Gurobi 5.0.1 (linux64) logging started Fri Nov 16 09:54:31 2012

Optimize a model with 15142 rows, 4556 columns and 49714 nonzeros
Presolve time: 0.12s
Presolved: 15142 rows, 4556 columns, 49865 nonzeros
Variable types: 0 continuous, 4556 integer (4556 binary)
Found heuristic solution: objective 43.0000000

Root relaxation: objective 2.000000e+00, 9172 iterations, 1.42 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0    2.00000    0  134   43.00000    2.00000  95.3%     -    1s
H    0     0                      16.0000000    2.00000  87.5%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    2.00000    0  134    5.00000    2.00000  60.0%     -    2s
     0     0    2.00000    0  134    5.00000    2.00000  60.0%     -    2s
     0     0    2.00000    0  134    5.00000    2.00000  60.0%     -    3s
     0     0    2.00000    0  134    5.00000    2.00000  60.0%     -    4s
     0     0    2.00000    0  134    5.00000    2.00000  60.0%     -    5s
     0     0    2.00000    0  134    5.00000    2.00000  60.0%     -    5s
     0     2    2.00000    0  134    5.00000    2.00000  60.0%     -    7s
     1     3    3.00000    1  504    5.00000    2.00000  60.0% 19551   14s
     2     4    3.00000    1  481    5.00000    3.00000  40.0% 16540   19s
     3     5    3.00000    2  394    5.00000    3.00000  40.0% 11323   20s
H   27     7                       4.0000000    3.00000  25.0%  1615   22s
    40     6     cutoff    8         4.00000    3.00000  25.0%  1515   25s

Cutting planes:
  Clique: 13

Explored 83 nodes (87454 simplex iterations) in 26.59 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%