Trace number 3259811

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
sattime 2011-03-02SAT 2.09368 2.0943

General information on the benchmark

NameCRAFTED/sgi/
new-difficult-23-189-21-75.cnf
MD5SUM46a186d5aa9ba41a176adf24fb365342
Bench CategoryCRAFTED (crafted instances)
Best result obtained on this benchmarkSAT
Best CPU time to get the best result obtained on this benchmark0.203968
Satisfiable
(Un)Satisfiability was proved
Number of variables483
Number of clauses25396
Sum of the clauses size51233
Maximum clause length23
Minimum clause length2
Number of clauses of size 10
Number of clauses of size 225375
Number of clauses of size 30
Number of clauses of size 40
Number of clauses of size 50
Number of clauses of size over 521

Solver Data 

1.99/2.09	c 0 clauses are redundant and removed
1.99/2.09	c 0 vars are fixed and 0 clauses are removed after unit propagation
1.99/2.09	c 0 vars are fixed and 0 clauses are removed after lookahead
1.99/2.09	c initial seed is 1418862619
1.99/2.09	c try=1 flip j=1433299 walk=1347385 seed 1418862636
1.99/2.09	c A solution is found
1.99/2.09	s SATISFIABLE
1.99/2.09	v 1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23 -24 25 -26 -27 -28 -29 -30 -31 -32 -33 -34 -35 -36 -37 -38 -39 -40 -41 -42 -43 -44 -45 -46 -47 -48 -49 -50 51 -52 -53 -54 -55 -56 -57 -58 -59 -60 -61 -62 -63 -64 -65 -66 -67 -68 -69 -70 -71 -72 -73 -74 75 -76 -77 -78 -79 -80 -81 -82 -83 -84 -85 -86 -87 -88 -89 -90 -91 -92 -93 -94 -95 -96 -97 -98 99 -100 -101 -102 -103 -104 -105 -106 -107 -108 -109 -110 -111 -112 -113 -114 -115 -116 -117 -118 -119 -120 -121 -122 123 -124 -125 -126 -127 -128 -129 -130 -131 -132 -133 -134 -135 -136 -137 -138 -139 -140 -141 -142 -143 -144 -145 -146 147 -148 -149 -150 -151 -152 -153 -154 -155 -156 -157 -158 -159 -160 -161 -162 -163 -164 -165 -166 -167 -168 -169 -170 171 -172 -173 -174 -175 -176 -177 -178 -179 -180 -181 -182 -183 -184 -185 -186 -187 -188 -189 -190 -191 -192 -193 -194 195 -196 -197 -198 -199 -200 -201 -202 -203 -204 -205 -206 -207 -208 -209 -210 -211 -212 -213 -214 -215 -216 -217 -218 219 -220 -221 -222 -223 -224 -225 -226 -227 -228 -229 -230 -231 -232 -233 -234 -235 -236 -237 -238 -239 -240 -241 -242 243 -244 -245 -246 -247 -248 -249 -250 -251 -252 -253 -254 -255 -256 -257 -258 -259 -260 -261 -262 -263 -264 -265 -266 267 -268 -269 -270 -271 -272 -273 -274 -275 -276 -277 -278 -279 -280 -281 -282 -283 -284 -285 -286 -287 -288 -289 -290 291 -292 -293 -294 -295 -296 -297 -298 -299 -300 -301 -302 -303 -304 -305 -306 -307 -308 -309 -310 -311 -312 -313 -314 315 -316 -317 -318 -319 -320 -321 -322 -323 -324 -325 -326 -327 -328 -329 -330 -331 -332 -333 -334 -335 -336 -337 -338 339 -340 -341 -342 -343 -344 -345 -346 -347 -348 -349 -350 -351 -352 -353 -354 -355 -356 -357 -358 -359 -360 -361 -362 363 -364 -365 -366 -367 -368 -369 -370 -371 -372 -373 -374 -375 -376 -377 -378 -379 -380 -381 -382 -383 -384 -385 -386 387 -388 -389 -390 -391 -392 -393 -394 -395 -396 -397 -398 -399 -400 -401 -402 -403 -404 -405 -406 -407 -408 -409 -410 411 -412 -413 -414 -415 -416 -417 -418 -419 -420 -421 -422 -423 -424 -425 -426 -427 -428 -429 -430 -431 -432 -433 -434 435 -436 -437 -438 -439 -440 -441 -442 -443 -444 -445 -446 -447 -448 -449 -450 -451 -452 -453 -454 -455 -456 -457 -458 459 -460 -461 -462 -463 -464 -465 -466 -467 -468 -469 -470 -471 -472 -473 -474 -475 -476 -477 -478 -479 -480 -481 -482 483 
1.99/2.09	v 0 
1.99/2.09	c Done (mycputime is 2 seconds)

Verifier Data 

OK

Watcher Data 

runsolver Copyright (C) 2010-2011 Olivier ROUSSEL

This is runsolver version 3.3.0 (svn: 935)

