Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:08:56 2012

Optimize a model with 15208 rows, 4556 columns and 49846 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.47s
Presolved: 15273 rows, 4554 columns, 53881 nonzeros
Variable types: 0 continuous, 4554 integer (4554 binary)
Found heuristic solution: objective 67.0000000

Root relaxation: objective 2.000000e+00, 3151 iterations, 0.11 seconds

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

     0     0    2.00000    0  134   67.00000    2.00000  97.0%     -    0s
H    0     0                      60.0000000    2.00000  96.7%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
H    0     0                       4.0000000    2.00000  50.0%     -    0s
     0     0    2.66667    0  377    4.00000    2.66667  33.3%     -    7s
     0     0    2.68063    0 4101    4.00000    2.68063  33.0%     -    7s
     0     0    2.68063    0 4101    4.00000    2.68063  33.0%     -   10s
     0     0    2.68063    0 3945    4.00000    2.68063  33.0%     -   13s
     0     0    2.68063    0 3931    4.00000    2.68063  33.0%     -   15s
     0     0    2.68063    0 3940    4.00000    2.68063  33.0%     -   17s
     0     0    2.68063    0 3834    4.00000    2.68063  33.0%     -   19s
     0     0    2.68063    0 3838    4.00000    2.68063  33.0%     -   21s
     0     0    2.68063    0 3846    4.00000    2.68063  33.0%     -   24s
     0     0    2.68063    0 3846    4.00000    2.68063  33.0%     -   25s
     0     1    3.00000    0 3846    4.00000    3.00000  25.0%     -   36s

Cutting planes:
  Clique: 204
  Zero half: 6

Explored 4 nodes (68700 simplex iterations) in 37.06 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%