Trace number 372058

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, and are wall clock time (not CPU 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
March KS 2007-02-08SAT 64.6882 64.7142

General information on the benchmark

Namerandom/2+p/p0.8/v2405/
unif2p-p0.8-v2405-c7479-S476496922-18-SAT.cnf
MD5SUM7aa5e97b8e61908955474a79af64353f
Bench CategoryRANDOM (random instances)
Best result obtained on this benchmarkSAT
Best CPU time to get the best result obtained on this benchmark0.076987
Satisfiable
(Un)Satisfiability was proved
Number of variables2405
Number of clauses7478
Sum of the clauses size20939
Maximum clause length3
Minimum clause length2
Number of clauses of size 10
Number of clauses of size 21495
Number of clauses of size 35983
Number of clauses of size 40
Number of clauses of size 50
Number of clauses of size over 50

Solver Data (download as text)

0.01/0.09	c main():: ***                                   [ march satisfiability solver ]                                   ***
0.01/0.09	c main()::  **            Copyright (C) 2001-2004 M. Dufour, M. Heule, J. van Zwieten and H. van Maaren            **
0.01/0.09	c main()::   * This program may be redistributed and/or modified under the terms of the GNU Gereral Public License *
0.01/0.09	c main()::
0.01/0.09	c initFormula():: searching for DIMACS p-line....
0.01/0.09	c initFormula():: the DIMACS p-line indicates a CNF of 2405 variables and 7478 clauses.
0.01/0.09	c parseCNF():: parsing....
0.01/0.09	c parseCNF():: the CNF contains 0 unary clauses.
0.01/0.09	c runParser():: parsing was successful, warming up engines...
0.01/0.09	c find_and_remove_tautogolies():: found and removed 1 tautologies
0.01/0.09	c simplify_formula():: removed 0 tautological, 312 satisfied and 0 duplicate clauses
0.01/0.09	c preprocessing fase I completed:: there are now 2335 free variables and 7166 clauses.
0.01/0.09	c stat :: sign balance is biased by 0.664
0.01/0.09	c shorten_equivalence(): average equivalence length reduced from nan to nan
0.01/0.09	c using 3-SAT heuristics (occurence based diff)
0.01/0.09	c longest clause has size 3
0.01/0.09	c simplify_formula():: removed 0 tautological, 0 satisfied and 66 duplicate clauses
0.01/0.09	c resolvent_look() :: found 28 resolvents
0.01/0.09	c lessRedundantTransformation():: nothing to be done.
0.01/0.09	c transformTo3SAT():: you gave me 2405 variables and 7194 clauses.
0.01/0.09	c transformTo3SAT():: by the way, the maximal clause length before transformation was 3.
0.01/0.09	c transformTo3SAT():: I will add 0 variables and 0 clauses!
0.01/0.09	c transformTo3SAT():: the transformation yielded 2405 variabels and 7194 clauses.
0.01/0.09	c main():: clause / variable ratio: ( 7194 / 2405 ) = 2.99
0.01/0.09	c longest clause has size 3
0.01/0.09	c simplify_formula():: removed 0 tautological, 0 satisfied and 0 duplicate clauses
0.01/0.09	c dynamic_preselect_setsize :: on
0.01/0.09	c suggested doublelook initial :: 0
0.01/0.09	c main():: all systems go!
0.01/0.09	c |----------------------------------------------------------------|
c |*
c |**
c |****
c |********
c |****************
c |********************************
c |****************************************************************| 0 NC: 213 JD: 10
2.59/2.63	c |----------------------------------------------------------------|
c |*
c |**
c |****
c |********
c |****************
c |********************************
64.66/64.70	c solution bin :: 0100000000.0000000000000010010000
64.66/64.70	c direction branchin :: current_rights = 10
64.66/64.70	
c |********************************
64.66/64.71	c
64.66/64.71	c main():: nodeCount: 17367
64.66/64.71	c main():: dead ends in main: 40
64.66/64.71	c main():: lookAheadCount: 3815165
64.66/64.71	c main():: unitResolveCount: 801984
64.66/64.71	c main():: time=64.680000
64.66/64.71	c main():: necessary_assignments: 15599
64.66/64.71	c main():: bin_sat: 0, bin_unsat 0
64.66/64.71	c main():: doublelook: #: 111706, succes #: 87791
64.66/64.71	c main():: doublelook: overall 2.991 of all possible doublelooks executed
64.66/64.71	c main():: doublelook: succesrate: 78.591, average DL_trigger: 16653.867
64.66/64.71	c main():: SOLUTION VERIFIED :-)
64.66/64.71	s SATISFIABLE
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Verifier Data (download as text)