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-3259811-1303506827/watcher-3259811-1303506827 -o /tmp/evaluation-result-3259811-1303506827/solver-3259811-1303506827 -C 2400 -W 1300 -M 7680 sattime HOME/instance-3259811-1303506827.cnf 1418862619 

running on 2 cores: 5,7

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 2400 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 2430 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 1300 seconds
Enforcing VSIZE limit (soft limit, will send SIGTERM then SIGKILL): 7864320 KiB
Enforcing VSIZE limit (hard limit, stack expansion will fail with SIGSEGV, brk() and mmap() will return ENOMEM): 7915520 KiB
Current StackSize limit: 10240 KiB


[startup+0 s]
/proc/loadavg: 3.71 3.95 3.91 2/176 8063
/proc/meminfo: memFree=21372980/32950928 swapFree=67111524/67111528
[pid=8063] ppid=8061 vsize=990668 CPUtime=0 cores=5,7
/proc/8063/stat : 8063 (sattime) R 8061 8063 7504 0 -1 4194304 387 0 0 0 0 0 0 0 22 0 1 0 462282406 1014444032 331 33554432000 4194304 4228548 140734355452416 18446744073709551615 208079893189 0 0 4096 0 0 0 0 17 5 0 0 0
/proc/8063/statm: 247667 331 101 9 0 244824 0

[startup+0.030778 s]
/proc/loadavg: 3.71 3.95 3.91 2/176 8063
/proc/meminfo: memFree=21372980/32950928 swapFree=67111524/67111528
[pid=8063] ppid=8061 vsize=992116 CPUtime=0.02 cores=5,7
/proc/8063/stat : 8063 (sattime) R 8061 8063 7504 0 -1 4202496 848 0 0 0 2 0 0 0 22 0 1 0 462282406 1015926784 791 33554432000 4194304 4228548 140734355452416 18446744073709551615 4207159 0 0 4096 0 0 0 0 17 5 0 0 0
/proc/8063/statm: 248029 791 104 9 0 245186 0
Current children cumulated CPU time (s) 0.02
Current children cumulated vsize (KiB) 992116

[startup+0.100767 s]
/proc/loadavg: 3.71 3.95 3.91 2/176 8063
/proc/meminfo: memFree=21372980/32950928 swapFree=67111524/67111528
[pid=8063] ppid=8061 vsize=993044 CPUtime=0.09 cores=5,7
/proc/8063/stat : 8063 (sattime) R 8061 8063 7504 0 -1 4202496 1320 0 0 0 9 0 0 0 22 0 1 0 462282406 1016877056 1262 33554432000 4194304 4228548 140734355452416 18446744073709551615 4217456 0 0 4096 0 0 0 0 17 5 0 0 0
/proc/8063/statm: 248261 1262 116 9 0 245418 0
Current children cumulated CPU time (s) 0.09
Current children cumulated vsize (KiB) 993044

[startup+0.300727 s]
/proc/loadavg: 3.71 3.95 3.91 2/176 8063
/proc/meminfo: memFree=21372980/32950928 swapFree=67111524/67111528
[pid=8063] ppid=8061 vsize=993044 CPUtime=0.29 cores=5,7
/proc/8063/stat : 8063 (sattime) R 8061 8063 7504 0 -1 4202496 1320 0 0 0 29 0 0 0 23 0 1 0 462282406 1016877056 1262 33554432000 4194304 4228548 140734355452416 18446744073709551615 4217544 0 0 4096 0 0 0 0 17 5 0 0 0
/proc/8063/statm: 248261 1262 116 9 0 245418 0
Current children cumulated CPU time (s) 0.29
Current children cumulated vsize (KiB) 993044

[startup+0.700653 s]
/proc/loadavg: 3.71 3.95 3.91 2/176 8063
/proc/meminfo: memFree=21372980/32950928 swapFree=67111524/67111528
[pid=8063] ppid=8061 vsize=993044 CPUtime=0.69 cores=5,7
/proc/8063/stat : 8063 (sattime) R 8061 8063 7504 0 -1 4202496 1320 0 0 0 69 0 0 0 25 0 1 0 462282406 1016877056 1262 33554432000 4194304 4228548 140734355452416 18446744073709551615 4218920 0 0 4096 0 0 0 0 17 5 0 0 0
/proc/8063/statm: 248261 1262 116 9 0 245418 0
Current children cumulated CPU time (s) 0.69
Current children cumulated vsize (KiB) 993044

[startup+1.5005 s]
/proc/loadavg: 3.71 3.95 3.91 4/185 8107
/proc/meminfo: memFree=21276752/32950928 swapFree=67111524/67111528
[pid=8063] ppid=8061 vsize=993044 CPUtime=1.49 cores=5,7
/proc/8063/stat : 8063 (sattime) R 8061 8063 7504 0 -1 4202496 1320 0 0 0 149 0 0 0 25 0 1 0 462282406 1016877056 1262 33554432000 4194304 4228548 140734355452416 18446744073709551615 4218697 0 0 4096 0 0 0 0 17 5 0 0 0
/proc/8063/statm: 248261 1262 116 9 0 245418 0
Current children cumulated CPU time (s) 1.49
Current children cumulated vsize (KiB) 993044

