Trace number 332631

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
Spear 2007-02-12SAT 189.391 189.544

General information on the benchmark

Namecrafted/Medium/contest05/pebbling/
sat-pbl-00400.sat05-1322.reshuffled-07.cnf
MD5SUM29cf0f53dfca3fe2e94789628bed3971
Bench CategoryCRAFTED (crafted instances)
Best result obtained on this benchmarkSAT
Best CPU time to get the best result obtained on this benchmark3.46547
Satisfiable
(Un)Satisfiability was proved
Number of variables1497
Number of clauses73374
Sum of the clauses size615277
Maximum clause length11
Minimum clause length1
Number of clauses of size 16
Number of clauses of size 242
Number of clauses of size 3337
Number of clauses of size 4413
Number of clauses of size 53127
Number of clauses of size over 569449

Solver Data (download as text)

0.00/0.00	c (*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*) 
0.00/0.00	c (*)                                             (*) 
0.00/0.00	c (*)          Spear theorem prover               (*) 
0.00/0.00	c (*)        Copyright (C) 2006,2007              (*) 
0.00/0.00	c (*)     Domagoj Babic. All rights reserved.     (*) 
0.00/0.00	c (*)                                             (*) 
0.00/0.00	c (*)     There is NO warranty, not even for      (*) 
0.00/0.00	c (*) merchantability or fitness for a particular (*) 
0.00/0.00	c (*)  purpose. Please run with --license to see  (*) 
0.00/0.00	c (*)              license details.               (*) 
0.00/0.00	c (*)                                             (*) 
0.00/0.00	c (*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*)(*) 
0.00/0.00	c 
0.00/0.00	c solving /tmp/evaluation/332631-1173484367/instance-332631-1173484367.cnf
189.24/189.40	s SATISFIABLE
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189.24/189.40	c runtime 189.36 [s]

Verifier Data (download as text)

OK

Watcher Data (download as text)

runsolver version 3.2.1 (c) roussel@cril.univ-artois.fr

command line: runsolver --timestamp -w ROOT/results/node7/watcher-332631-1173484367 -o ROOT/results/node7/solver-332631-1173484367 -C 1200 -W 2400 -M 1800 --output-limit 1,15 /tmp/evaluation/332631-1173484367/Spear-32 --model-stdout --time --dimacs /tmp/evaluation/332631-1173484367/instance-332631-1173484367.cnf 

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 1200 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 1230 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 2400 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: 0.92 0.97 0.97 3/77 15032
/proc/meminfo: memFree=1413848/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=1548 CPUtime=0
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 222 0 0 0 0 0 0 0 18 0 1 0 368391435 1585152 206 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 134866164 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 387 206 129 302 0 82 0

[startup+0.0216781 s]
/proc/loadavg: 0.92 0.97 0.97 3/77 15032
/proc/meminfo: memFree=1413848/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=1812 CPUtime=0.01
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 274 0 0 0 1 0 0 0 18 0 1 0 368391435 1855488 258 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 135258954 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 453 258 129 302 0 148 0
Current children cumulated CPU time (s) 0.01
Current children cumulated vsize (KiB) 1812

[startup+0.101686 s]
/proc/loadavg: 0.92 0.97 0.97 3/77 15032
/proc/meminfo: memFree=1413848/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=3052 CPUtime=0.09
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 555 0 0 0 9 0 0 0 18 0 1 0 368391435 3125248 539 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 135258954 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 763 539 129 302 0 458 0
Current children cumulated CPU time (s) 0.09
Current children cumulated vsize (KiB) 3052

[startup+0.301707 s]
/proc/loadavg: 0.92 0.97 0.97 3/77 15032
/proc/meminfo: memFree=1413848/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=5820 CPUtime=0.29
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 1289 0 0 0 28 1 0 0 19 0 1 0 368391435 5959680 1240 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 135258954 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 1455 1240 129 302 0 1150 0
Current children cumulated CPU time (s) 0.29
Current children cumulated vsize (KiB) 5820

[startup+0.70175 s]
/proc/loadavg: 0.92 0.97 0.97 3/77 15032
/proc/meminfo: memFree=1413848/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=8984 CPUtime=0.69
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 2094 0 0 0 66 3 0 0 22 0 1 0 368391435 9199616 1980 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 135258954 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 2246 1980 141 302 0 1941 0
Current children cumulated CPU time (s) 0.69
Current children cumulated vsize (KiB) 8984

