Trace number 4268809

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) 1.19032 1.24023

General information on the benchmark

NameScheduling/Scheduling-js-taillard/
Taillard-js-050-20-9.xml
MD5SUMddafb9a8cc33bb4ebb1c12b838f3d57d
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 size3095
Maximum domain size3095
Distribution of domain sizes[{"size":3095,"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 

1.14/1.23	c
1.14/1.23	c This is cosoco 1.12 --  
1.14/1.23	c
1.14/1.23	c command line: cosoco -lc -model -restarts HOME/instance-4268809-1502597435.xml 
1.14/1.23	Exception at line 1016
1.14/1.23	c nooverlap with int lengths constraint is not yet supported
1.14/1.23	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 (15362 MiB free)
  node distances:
     10  21
     21  10

command line: BIN/runsolver --timestamp -w /tmp/evaluation-result-4268809-1502597435/watcher-4268809-1502597435 -o /tmp/evaluation-result-4268809-1502597435/solver-4268809-1502597435 -C 264 -W 240 -M 15500 --bin-var /tmp/runsolver-exch-node125-1502596564-6280 --watchdog 300 cosoco -lc -model -restarts HOME/instance-4268809-1502597435.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=7531, runsolver pid=7528

[startup+0.100531 s]*
/proc/loadavg: 1.31 1.68 1.91 3/181 7532
/proc/meminfo: memFree=31064148/32770624 swapFree=67108860/67108860
[pid=7531] ppid=7528 vsize=56360 memory=32704 CPUtime=0.05 cores=0,2,4,6
/proc/7531/stat : 7531 (cosoco) R 7528 7531 897 0 -1 4202496 8373 0 0 0 5 0 0 0 20 0 1 0 61964245 57712640 8176 18446744073709551615 4194304 5972588 140722298254304 140722298247864 140220335100115 0 0 1 0 0 0 0 17 0 0 0 4 0 0 8070896 8075904 22794240 140722298257870 140722298257965 140722298257965 140722298261454 0
/proc/7531/statm: 14090 8176 786 435 0 7453 0
Current children cumulated CPU time: 0.05 s
Current children cumulated vsize: 56360 KiB
Current children cumulated memory: 32704 KiB

[startup+0.209296 s]*
/proc/loadavg: 1.31 1.68 1.91 3/181 7532
/proc/meminfo: memFree=31046312/32770624 swapFree=67108860/67108860
[pid=7531] ppid=7528 vsize=65460 memory=41944 CPUtime=0.15 cores=0,2,4,6
/proc/7531/stat : 7531 (cosoco) R 7528 7531 897 0 -1 4202496 10649 0 0 0 15 0 0 0 20 0 1 0 61964245 67031040 10486 18446744073709551615 4194304 5972588 140722298254304 140722298247864 4967517 0 0 1 0 0 0 0 17 0 0 0 4 0 0 8070896 8075904 22794240 140722298257870 140722298257965 140722298257965 140722298261454 0
/proc/7531/statm: 16365 10486 787 435 0 9728 0
Current children cumulated CPU time: 0.15 s
Current children cumulated vsize: 65460 KiB
Current children cumulated memory: 41944 KiB

[startup+0.309208 s]*
/proc/loadavg: 1.31 1.68 1.91 3/181 7532
/proc/meminfo: memFree=31027140/32770624 swapFree=67108860/67108860
[pid=7531] ppid=7528 vsize=74876 memory=51184 CPUtime=0.26 cores=0,2,4,6
/proc/7531/stat : 7531 (cosoco) R 7528 7531 897 0 -1 4202496 13017 0 0 0 25 1 0 0 20 0 1 0 61964245 76673024 12796 18446744073709551615 4194304 5972588 140722298254304 140722298247864 4967517 0 0 1 0 0 0 0 17 0 0 0 4 0 0 8070896 8075904 22794240 140722298257870 140722298257965 140722298257965 140722298261454 0
/proc/7531/statm: 18719 12796 787 435 0 12082 0
Current children cumulated CPU time: 0.26 s
Current children cumulated vsize: 74876 KiB
Current children cumulated memory: 51184 KiB

[startup+0.700258 s]
/proc/loadavg: 1.31 1.68 1.91 3/176 7537
/proc/meminfo: memFree=31125776/32770624 swapFree=67108860/67108860
[pid=7531] ppid=7528 vsize=110324 memory=86560 CPUtime=0.64 cores=0,2,4,6
/proc/7531/stat : 7531 (cosoco) R 7528 7531 897 0 -1 4202496 21855 0 0 0 62 2 0 0 20 0 1 0 61964245 112971776 21640 18446744073709551615 4194304 5972588 140722298254304 140722298247864 140220334156773 0 0 1 0 0 0 0 17 0 0 0 4 0 0 8070896 8075904 22794240 140722298257870 140722298257965 140722298257965 140722298261454 0
/proc/7531/statm: 27581 21640 787 435 0 20944 0
Current children cumulated CPU time: 0.64 s
Current children cumulated vsize: 110324 KiB
Current children cumulated memory: 86560 KiB