OK

Watcher Data (download as text)

runsolver version 3.2.3 (c) roussel@cril.univ-artois.fr

command line: runsolver --timestamp -w ROOT/results/node40/watcher-372058-1177549462 -o ROOT/results/node40/solver-372058-1177549462 -C 5000 -W 7500 -M 1800 --output-limit 1,15 /tmp/evaluation/372058-1177549462/march_ks /tmp/evaluation/372058-1177549462/instance-372058-1177549462.cnf 

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 5000 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 5030 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 7500 seconds
Enforcing VSIZE limit (soft limit, will send SIGTERM then SIGKILL): 1843200 KiB
Enforcing VSIZE limit (hard limit, stack expansion will fail with SIGSEGV, brk() and mmap() will return ENOMEM): 1894400 KiB
Solver output will be limited to a maximum of 15728640 bytes. The first 1048576 bytes and the last 14680064 bytes will be preserved
Current StackSize limit: 10240 KiB


[startup+0 s]
/proc/loadavg: 0.91 0.95 0.90 3/77 4094
/proc/meminfo: memFree=1826032/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=920 CPUtime=0
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 137 0 0 0 0 0 0 0 18 0 1 0 83825796 942080 123 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134662703 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 230 123 47 123 0 105 0

[startup+0.015999 s]
/proc/loadavg: 0.91 0.95 0.90 3/77 4094
/proc/meminfo: memFree=1826032/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=1520 CPUtime=0.01
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 266 0 0 0 1 0 0 0 18 0 1 0 83825796 1556480 249 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134628916 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 380 249 50 123 0 255 0
Current children cumulated CPU time (s) 0.01
Current children cumulated vsize (KiB) 1520

[startup+0.102015 s]
/proc/loadavg: 0.91 0.95 0.90 3/77 4094
/proc/meminfo: memFree=1826032/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=3508 CPUtime=0.09
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 783 0 0 0 9 0 0 0 18 0 1 0 83825796 3592192 749 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134526463 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 877 749 72 123 0 752 0
Current children cumulated CPU time (s) 0.09
Current children cumulated vsize (KiB) 3508

[startup+0.301056 s]
/proc/loadavg: 0.91 0.95 0.90 3/77 4094
/proc/meminfo: memFree=1826032/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=3460 CPUtime=0.29
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 784 0 0 0 29 0 0 0 19 0 1 0 83825796 3543040 747 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134542380 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 865 747 73 123 0 740 0
Current children cumulated CPU time (s) 0.29
Current children cumulated vsize (KiB) 3460

[startup+0.701139 s]
/proc/loadavg: 0.91 0.95 0.90 3/77 4094
/proc/meminfo: memFree=1826032/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=3460 CPUtime=0.69
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 784 0 0 0 69 0 0 0 23 0 1 0 83825796 3543040 747 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134538194 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 865 747 73 123 0 740 0
Current children cumulated CPU time (s) 0.69
Current children cumulated vsize (KiB) 3460

[startup+1.50131 s]
/proc/loadavg: 0.91 0.95 0.90 2/78 4095
/proc/meminfo: memFree=1823272/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=3592 CPUtime=1.49
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 798 0 0 0 149 0 0 0 25 0 1 0 83825796 3678208 761 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134526533 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 898 761 73 123 0 773 0
Current children cumulated CPU time (s) 1.49
Current children cumulated vsize (KiB) 3592

