722643677134 0
/proc/7165/statm: 45298 39377 787 435 0 38661 0
Current children cumulated CPU time: 1.13 s
Current children cumulated vsize: 181192 KiB
Current children cumulated memory: 157508 KiB

Child status: 1
Real time (s): 1.27647
CPU time (s): 1.21801
CPU user time (s): 1.14801
CPU system time (s): 0.07
CPU usage (%): 95.4207
Max. virtual memory (cumulated for all children) (KiB): 181192
Max. memory (cumulated for all children) (KiB): 157508

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 1.14801
system time used= 0.07
maximum resident set size= 164604
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 41313
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= 6
involuntary context switches= 6


# summary of solver processes directly reported to runsolver:
#   pid: 7165
#   total CPU time (s): 1.21801
#   total CPU user time (s): 1.14801
#   total CPU system time (s): 0.07

??? join timestamper begins
??? join timestamper ends
??? end of timestamper thread
runsolver used 0.023664 second user time and 0.052258 second system time

The end

Launcher Data 

Begin job on node125 at 2017-08-13 05:56:24
IDJOB=4268785
IDBENCH=115666
IDSOLVER=2659
FILE ID=node125/4268785-1502597429
RUNJOBID= node125-1502596564-6280
PBS_JOBID= 
Free space on /tmp= 62028 MiB

SOLVER NAME= cosoco 1.12
BENCH NAME= XCSP17/Scheduling/Scheduling-fs-taillard/Taillard-fs-050-20-1.xml
COMMAND LINE= cosoco -lc -model -restarts BENCHNAME
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-4268785-1502597429/watcher-4268785-1502597429 -o /tmp/evaluation-result-4268785-1502597429/solver-4268785-1502597429 -C 264 -W 240 -M 15500 --bin-var /tmp/runsolver-exch-node125-1502596564-6280 --watchdog 300  cosoco -lc -model -restarts HOME/instance-4268785-1502597429.xml

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

MD5SUM BENCH= fe7e3e2412edf0b59c3173e00c93d043
RANDOM SEED=673228846

node125.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	: 5333.07
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	: 5332.55
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
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	: 5333.07
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	: 5332.55
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
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	: 5333.07
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	: 5332.55
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
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	: 5333.07
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	: 5332.55
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:


/proc/meminfo:
MemTotal:       32770624 kB
MemFree:        31146412 kB
MemAvailable:   31951704 kB
Buffers:          278816 kB
Cached:           823328 kB
SwapCached:            0 kB
Active:           630140 kB
Inactive:         570976 kB
Active(anon):      99264 kB
Inactive(anon):    33100 kB
Active(file):     530876 kB
Inactive(file):   537876 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:      67108860 kB
SwapFree:       67108860 kB
Dirty:              5280 kB
Writeback:             4 kB
AnonPages:         99220 kB
Mapped:            47288 kB
Shmem:             33444 kB
Slab:             130208 kB
SReclaimable:     104752 kB
SUnreclaim:        25456 kB
KernelStack:        3136 kB
PageTables:         5020 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    83494172 kB
Committed_AS:     378028 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:      118144 kB
DirectMap2M:    33427456 kB

Free space on /tmp at the end= 62028 MiB
End job on node125 at 2017-08-13 05:56:25