Solver just ended. Dumping a history of the last processes samples

[startup+1.90042 s]
/proc/loadavg: 3.71 3.95 3.91 4/185 8107
/proc/meminfo: memFree=21276752/32950928 swapFree=67111524/67111528
[pid=8063] ppid=8061 vsize=993044 CPUtime=1.89 cores=5,7
/proc/8063/stat : 8063 (sattime) R 8061 8063 7504 0 -1 4202496 1320 0 0 0 189 0 0 0 25 0 1 0 462282406 1016877056 1262 33554432000 4194304 4228548 140734355452416 18446744073709551615 4218978 0 0 4096 0 0 0 0 17 5 0 0 0
/proc/8063/statm: 248261 1262 116 9 0 245418 0
Current children cumulated CPU time (s) 1.89
Current children cumulated vsize (KiB) 993044

[startup+2.00041 s]
/proc/loadavg: 3.71 3.95 3.91 4/185 8107
/proc/meminfo: memFree=21276752/32950928 swapFree=67111524/67111528
[pid=8063] ppid=8061 vsize=993044 CPUtime=1.99 cores=5,7
/proc/8063/stat : 8063 (sattime) R 8061 8063 7504 0 -1 4202496 1320 0 0 0 199 0 0 0 25 0 1 0 462282406 1016877056 1262 33554432000 4194304 4228548 140734355452416 18446744073709551615 4218712 0 0 4096 0 0 0 0 17 5 0 0 0
/proc/8063/statm: 248261 1262 116 9 0 245418 0
Current children cumulated CPU time (s) 1.99
Current children cumulated vsize (KiB) 993044

Child status: 10
Real time (s): 2.0943
CPU time (s): 2.09368
CPU user time (s): 2.09268
CPU system time (s): 0.000999
CPU usage (%): 99.9706
Max. virtual memory (cumulated for all children) (KiB): 993044

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 2.09268
system time used= 0.000999
maximum resident set size= 0
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 1324
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= 4
involuntary context switches= 25

runsolver used 0.003999 second user time and 0.015997 second system time

The end

Launcher Data 

Begin job on node127 at 2011-04-22 23:13:47
IDJOB=3259811
IDBENCH=71805
IDSOLVER=1564
FILE ID=node127/3259811-1303506827
RUNJOBID= node127-1303506827-8050
PBS_JOBID= 13134211
Free space on /tmp= 71444 MiB

SOLVER NAME= sattime 2011-03-02
BENCH NAME= SAT09/CRAFTED/sgi/new-difficult-23-189-21-75.cnf
COMMAND LINE= sattime BENCHNAME RANDOMSEED
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-3259811-1303506827/watcher-3259811-1303506827 -o /tmp/evaluation-result-3259811-1303506827/solver-3259811-1303506827 -C 2400 -W 1300 -M 7680  sattime HOME/instance-3259811-1303506827.cnf 1418862619

TIME LIMIT= 2400 seconds
MEMORY LIMIT= 7680 MiB
NBCORE= 2

MD5SUM BENCH= 46a186d5aa9ba41a176adf24fb365342
RANDOM SEED=1418862619

node127.alineos.net Linux 2.6.18-164.el5 #1 SMP Thu Sep 3 03:28:30 EDT 2009

/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		: 2666.823
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 0
cpu cores	: 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5333.64
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.823
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 0
cpu cores	: 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.83
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 2
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.823
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 1
cpu cores	: 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.74
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 3
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.823
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 1
cpu cores	: 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.86
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 4
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.823
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 2
cpu cores	: 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.75
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 5
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.823
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 2
cpu cores	: 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.75
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 6
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.823
cache size	: 8192 KB
physical id	: 0
siblings	: 4
core id		: 3
cpu cores	: 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.60
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]

processor	: 7
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.823
cache size	: 8192 KB
physical id	: 1
siblings	: 4
core id		: 3
cpu cores	: 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm
bogomips	: 5332.83
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]


/proc/meminfo:
MemTotal:     32950928 kB
MemFree:      21373012 kB
Buffers:       1940124 kB
Cached:        9029068 kB
SwapCached:          4 kB
Active:        7049504 kB
Inactive:      3987388 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:     32950928 kB
LowFree:      21373012 kB
SwapTotal:    67111528 kB
SwapFree:     67111524 kB
Dirty:           10888 kB
Writeback:           0 kB
AnonPages:       67472 kB
Mapped:          14484 kB
Slab:           476672 kB
PageTables:       5188 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:  83586992 kB
Committed_AS:   192408 kB
VmallocTotal: 34359738367 kB
VmallocUsed:    296008 kB
VmallocChunk: 34359440975 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
Hugepagesize:     2048 kB

Free space on /tmp at the end= 71400 MiB
End job on node127 at 2011-04-22 23:13:50