[startup+3.10164 s]
/proc/loadavg: 0.91 0.95 0.90 2/78 4095
/proc/meminfo: memFree=1823144/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=3724 CPUtime=3.09
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 839 0 0 0 309 0 0 0 25 0 1 0 83825796 3813376 802 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134526463 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 931 802 73 123 0 806 0
Current children cumulated CPU time (s) 3.09
Current children cumulated vsize (KiB) 3724

[startup+6.30131 s]
/proc/loadavg: 0.92 0.95 0.90 2/78 4095
/proc/meminfo: memFree=1822760/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=3856 CPUtime=6.29
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 876 0 0 0 629 0 0 0 25 0 1 0 83825796 3948544 839 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134526432 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 964 839 73 123 0 839 0
Current children cumulated CPU time (s) 6.29
Current children cumulated vsize (KiB) 3856

[startup+12.7017 s]
/proc/loadavg: 0.93 0.95 0.90 2/78 4095
/proc/meminfo: memFree=1822568/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4252 CPUtime=12.69
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 930 0 0 0 1269 0 0 0 25 0 1 0 83825796 4354048 893 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134538215 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1063 893 73 123 0 938 0
Current children cumulated CPU time (s) 12.69
Current children cumulated vsize (KiB) 4252

[startup+25.5013 s]
/proc/loadavg: 0.94 0.96 0.91 2/78 4095
/proc/meminfo: memFree=1822376/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4384 CPUtime=25.48
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 987 0 0 0 2548 0 0 0 25 0 1 0 83825796 4489216 950 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134564744 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1096 950 73 123 0 971 0
Current children cumulated CPU time (s) 25.48
Current children cumulated vsize (KiB) 4384

[startup+51.1017 s]
/proc/loadavg: 0.96 0.96 0.91 2/78 4095
/proc/meminfo: memFree=1822248/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4648 CPUtime=51.07
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 1032 0 0 0 5107 0 0 0 25 0 1 0 83825796 4759552 995 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134542335 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1162 995 73 123 0 1037 0
Current children cumulated CPU time (s) 51.07
Current children cumulated vsize (KiB) 4648

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

[startup+57.502 s]
/proc/loadavg: 0.96 0.96 0.91 2/78 4095
/proc/meminfo: memFree=1822184/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4648 CPUtime=57.47
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 1041 0 0 0 5747 0 0 0 25 0 1 0 83825796 4759552 1004 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134538186 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1162 1004 73 123 0 1037 0
Current children cumulated CPU time (s) 57.47
Current children cumulated vsize (KiB) 4648

[startup+60.7017 s]
/proc/loadavg: 0.97 0.96 0.91 2/78 4095
/proc/meminfo: memFree=1822184/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4648 CPUtime=60.66
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 1046 0 0 0 6066 0 0 0 25 0 1 0 83825796 4759552 1009 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134542335 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1162 1009 73 123 0 1037 0
Current children cumulated CPU time (s) 60.66
Current children cumulated vsize (KiB) 4648

[startup+62.302 s]
/proc/loadavg: 0.97 0.96 0.91 2/78 4095
/proc/meminfo: memFree=1822184/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4648 CPUtime=62.26
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 1049 0 0 0 6226 0 0 0 25 0 1 0 83825796 4759552 1012 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134526443 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1162 1012 73 123 0 1037 0
Current children cumulated CPU time (s) 62.26
Current children cumulated vsize (KiB) 4648

[startup+63.9014 s]
/proc/loadavg: 0.97 0.96 0.91 2/78 4095
/proc/meminfo: memFree=1822184/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4648 CPUtime=63.86
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 1051 0 0 0 6386 0 0 0 25 0 1 0 83825796 4759552 1014 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134526496 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1162 1014 73 123 0 1037 0
Current children cumulated CPU time (s) 63.86
Current children cumulated vsize (KiB) 4648

[startup+64.3015 s]
/proc/loadavg: 0.97 0.96 0.91 2/78 4095
/proc/meminfo: memFree=1822184/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4648 CPUtime=64.26
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 1052 0 0 0 6426 0 0 0 25 0 1 0 83825796 4759552 1015 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134589731 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1162 1015 73 123 0 1037 0
Current children cumulated CPU time (s) 64.26
Current children cumulated vsize (KiB) 4648