[startup+1.50183 s]
/proc/loadavg: 0.92 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1405392/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=11712 CPUtime=1.49
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 2784 0 0 0 143 6 0 0 25 0 1 0 368391435 11993088 2670 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 2928 2670 141 302 0 2623 0
Current children cumulated CPU time (s) 1.49
Current children cumulated vsize (KiB) 11712

[startup+3.102 s]
/proc/loadavg: 0.93 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1401040/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=16696 CPUtime=3.09
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 4041 0 0 0 298 11 0 0 25 0 1 0 368391435 17096704 3894 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 4174 3894 141 302 0 3869 0
Current children cumulated CPU time (s) 3.09
Current children cumulated vsize (KiB) 16696

[startup+6.30134 s]
/proc/loadavg: 0.93 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1392336/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=24260 CPUtime=6.28
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 5913 0 0 0 611 17 0 0 25 0 1 0 368391435 24842240 5701 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 6065 5701 141 302 0 5760 0
Current children cumulated CPU time (s) 6.28
Current children cumulated vsize (KiB) 24260

[startup+12.702 s]
/proc/loadavg: 0.94 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1380816/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=37300 CPUtime=12.69
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 9212 0 0 0 1237 32 0 0 25 0 1 0 368391435 38195200 8871 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 9325 8871 141 302 0 9020 0
Current children cumulated CPU time (s) 12.69
Current children cumulated vsize (KiB) 37300

[startup+25.5013 s]
/proc/loadavg: 0.95 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1342224/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=75700 CPUtime=25.48
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 18752 0 0 0 2490 58 0 0 25 0 1 0 368391435 77516800 18154 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 18925 18154 141 302 0 18620 0
Current children cumulated CPU time (s) 25.48
Current children cumulated vsize (KiB) 75700

[startup+51.101 s]
/proc/loadavg: 0.96 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1311504/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=106800 CPUtime=51.08
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 26406 0 0 0 5014 94 0 0 25 0 1 0 368391435 109363200 25808 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 26700 25808 141 302 0 26395 0
Current children cumulated CPU time (s) 51.08
Current children cumulated vsize (KiB) 106800

[startup+102.305 s]
/proc/loadavg: 0.98 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1231824/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=188512 CPUtime=102.26
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 46627 0 0 0 10071 155 0 0 25 0 1 0 368391435 193036288 45516 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 47128 45516 141 302 0 46823 0
Current children cumulated CPU time (s) 102.26
Current children cumulated vsize (KiB) 188512

[startup+162.302 s]
/proc/loadavg: 0.99 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1166160/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=255892 CPUtime=162.24
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 63276 0 0 0 16008 216 0 0 25 0 1 0 368391435 262033408 62165 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 63973 62165 141 302 0 63668 0
Current children cumulated CPU time (s) 162.24
Current children cumulated vsize (KiB) 255892

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

[startup+166.301 s]
/proc/loadavg: 0.99 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1159696/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=261548 CPUtime=166.25
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 64653 0 0 0 16403 222 0 0 25 0 1 0 368391435 267825152 63542 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 65387 63542 141 302 0 65082 0
Current children cumulated CPU time (s) 166.25
Current children cumulated vsize (KiB) 261548

[startup+179.101 s]
/proc/loadavg: 0.99 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1140432/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=286308 CPUtime=179.04
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 70840 0 0 0 17672 232 0 0 25 0 1 0 368391435 293179392 68704 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 71577 68704 141 302 0 71272 0
Current children cumulated CPU time (s) 179.04
Current children cumulated vsize (KiB) 286308

[startup+185.502 s]
/proc/loadavg: 0.99 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1131984/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=293896 CPUtime=185.44
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 72727 0 0 0 18307 237 0 0 25 0 1 0 368391435 300949504 70591 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 73474 70591 141 302 0 73169 0
Current children cumulated CPU time (s) 185.44
Current children cumulated vsize (KiB) 293896

[startup+187.101 s]
/proc/loadavg: 0.99 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1129360/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=296000 CPUtime=187.04
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 73239 0 0 0 18465 239 0 0 25 0 1 0 368391435 303104000 71103 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 74000 71103 141 302 0 73695 0
Current children cumulated CPU time (s) 187.04
Current children cumulated vsize (KiB) 296000