[startup+1.24018 s]
# the end of solver process 7531 was just reported to runsolver
# cumulated CPU time of all completed processes:  user=1.14731 s, system=0.043011 s

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

[startup+0.800297 s]
/proc/loadavg: 1.31 1.68 1.91 3/176 7537
/proc/meminfo: memFree=31125776/32770624 swapFree=67108860/67108860
[pid=7531] ppid=7528 vsize=119744 memory=96064 CPUtime=0.74 cores=0,2,4,6
/proc/7531/stat : 7531 (cosoco) R 7528 7531 897 0 -1 4202496 24202 0 0 0 72 2 0 0 20 0 1 0 61964245 122617856 24016 18446744073709551615 4194304 5972588 140722298254304 140722298247864 4967517 0 0 1 0 0 0 0 17 0 0 0 4 0 0 8070896 8075904 22794240 140722298257870 140722298257965 140722298257965 140722298261454 0
/proc/7531/statm: 29936 24016 787 435 0 23299 0
Current children cumulated CPU time: 0.74 s
Current children cumulated vsize: 119744 KiB
Current children cumulated memory: 96064 KiB

[startup+1.20023 s]
/proc/loadavg: 1.31 1.68 1.91 2/178 7564
/proc/meminfo: memFree=31080276/32770624 swapFree=67108860/67108860
[pid=7531] ppid=7528 vsize=156796 memory=133288 CPUtime=1.14 cores=0,2,4,6
/proc/7531/stat : 7531 (cosoco) R 7528 7531 897 0 -1 4202496 33485 0 0 0 111 3 0 0 20 0 1 0 61964245 160559104 33322 18446744073709551615 4194304 5972588 140722298254304 140722298247864 5223954 0 0 1 0 0 0 0 17 0 0 0 4 0 0 8070896 8075904 22794240 140722298257870 140722298257965 140722298257965 140722298261454 0
/proc/7531/statm: 39199 33322 787 435 0 32562 0
Current children cumulated CPU time: 1.14 s
Current children cumulated vsize: 156796 KiB
Current children cumulated memory: 133288 KiB

Child status: 1
Real time (s): 1.24023
CPU time (s): 1.19032
CPU user time (s): 1.14731
CPU system time (s): 0.043011
CPU usage (%): 95.9758
Max. virtual memory (cumulated for all children) (KiB): 156796
Max. memory (cumulated for all children) (KiB): 133288

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 1.14731
system time used= 0.043011
maximum resident set size= 136204
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 34213
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= 3


# summary of solver processes directly reported to runsolver:
#   pid: 7531
#   total CPU time (s): 1.19032
#   total CPU user time (s): 1.14731
#   total CPU system time (s): 0.043011

??? join timestamper begins
??? join timestamper ends
??? end of timestamper thread
runsolver used 0.019166 second user time and 0.05649 second system time

The end

Launcher Data 

Begin job on node125 at 2017-08-13 05:56:30
IDJOB=4268809
IDBENCH=115747
IDSOLVER=2659
FILE ID=node125/4268809-1502597435
RUNJOBID= node125-1502596564-6280
PBS_JOBID= 
Free space on /tmp= 62028 MiB

SOLVER NAME= cosoco 1.12
BENCH NAME= XCSP17/Scheduling/Scheduling-js-taillard/Taillard-js-050-20-9.xml
COMMAND LINE= cosoco -lc -model -restarts BENCHNAME
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-4268809-1502597435/watcher-4268809-1502597435 -o /tmp/evaluation-result-4268809-1502597435/solver-4268809-1502597435 -C 264 -W 240 -M 15500 --bin-var /tmp/runsolver-exch-node125-1502596564-6280 --watchdog 300  cosoco -lc -model -restarts HOME/instance-4268809-1502597435.xml

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

MD5SUM BENCH= ddafb9a8cc33bb4ebb1c12b838f3d57d
RANDOM SEED=1218472389

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:        31103420 kB
MemAvailable:   31908760 kB
Buffers:          278820 kB
Cached:           823684 kB
SwapCached:            0 kB
Active:           672152 kB
Inactive:         570640 kB
Active(anon):     140884 kB
Inactive(anon):    33100 kB
Active(file):     531268 kB
Inactive(file):   537540 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:      67108860 kB
SwapFree:       67108860 kB
Dirty:              2436 kB
Writeback:             0 kB
AnonPages:        143064 kB
Mapped:            46352 kB
Shmem:             33444 kB
Slab:             129960 kB
SReclaimable:     104732 kB
SUnreclaim:        25228 kB
KernelStack:        3216 kB
PageTables:         4512 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    83494172 kB
Committed_AS:     420240 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      350232 kB
VmallocChunk:   34341910524 kB
HardwareCorrupted:     0 kB
AnonHugePages:      8192 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 05:56:31