[startup+64.7015 s]
/proc/loadavg: 0.97 0.96 0.91 2/78 4095
/proc/meminfo: memFree=1822184/2055920 swapFree=4157396/4192956
[pid=4094] ppid=4092 vsize=4660 CPUtime=64.66
/proc/4094/stat : 4094 (march_ks) R 4092 4094 3246 0 -1 4194304 1061 0 0 0 6466 0 0 0 25 0 1 0 83825796 4771840 1024 18446744073709551615 134512640 135019032 4294956672 18446744073709551615 134538578 0 0 4096 0 0 0 0 17 1 0 0
/proc/4094/statm: 1165 1024 73 123 0 1040 0
Current children cumulated CPU time (s) 64.66
Current children cumulated vsize (KiB) 4660

Child status: 10
Real time (s): 64.7142
CPU time (s): 64.6882
CPU user time (s): 64.6792
CPU system time (s): 0.008998
CPU usage (%): 99.9598
Max. virtual memory (cumulated for all children) (KiB): 4660

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 64.6792
system time used= 0.008998
maximum resident set size= 0
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 1065
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= 12
involuntary context switches= 1346

runsolver used 0.053991 second user time and 0.137979 second system time

The end

Launcher Data (download as text)

Begin job on node40 on Thu Apr 26 01:04:22 UTC 2007

IDJOB= 372058
IDBENCH= 20330
IDSOLVER= 180
FILE ID= node40/372058-1177549462

PBS_JOBID= 4696299

Free space on /tmp= 66507 MiB

SOLVER NAME= March KS 2007-02-08
BENCH NAME= HOME/pub/bench/SAT07/random/2+p/p0.8/v2405/unif2p-p0.8-v2405-c7479-S476496922-18-SAT.cnf
COMMAND LINE= /tmp/evaluation/372058-1177549462/march_ks /tmp/evaluation/372058-1177549462/instance-372058-1177549462.cnf            
RUNSOLVER COMMAND LINE= runsolver  --timestamp  -w ROOT/results/node40/watcher-372058-1177549462 -o ROOT/results/node40/solver-372058-1177549462 -C 5000 -W 7500 -M 1800 --output-limit 1,15  /tmp/evaluation/372058-1177549462/march_ks /tmp/evaluation/372058-1177549462/instance-372058-1177549462.cnf            

META MD5SUM SOLVER= d41d8cd98f00b204e9800998ecf8427e
MD5SUM BENCH=  7aa5e97b8e61908955474a79af64353f

RANDOM SEED= 733284397

TIME LIMIT= 5000 seconds
MEMORY LIMIT= 1800 MiB

Linux node40.alineos.net 2.6.9-22.EL.rootsmp #1 SMP Mon Oct 3 08:59:52 CEST 2005 x86_64 x86_64 x86_64 GNU/Linux

/proc/cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	:                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping	: 3
cpu MHz		: 3000.283
cache size	: 2048 KB
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
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 lm pni monitor ds_cpl cid cx16 xtpr
bogomips	: 5914.62
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	:                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping	: 3
cpu MHz		: 3000.283
cache size	: 2048 KB
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
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 lm pni monitor ds_cpl cid cx16 xtpr
bogomips	: 5586.94
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:


/proc/meminfo:
MemTotal:      2055920 kB
MemFree:       1826504 kB
Buffers:         38540 kB
Cached:         122208 kB
SwapCached:      16528 kB
Active:          85120 kB
Inactive:       101228 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      2055920 kB
LowFree:       1826504 kB
SwapTotal:     4192956 kB
SwapFree:      4157396 kB
Dirty:            2564 kB
Writeback:           0 kB
Mapped:          31084 kB
Slab:            28480 kB
Committed_AS:  1018280 kB
PageTables:       1932 kB
VmallocTotal: 536870911 kB
VmallocUsed:    264952 kB
VmallocChunk: 536605679 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

Free space on /tmp at the end= 66507 MiB

End job on node40 on Thu Apr 26 01:05:27 UTC 2007