Trace number 3377434

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
borg-sat 11.03.02-seq-random (fixed)SAT 0.560914 0.631005

General information on the benchmark

Namerandom/medium/
unif-k3-r4.26-v700-c2982-S900569154-026.SATISFIABLE.cnf
MD5SUM90af97b0aabddb9e07bb7ada8a5dcbc1
Bench CategoryRANDOM (random instances)
Best result obtained on this benchmarkSAT
Best CPU time to get the best result obtained on this benchmark0.017996
Satisfiable
(Un)Satisfiability was proved
Number of variables700
Number of clauses2982
Sum of the clauses size8946
Maximum clause length3
Minimum clause length3
Number of clauses of size 10
Number of clauses of size 20
Number of clauses of size 32982
Number of clauses of size 40
Number of clauses of size 50
Number of clauses of size over 50

Solver Data 

0.32/0.45	c INFO: loaded portfolio from HOME/etc/borg-mix+class.random.pickle
0.32/0.45	c INFO: solving HOME/instance-3377434-1305453228.cnf
0.32/0.45	c INFO: computing task features
0.32/0.46	c INFO: computed variable-clause graph statistics
0.32/0.46	c INFO: computed clause balance statistics
0.42/0.51	c INFO: computed variable balance statistics
0.42/0.55	c INFO: computed small-clause counts
0.42/0.56	c INFO: computed Horn-clause counts
0.42/0.56	c INFO: computed variable graph statistics
0.42/0.56	c INFO: collected features for HOME/instance-3377434-1305453228.cnf in 0.11 s
0.42/0.57	c INFO: running gnovelty+2@0 for 97 with 2399 remaining (b = 0.58)
0.49/0.61	s SATISFIABLE
0.49/0.61	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 -483 484 485 486 487 -488 489 490 -491 -492 -493 494 495 -496 -497 498 -499 500 -501 502 -503 -504 -505 506 507 -508 -509 510 511 512 -513 -514 -515 -516 -517 -518 -519 -520 521 -522 -523 -524 525 -526 527 -528 529 -530 531 532 533 534 535 -536 537 538 -539 -540 541 -542 543 -544 -545 -546 -547 548 -549 -550 -551 -552 553 -554 -555 556 557 -558 559 560 -561 -562 -563 564 -565 566 567 -568 569 -570 -571 572 -573 -574 -575 -576 577 -578 579 -580 -581 -582 -583 -584 -585 -586 -587 588 589 590 -591 592 -593 -594 -595 -596 -597 -598 599 -600 601 602 603 -604 605 -606 -607 608 609 -610 611 -612 -613 -614 615 616 617 -618 619 620 -621 -622 623 624 -625 626 -627 -628 629 -630 631 632 633 -634 635 -636 -637 638 -639 640 -641 -642 643 644 -645 646 647 648 -649 650 -651 -652 -653 -654 655 656 657 -658 659 660 -661 662 663 -664 -665 -666 667 668 669 670 671 672 673 674 675 -676 677 678 -679 680 681 -682 683 684 685 -686 687 688 -689 690 691 692 693 -694 695 -696 697 -698 699 700 0

Verifier Data 

OK

Watcher Data 

runsolver Copyright (C) 2010-2011 Olivier ROUSSEL

This is runsolver version 3.3.0 (svn: 961)

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-3377434-1305453228/watcher-3377434-1305453228 -o /tmp/evaluation-result-3377434-1305453228/solver-3377434-1305453228 -C 2400 -W 1300 -M 7680 python HOME/solve HOME/etc/borg-mix+class.random.pickle HOME/instance-3377434-1305453228.cnf -seed 331704808 -budget 2400 

running on 2 cores: 1,3

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: 3.99 2.80 2.62 4/348 5003
/proc/meminfo: memFree=17249960/32950928 swapFree=67111348/67111528
[pid=5003] ppid=5001 vsize=15760 CPUtime=0 cores=1,3
/proc/5003/stat : 5003 (python) S 5001 5003 30479 0 -1 4202496 843 0 0 0 0 0 0 0 25 0 1 0 656922522 16138240 727 33554432000 4194304 5683644 140734438078624 18446744073709551615 274473965568 0 2147483391 16781312 2 18446744071699215550 0 0 17 1 0 0 0
/proc/5003/statm: 3941 728 334 364 0 428 0

[startup+0.0510019 s]
/proc/loadavg: 3.99 2.80 2.62 4/348 5003
/proc/meminfo: memFree=17249960/32950928 swapFree=67111348/67111528
[pid=5003] ppid=5001 vsize=30116 CPUtime=0.03 cores=1,3
/proc/5003/stat : 5003 (python) R 5001 5003 30479 0 -1 4202496 1484 0 0 0 3 0 0 0 25 0 1 0 656922522 30838784 1324 33554432000 4194304 5683644 140734438078624 18446744073709551615 4990227 0 0 16781312 2 0 0 0 17 1 0 0 0
/proc/5003/statm: 7529 1326 443 364 0 899 0
Current children cumulated CPU time (s) 0.03
Current children cumulated vsize (KiB) 30116

[startup+0.100994 s]
/proc/loadavg: 3.99 2.80 2.62 4/348 5003
/proc/meminfo: memFree=17249960/32950928 swapFree=67111348/67111528
[pid=5003] ppid=5001 vsize=104612 CPUtime=0.07 cores=1,3
/proc/5003/stat : 5003 (python) S 5001 5003 30479 0 -1 4202496 3142 0 0 0 6 1 0 0 17 0 1 0 656922522 107122688 2821 33554432000 4194304 5683644 140734438078624 18446744073709551615 274473965568 0 2147483391 16781312 2 18446744071699215550 0 0 17 1 0 0 0
/proc/5003/statm: 26153 2821 847 364 0 1901 0
Current children cumulated CPU time (s) 0.07
Current children cumulated vsize (KiB) 104612

