Trace number 205057

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
sugar 0.40SAT 5.51 5.68063

General information on the benchmark

Namerandom/rand-2-30-15/
rand-2-30-15-306-230-17_ext.xml
MD5SUMdd5b263772f4a38a006a92659cde91df
Bench Category2-ARY-EXT (binary constraints in extension)
Best result obtained on this benchmarkSAT
Best CPU time to get the best result obtained on this benchmark0.146976
SatisfiableYES
(Un)Satisfiability was provedYES
Number of variables30
Number of constraints221
Maximum constraint arity2
Maximum domain size15
Number of constraints which are defined in extension221
Number of constraints which are defined in intension0
Global constraints used (with number of constraints)

Solver Data (download as text)

0.04	c # Sugar v0-40 (/tmp/evaluation/205057-1170096171/sugar-v0-40.jar)
0.04	
0.04	c # MAIN  BEGIN : /tmp/evaluation/205057-1170096171/unknown.xml [Mon Jan 29 19:42:52 2007]
0.04	c # CONVERT_XML  BEGIN : /tmp/evaluation/205057-1170096171/unknown.xml /tmp/evaluation/205057-1170096171/sugar26138.csp [Mon Jan 29 19:42:52 2007]
0.04	c # CMD : java -Xms200M -Xmx600M -jar /tmp/evaluation/205057-1170096171/sugar-v0-40.jar -convert /tmp/evaluation/205057-1170096171/unknown.xml /tmp/evaluation/205057-1170096171/sugar26138.csp
0.15	c BEGIN convert /tmp/evaluation/205057-1170096171/unknown.xml
0.51	c END convert (0.355045 seconds)
0.53	c # CONVERT_XML  END : /tmp/evaluation/205057-1170096171/sugar26138.csp 441983 bytes (0 seconds) [Mon Jan 29 19:42:52 2007]
0.53	c # CONVERT_XML  CPU : 0.46 = 0 + 0.01 + 0.42 + 0.03
0.53	
0.53	c # GENERATE_SAT  BEGIN : /tmp/evaluation/205057-1170096171/sugar26138.bcnf [Mon Jan 29 19:42:52 2007]
0.53	c # CMD : java -Xms200M -Xmx600M -jar /tmp/evaluation/205057-1170096171/sugar-v0-40.jar -bcnf -map /tmp/evaluation/205057-1170096171/sugar26138.map /tmp/evaluation/205057-1170096171/sugar26138.csp /tmp/evaluation/205057-1170096171/sugar26138.bcnf
0.68	c BEGIN parse /tmp/evaluation/205057-1170096171/sugar26138.csp
3.52	c END parse (2.845119 seconds)
3.52	c BEGIN simplify
3.54	c END simplify (0.022735 seconds)
3.54	c BEGIN encode /tmp/evaluation/205057-1170096171/sugar26138.bcnf
3.75	c END encode (0.206119 seconds)
3.79	c # GENERATE_SAT  END : 2554 variables 18270 clauses 1226424 bytes (3 seconds) [Mon Jan 29 19:42:55 2007]
3.79	c # GENERATE_SAT  CPU : 0.02 = 0.02 + 0 + 0 + 0
3.79	
3.79	c # SOLVE_SAT  BEGIN : /tmp/evaluation/205057-1170096171/sugar26138.bcnf [Mon Jan 29 19:42:55 2007]
3.79	c # CMD : /tmp/evaluation/205057-1170096171/minisat /tmp/evaluation/205057-1170096171/sugar26138.bcnf /tmp/evaluation/205057-1170096171/sugar26138.out
3.82	c ==================================[MINISAT]===================================
3.82	c | Conflicts |     ORIGINAL     |              LEARNT              | Progress |
3.82	c |           | Clauses Literals |   Limit Clauses Literals  Lit/Cl |          |
3.82	c ==============================================================================
3.82	c |         0 |   18270   288330 |    6090       0        0     nan |  0.000 % |
3.83	c |       101 |   18271   288330 |    6699     100     2840    28.4 |  0.000 % |
3.85	c |       251 |   18272   288330 |    7368     249     4622    18.6 |  0.003 % |
3.88	c |       476 |   18273   288330 |    8105     473     7199    15.2 |  0.003 % |
3.92	c |       813 |   18274   288330 |    8916     809    10995    13.6 |  0.003 % |
3.97	c |      1320 |   18276   288330 |    9808    1314    17265    13.1 |  0.004 % |
4.06	c |      2081 |   18281   288330 |   10788    2070    28694    13.9 |  0.006 % |
4.20	c |      3220 |   18177   287498 |   11867    1515    23059    15.2 |  1.057 % |
4.42	c |      4928 |   18182   287498 |   13054    3218    48029    14.9 |  1.058 % |
4.80	c |      7490 |   18186   287498 |   14359    5776    88225    15.3 |  1.060 % |
5.36	c |     11336 |   18103   287193 |   15795    6427   130626    20.3 |  1.175 % |
5.39	c ==============================================================================
5.39	c restarts              : 11
5.39	c conflicts             : 11494          (7253 /sec)
5.39	c decisions             : 26969          (17018 /sec)
5.39	c propagations          : 1895795        (1196267 /sec)
5.39	c conflict literals     : 202865         (50.07 % deleted)
5.39	c Memory used           : 4.11 MB
5.39	c CPU time              : 1.58476 s
5.39	c 
5.39	c SATISFIABLE
5.39	c # SOLVE_SAT  END : SATISFIABLE (2 seconds) [Mon Jan 29 19:42:57 2007]
5.39	c # SOLVE_SAT  CPU : 1.59 = 0 + 0 + 1.58 + 0.01
5.39	
5.39	c # RESULT : SATISFIABLE
5.39	
5.39	c # OUTPUT_SOL  BEGIN : SAT  [Mon Jan 29 19:42:57 2007]
5.50	c BEGIN read SAT output /tmp/evaluation/205057-1170096171/sugar26138.out
5.53	c END read SAT output (0.02676 seconds)
5.53	c BEGIN write solution /tmp/evaluation/205057-1170096171/sugar26138.sol
5.65	c END write solution (0.115159 seconds)
5.67	s SATISFIABLE
5.67	v 14 7 9 10 6 10 3 6 10 10 10 6 14 4 7 2 9 1 7 3 9 10 14 10 9 14 14 12 2 5
5.67	c # OUTPUT_SOL  END :  (0 seconds) [Mon Jan 29 19:42:57 2007]
5.67	c # OUTPUT_SOL  CPU : 0.25 = 0 + 0 + 0.23 + 0.02
5.67	
5.67	c # MAIN  END :  (5 seconds) [Mon Jan 29 19:42:57 2007]
5.67	c # MAIN  CPU : 2.32 = 0.02 + 0.01 + 2.23 + 0.06
5.67