[startup+188.701 s]
/proc/loadavg: 0.99 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1128016/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=298120 CPUtime=188.63
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 73734 0 0 0 18624 239 0 0 25 0 1 0 368391435 305274880 71598 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 74530 71598 141 302 0 74225 0
Current children cumulated CPU time (s) 188.63
Current children cumulated vsize (KiB) 298120

[startup+189.101 s]
/proc/loadavg: 0.99 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1126672/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=298512 CPUtime=189.04
/proc/15032/stat : 15032 (Spear-32) R 15030 15032 13940 0 -1 4194304 73840 0 0 0 18664 240 0 0 25 0 1 0 368391435 305676288 71704 18446744073709551615 134512640 135752790 4294956656 18446744073709551615 4294960144 0 0 4096 0 0 0 0 17 1 0 0
/proc/15032/statm: 74628 71704 141 302 0 74323 0
Current children cumulated CPU time (s) 189.04
Current children cumulated vsize (KiB) 298512

[startup+189.502 s]
/proc/loadavg: 0.99 0.97 0.97 2/78 15033
/proc/meminfo: memFree=1126672/2055920 swapFree=4147472/4192956
[pid=15032] ppid=15030 vsize=0 CPUtime=189.38
/proc/15032/stat : 15032 (Spear-32) D 15030 15032 13940 0 -1 4194308 73969 0 0 0 18693 245 0 0 25 0 1 0 368391435 0 0 18446744073709551615 0 0 0 0 0 0 2147483391 4096 0 18446744072099781622 0 0 17 1 0 0
/proc/15032/statm: 0 0 0 0 0 0 0
Current children cumulated CPU time (s) 189.38
Current children cumulated vsize (KiB) 0

Child status: 10
Real time (s): 189.544
CPU time (s): 189.391
CPU user time (s): 186.938
CPU system time (s): 2.45363
CPU usage (%): 99.9195
Max. virtual memory (cumulated for all children) (KiB): 298768

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 186.938
system time used= 2.45363
maximum resident set size= 0
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 73969
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= 7
involuntary context switches= 363

runsolver used 0.215967 second user time and 0.478927 second system time

The end

Launcher Data (download as text)

Begin job on node7 on Fri Mar  9 23:52:47 UTC 2007

IDJOB= 332631
IDBENCH= 24584
IDSOLVER= 133
FILE ID= node7/332631-1173484367

PBS_JOBID= 4101093

Free space on /tmp= 66483 MiB

SOLVER NAME= Spear 2007-02-12
BENCH NAME= HOME/pub/bench/SAT07/crafted/Medium/contest05/pebbling/sat-pbl-00400.sat05-1322.reshuffled-07.cnf
COMMAND LINE= /tmp/evaluation/332631-1173484367/Spear-32 --model-stdout --time --dimacs /tmp/evaluation/332631-1173484367/instance-332631-1173484367.cnf            
RUNSOLVER COMMAND LINE= runsolver  --timestamp  -w ROOT/results/node7/watcher-332631-1173484367 -o ROOT/results/node7/solver-332631-1173484367 -C 1200 -W 2400 -M 1800 --output-limit 1,15  /tmp/evaluation/332631-1173484367/Spear-32 --model-stdout --time --dimacs /tmp/evaluation/332631-1173484367/instance-332631-1173484367.cnf            

META MD5SUM SOLVER= 53b58dfa80430416a78fe762713f980c
MD5SUM BENCH=  29cf0f53dfca3fe2e94789628bed3971

RANDOM SEED= 5510705

TIME LIMIT= 1200 seconds
MEMORY LIMIT= 1800 MiB

Linux node7.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		: 3000.232
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		: 3000.232
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:       1414320 kB
Buffers:         50228 kB
Cached:         501504 kB
SwapCached:       8588 kB
Active:         233808 kB
Inactive:       340872 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      2055920 kB
LowFree:       1414320 kB
SwapTotal:     4192956 kB
SwapFree:      4147472 kB
Dirty:            4552 kB
Writeback:           0 kB
Mapped:          29992 kB
Slab:            52460 kB
Committed_AS:  1203028 kB
PageTables:       1764 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= 66483 MiB

End job on node7 on Fri Mar  9 23:55:57 UTC 2007