[startup+0.308055 s]
/proc/loadavg: 3.99 2.80 2.62 4/348 5003
/proc/meminfo: memFree=17249960/32950928 swapFree=67111348/67111528
[pid=5003] ppid=5001 vsize=198916 CPUtime=0.24 cores=1,3
/proc/5003/stat : 5003 (python) R 5001 5003 30479 0 -1 4202496 7026 932 1 0 19 5 0 0 17 0 1 0 656922522 203689984 5053 33554432000 4194304 5683644 140734438078624 18446744073709551615 4620076 0 0 16781312 2 0 0 0 17 1 0 0 0
/proc/5003/statm: 49729 5053 1466 364 0 3756 0
Current children cumulated CPU time (s) 0.24
Current children cumulated vsize (KiB) 198916

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

[startup+0.500922 s]
/proc/loadavg: 3.99 2.80 2.62 4/348 5003
/proc/meminfo: memFree=17249960/32950928 swapFree=67111348/67111528
[pid=5003] ppid=5001 vsize=278584 CPUtime=0.42 cores=1,3
/proc/5003/stat : 5003 (python) R 5001 5003 30479 0 -1 4202496 9383 932 1 0 34 8 0 0 17 0 1 0 656922522 285270016 7041 33554432000 4194304 5683644 140734438078624 18446744073709551615 47296538813413 0 0 16781312 2 0 0 0 17 1 0 0 0
/proc/5003/statm: 69646 7041 1826 364 0 5570 0
Current children cumulated CPU time (s) 0.42
Current children cumulated vsize (KiB) 278584

[startup+0.604907 s]
/proc/loadavg: 3.99 2.80 2.62 4/348 5003
/proc/meminfo: memFree=17249960/32950928 swapFree=67111348/67111528
[pid=5003] ppid=5001 vsize=288852 CPUtime=0.49 cores=1,3
/proc/5003/stat : 5003 (python) S 5001 5003 30479 0 -1 4202496 9804 932 1 0 41 8 0 0 19 0 2 0 656922522 295784448 7086 33554432000 4194304 5683644 140734438078624 18446744073709551615 274485794251 0 0 16781312 2 18446744073709551615 0 0 17 1 0 0 0
/proc/5003/statm: 72213 7086 1867 364 0 8131 0
Current children cumulated CPU time (s) 0.49
Current children cumulated vsize (KiB) 288852

Child status: 0
Real time (s): 0.631005
CPU time (s): 0.560914
CPU user time (s): 0.466929
CPU system time (s): 0.093985
CPU usage (%): 88.8922
Max. virtual memory (cumulated for all children) (KiB): 288852

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 0.466929
system time used= 0.093985
maximum resident set size= 0
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 16724
page faults= 1
swaps= 0
block input operations= 0
block output operations= 0
messages sent= 0
messages received= 0
signals received= 0
voluntary context switches= 987
involuntary context switches= 20

runsolver used 0.001999 second user time and 0.010998 second system time

The end

Launcher Data 

Begin job on node125 at 2011-05-15 11:53:48
IDJOB=3377434
IDBENCH=82743
IDSOLVER=1857
FILE ID=node125/3377434-1305453228
RUNJOBID= node125-1305452977-4767
PBS_JOBID= 13324855
Free space on /tmp= 73132 MiB

SOLVER NAME= borg-sat 11.03.02-seq-random (fixed)
BENCH NAME= SAT11/random/medium/unif-k3-r4.26-v700-c2982-S900569154-026.SATISFIABLE.cnf
COMMAND LINE= python DIR/solve DIR/etc/borg-mix+class.random.pickle BENCHNAME -seed RANDOMSEED -budget TIMEOUT
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-3377434-1305453228/watcher-3377434-1305453228 -o /tmp/evaluation-result-3377434-1305453228/solver-3377434-1305453228 -C 2400 -W 1300 -M 7680  python HOME/solve HOME/etc/borg-mix+class.random.pickle HOME/instance-3377434-1305453228.cnf -seed 331704808 -budget 2400

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

MD5SUM BENCH= 90af97b0aabddb9e07bb7ada8a5dcbc1
RANDOM SEED=331704808

node125.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		: 2666.828
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	: 5333.65
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		: 2666.828
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	: 5266.55
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		: 2666.828
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	: 5332.84
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		: 2666.828
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	: 5332.74
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		: 2666.828
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	: 5332.82
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		: 2666.828
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	: 5332.74
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		: 2666.828
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	: 5332.75
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		: 2666.828
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	: 5332.75
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: [8]


/proc/meminfo:
MemTotal:     32950928 kB
MemFree:      17250116 kB
Buffers:        280132 kB
Cached:        4709268 kB
SwapCached:          0 kB
Active:       11636124 kB
Inactive:      3677352 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:     32950928 kB
LowFree:      17250116 kB
SwapTotal:    67111528 kB
SwapFree:     67111348 kB
Dirty:           31844 kB
Writeback:           0 kB
AnonPages:    10324284 kB
Mapped:          37052 kB
Slab:           279572 kB
PageTables:      43396 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:  83586992 kB
Committed_AS: 57025060 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= 73100 MiB
End job on node125 at 2011-05-15 11:53:49