Verifier Data (download as text)

OK

Watcher Data (download as text)

runsolver version 3.1.3 (c) roussel@cril.univ-artois.fr

command line: runsolver --timestamp -w ROOT/results/node35/watcher-205057-1170096171 -o ROOT/results/node35/solver-205057-1170096171 -C 1800 -M 900 /tmp/evaluation/205057-1170096171/solver /tmp/evaluation/205057-1170096171 /tmp/evaluation/205057-1170096171/unknown.xml 

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 1800 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 1830 seconds
Enforcing VSIZE limit (soft limit, will send SIGTERM then SIGKILL): 921600 KiB
Enforcing VSIZE limit (hard limit, stack expansion will fail with SIGSEGV, brk() and mmap() will return ENOMEM): 972800 KiB
Current StackSize limit: 10240 KiB

/proc/loadavg: 2.39 2.86 2.94 4/69 26139
/proc/meminfo: memFree=1501520/2055920 swapFree=4192956/4192956
[pid=26138] ppid=26135 vsize=3672 CPUtime=0
/proc/26138/stat : 26138 (sugar) R 26135 26138 25544 0 -1 4194304 302 0 0 0 0 0 0 0 18 0 1 0 3380878 3760128 38 18446744073709551615 4194304 4206940 548682069232 18446744073709551615 266131797385 0 0 4096 0 0 0 0 17 1 0 0
/proc/26138/statm: 1177 43 33 3 0 8 0

[startup+0.106854 s]
/proc/loadavg: 2.39 2.86 2.94 4/69 26139
/proc/meminfo: memFree=1501520/2055920 swapFree=4192956/4192956
[pid=26138] ppid=26135 vsize=13724 CPUtime=0.04
/proc/26138/stat : 26138 (sugar) S 26135 26138 25544 0 -1 4194304 1112 0 0 0 3 1 0 0 16 0 1 0 3380878 14053376 805 18446744073709551615 4194304 4206940 548682069232 18446744073709551615 266143314018 0 0 4224 16386 18446744071563648864 0 0 17 1 0 0
/proc/26138/statm: 3431 805 368 3 0 531 0
Current children cumulated CPU time (s) 0.04
Current children cumulated vsize (KiB) 13724

[startup+0.514937 s]
/proc/loadavg: 2.39 2.86 2.94 4/69 26139
/proc/meminfo: memFree=1501520/2055920 swapFree=4192956/4192956
[pid=26138] ppid=26135 vsize=13724 CPUtime=0.04
/proc/26138/stat : 26138 (sugar) S 26135 26138 25544 0 -1 4194304 1121 0 0 0 3 1 0 0 16 0 1 0 3380878 14053376 805 18446744073709551615 4194304 4206940 548682069232 18446744073709551615 266143314018 0 0 4224 16386 18446744071563648864 0 0 17 1 0 0
/proc/26138/statm: 3431 805 368 3 0 531 0
Current children cumulated CPU time (s) 0.04
Current children cumulated vsize (KiB) 13724

