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 in four parts:
  1. 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 provide some useful information on the computer.
  2. 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 !
  3. 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 1200 seconds. 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 1230 seconds which will send a SIGXPU to the solver. The last limit is on the virtual memory used by the process (900Mb).
    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.
  4. 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.

General information on the benchmark

Namemps-v2-20-10/ftp.netlib.org/lp/data/normalized-mps-v2-20-10-pilot4.opb
MD5SUM51b37b22b0e13f30b25801aa060ca6d7
Bench Categoryoptimization, big integers (OPTBIGINT)
Has Objective FunctionYES
SatisfiableNO
(Un)Satisfiability was proved
Best value of the objective function
Optimality of the best value was proved
Number of terms in the objective function 120
Biggest coefficient in the objective function 536870912
Number of bits for the biggest coefficient in the objective function 30
Sum of the numbers in the objective function 4294967292
Number of bits of the sum of numbers in the objective function 32
Biggest number in a constraint -3498116692108640256
Number of bits of the biggest number in a constraint 64
Biggest sum of numbers in a constraint 99417465468392882176
Number of bits of the biggest sum of numbers67
Best result obtained on this benchmarkUNSAT
Best CPU time to get the best result obtained on this benchmark14.1818
Number of variables26494
Total number of constraints657
Number of constraints which are clauses0
Number of constraints which are cardinality constraints (but not clauses)0
Number of constraints which are nor clauses,nor cardinality constraints657
Minimum length of a constraint10
Maximum length of a constraint1427

Trace number 2760

Launcher Data

LAUNCH ON wulflinc18 THE 2005-09-18 21:42:16 (client local time)
PB2005-SCRIPT v4.0 
MARKUPS: idlaunch=3963 boxname=wulflinc18 idbench=447 idsolver=4 numberseed=0
MD5SUM SOLVER: 21c3ffd7205c96d5f0784fd273b92938  /oldhome/oroussel/solvers/PBS4
MD5SUM BENCH:  51b37b22b0e13f30b25801aa060ca6d7  /oldhome/oroussel/tmp/wulflinc18/normalized-mps-v2-20-10-pilot4.opb
REAL COMMAND:  PBS4 /oldhome/oroussel/tmp/wulflinc18/normalized-mps-v2-20-10-pilot4.opb
IDLAUNCH: 3963
/proc/cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 7
model name	: Pentium III (Katmai)
stepping	: 3
cpu MHz		: 451.177
cache size	: 512 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips	: 888.83

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 7
model name	: Pentium III (Katmai)
stepping	: 3
cpu MHz		: 451.177
cache size	: 512 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips	: 899.07

/proc/meminfo:
MemTotal:      1034660 kB
MemFree:        923964 kB
Buffers:         23052 kB
Cached:          53216 kB
SwapCached:        844 kB
Active:          32572 kB
Inactive:        46352 kB
HighTotal:      131008 kB
HighFree:        74508 kB
LowTotal:       903652 kB
LowFree:        849456 kB
SwapTotal:     2097892 kB
SwapFree:      2096548 kB
Dirty:              28 kB
Writeback:           0 kB
Mapped:           5764 kB
Slab:            25964 kB
Committed_AS:    64184 kB
PageTables:        328 kB
VmallocTotal:   114680 kB
VmallocUsed:      1368 kB
VmallocChunk:   113252 kB
JOB ENDED THE 2005-09-18 21:42:23 (client local time) WITH STATUS 20 IN 6.94294 SECONDS
stats: 3963 7 6.94294 20

Solver Data

c PBS v4 by Bashar Al-Rawi & Fadi Aloul
c Solving /oldhome/oroussel/tmp/wulflinc18/normalized-mps-v2-20-10-pilot4.opb ......
s UNSATISFIABLE
c Done, CPU Time=0.061991

Watcher Data

Enforcing CPU limit (will send SIGTERM then SIGKILL): 1200 seconds
Enforcing CPUTime (will send SIGXCPU) limit: 1230 seconds
Enforcing Stack size limit: 67108864 bytes
Enforcing memory limit (will send SIGTERM then SIGKILL): 921600 Kb
Enforcing VSIZE limit: 994918400 bytes
Current StackSize limit: 67108864 bytes
Raw data (/proc/6829/stat): 6829 (PBS4) R 6828 6829 31027 0 -1 0 18 0 0 0 0 0 0 0 22 0 1 0 1844545794 978944 2 4294967295 134512640 135450776 3221224560 3221224560 134512960 0 0 5 0 0 0 0 17 0 0 0
Raw data (/proc/6829/statm): 239 2 232 232 0 7 0
[pid=6829] vsize: 956
open syscall for file /dev/null
open syscall for file /oldhome/oroussel/tmp/wulflinc18/normalized-mps-v2-20-10-pilot4.opb
open syscall for file /oldhome/oroussel/tmp/wulflinc18/normalized-mps-v2-20-10-pilot4.opb
One traced child (pid=6829) exited with status: 20
All traced children have exited ! Game is over.

Child status: 20
Real time (s): 6.98212
CPU time (s): 6.94294
CPU user time (s): 6.82696
CPU system time (s): 0.115982
CPU usage (%): 99.4389
Max. virtual memory (cumulated for all children) (Kb): 0

Verifier Data

ERROR: no interpretation found !