[startup+1.3361 s]
/proc/loadavg: 2.39 2.86 2.94 2/76 26155
/proc/meminfo: memFree=1475096/2055920 swapFree=4192956/4192956
[pid=26138] ppid=26135 vsize=13724 CPUtime=0.49
/proc/26138/stat : 26138 (sugar) S 26135 26138 25544 0 -1 4194304 1190 6857 0 1 3 1 42 3 15 0 1 0 3380878 14053376 809 18446744073709551615 4194304 4206940 548682069232 18446744073709551615 266143314018 0 0 4224 16386 18446744071563648864 0 0 17 0 0 0
/proc/26138/statm: 3431 809 371 3 0 531 0
[pid=26148] ppid=26138 vsize=807064 CPUtime=0.75
/proc/26148/stat : 26148 (java) R 26138 26138 25544 0 -1 0 8591 0 1 0 71 4 0 0 16 0 8 0 3380932 826433536 8337 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4072943000 0 4 0 23759 18446744073709551615 0 0 17 1 0 0
/proc/26148/statm: 201766 8337 1506 14 0 189044 0
[pid=26148/tid=26149] ppid=26138 vsize=807064 CPUtime=0.14
/proc/26148/task/26149/stat : 26149 (java) S 26138 26138 25544 0 -1 64 2506 0 0 0 13 1 0 0 16 0 8 0 3380938 826433536 8337 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 0 0 23759 0 0 0 -1 1 0 0
[pid=26148/tid=26150] ppid=26138 vsize=807064 CPUtime=0
/proc/26148/task/26150/stat : 26150 (java) S 26138 26138 25544 0 -1 64 11 0 0 0 0 0 0 0 15 0 8 0 3380938 826433536 8337 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26151] ppid=26138 vsize=807064 CPUtime=0
/proc/26148/task/26151/stat : 26151 (java) S 26138 26138 25544 0 -1 64 5 0 0 0 0 0 0 0 15 0 8 0 3380938 826433536 8337 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26152] ppid=26138 vsize=807064 CPUtime=0
/proc/26148/task/26152/stat : 26152 (java) S 26138 26138 25544 0 -1 64 1 0 0 0 0 0 0 0 22 0 8 0 3380941 826433536 8337 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26153] ppid=26138 vsize=807064 CPUtime=0.06
/proc/26148/task/26153/stat : 26153 (java) S 26138 26138 25544 0 -1 64 297 0 0 0 6 0 0 0 16 0 8 0 3380941 826433536 8337 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26154] ppid=26138 vsize=807064 CPUtime=0
/proc/26148/task/26154/stat : 26154 (java) S 26138 26138 25544 0 -1 64 2 0 0 0 0 0 0 0 23 0 8 0 3380941 826433536 8337 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26155] ppid=26138 vsize=807064 CPUtime=0
/proc/26148/task/26155/stat : 26155 (java) S 26138 26138 25544 0 -1 64 0 0 0 0 0 0 0 0 15 0 8 0 3380942 826433536 8337 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
Current children cumulated CPU time (s) 1.24
Current children cumulated vsize (KiB) 820788

[startup+2.98343 s]
/proc/loadavg: 2.28 2.82 2.93 2/76 26157
/proc/meminfo: memFree=1463064/2055920 swapFree=4192956/4192956
[pid=26138] ppid=26135 vsize=13724 CPUtime=0.49
/proc/26138/stat : 26138 (sugar) S 26135 26138 25544 0 -1 4194304 1190 6857 0 1 3 1 42 3 15 0 1 0 3380878 14053376 809 18446744073709551615 4194304 4206940 548682069232 18446744073709551615 266143314018 0 0 4224 16386 18446744071563648864 0 0 17 0 0 0
/proc/26138/statm: 3431 809 371 3 0 531 0
[pid=26148] ppid=26138 vsize=807332 CPUtime=2.4
/proc/26148/stat : 26148 (java) R 26138 26138 25544 0 -1 0 14096 0 1 0 232 8 0 0 16 0 8 0 3380932 826707968 13802 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4153380128 0 4 0 23759 18446744073709551615 0 0 17 1 0 0
/proc/26148/statm: 201833 13802 1506 14 0 189111 0
[pid=26148/tid=26149] ppid=26138 vsize=807332 CPUtime=0.42
/proc/26148/task/26149/stat : 26149 (java) S 26138 26138 25544 0 -1 64 7859 0 0 0 38 4 0 0 16 0 8 0 3380938 826707968 13802 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 0 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26150] ppid=26138 vsize=807332 CPUtime=0
/proc/26148/task/26150/stat : 26150 (java) S 26138 26138 25544 0 -1 64 11 0 0 0 0 0 0 0 15 0 8 0 3380938 826707968 13802 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26151] ppid=26138 vsize=807332 CPUtime=0
/proc/26148/task/26151/stat : 26151 (java) S 26138 26138 25544 0 -1 64 5 0 0 0 0 0 0 0 15 0 8 0 3380938 826707968 13802 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26152] ppid=26138 vsize=807332 CPUtime=0
/proc/26148/task/26152/stat : 26152 (java) S 26138 26138 25544 0 -1 64 1 0 0 0 0 0 0 0 22 0 8 0 3380941 826707968 13802 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26153] ppid=26138 vsize=807332 CPUtime=0.13
/proc/26148/task/26153/stat : 26153 (java) S 26138 26138 25544 0 -1 64 405 0 0 0 13 0 0 0 16 0 8 0 3380941 826707968 13802 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26154] ppid=26138 vsize=807332 CPUtime=0
/proc/26148/task/26154/stat : 26154 (java) S 26138 26138 25544 0 -1 64 2 0 0 0 0 0 0 0 23 0 8 0 3380941 826707968 13802 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 0 0 0
[pid=26148/tid=26155] ppid=26138 vsize=807332 CPUtime=0
/proc/26148/task/26155/stat : 26155 (java) S 26138 26138 25544 0 -1 64 0 0 0 0 0 0 0 0 15 0 8 0 3380942 826707968 13802 18446744073709551615 134512640 134570532 4294956480 18446744073709551615 4294960144 0 4 0 23759 0 0 0 -1 1 0 0
Current children cumulated CPU time (s) 2.89
Current children cumulated vsize (KiB) 821056

Child status: 0

!!! problem with CPU time !!!
wait4(...,&childrusage) returns 26138 and gives childrusage.ru_utime.tv_sec=2 childrusage.ru_utime.tv_usec=287652 childrusage.ru_stime.tv_sec=0 childrusage.ru_stime.tv_usec=84987
CPU time returned by wait4() is 2.37264
while last known CPU time is 5.51

Solver probably didn't/couldn't wait for its children
Using last known CPU time as value...

Real time (s): 5.68063
CPU time (s): 5.51
CPU user time (s): 5.34
CPU system time (s): 0.17
CPU usage (%): 96.9963
Max. virtual memory (cumulated for all children) (KiB): 821988

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 2.28765
system time used= 0.084987
maximum resident set size= 0
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 13198
page faults= 2
swaps= 0
block input operations= 0
block output operations= 0
messages sent= 0
messages received= 0
signals received= 0
voluntary context switches= 702
involuntary context switches= 149

runsolver used 0.005999 s user time and 0.025996 s system time

The end

Launcher Data (download as text)

Begin job on node35 on Mon Jan 29 18:42:52 UTC 2007


IDJOB= 205057
IDBENCH= 4099
IDSOLVER= 86
FILE ID= node35/205057-1170096171

PBS_JOBID= 3689617

Free space on /tmp= 66564 MiB

SOLVER NAME= sugar 0.40
BENCH NAME= HOME/pub/bench/CPAI06/random/rand-2-30-15/rand-2-30-15-306-230-17_ext.xml
COMMAND LINE= /tmp/evaluation/205057-1170096171/solver /tmp/evaluation/205057-1170096171 /tmp/evaluation/205057-1170096171/unknown.xml
RUNSOLVER COMMAND LINE= runsolver  --timestamp  -w ROOT/results/node35/watcher-205057-1170096171 -o ROOT/results/node35/solver-205057-1170096171 -C 1800 -M 900  /tmp/evaluation/205057-1170096171/solver /tmp/evaluation/205057-1170096171 /tmp/evaluation/205057-1170096171/unknown.xml

META MD5SUM SOLVER= 0a27e717dfe98d83d9802fe0eea45073
MD5SUM BENCH=  dd5b263772f4a38a006a92659cde91df

RANDOM SEED= 85722738

TIME LIMIT= 1800 seconds

MEMORY LIMIT= 900 MiB


/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		: 3000.263
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		: 3000.263
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:       1502072 kB
Buffers:         34336 kB
Cached:         427860 kB
SwapCached:          0 kB
Active:         146720 kB
Inactive:       336904 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      2055920 kB
LowFree:       1502072 kB
SwapTotal:     4192956 kB
SwapFree:      4192956 kB
Dirty:            1012 kB
Writeback:           0 kB
Mapped:          31624 kB
Slab:            55940 kB
Committed_AS:    83852 kB
PageTables:       1628 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= 66563 MiB



End job on node35 on Mon Jan 29 18:42:59 UTC 2007