Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:23:28 2012

Optimize a model with 21524 rows, 5700 columns and 69898 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.74s
Presolved: 21522 rows, 5698 columns, 69324 nonzeros
Variable types: 0 continuous, 5698 integer (5698 binary)
Found heuristic solution: objective 75.0000000

Root relaxation: objective 2.000000e+00, 4284 iterations, 0.19 seconds

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

     0     0    2.00000    0  150   75.00000    2.00000  97.3%     -    1s
H    0     0                      74.0000000    2.00000  97.3%     -    1s
H    0     0                       5.0000000    2.00000  60.0%     -    1s
     0     0    3.00000    0 3954    5.00000    3.00000  40.0%     -   13s
     0     0    3.00000    0 2984    5.00000    3.00000  40.0%     -   18s
     0     0    3.00000    0 2875    5.00000    3.00000  40.0%     -   19s
     0     0    3.00000    0 2907    5.00000    3.00000  40.0%     -   22s
     0     0    3.00000    0 2911    5.00000    3.00000  40.0%     -   30s
     0     0    3.00000    0  177    5.00000    3.00000  40.0%     -   43s
     0     0    3.00690    0 3688    5.00000    3.00690  39.9%     -   61s
H    0     0                       4.0000000    3.00690  24.8%     -   63s

Cutting planes:
  Clique: 53
  Zero half: 2

Explored 0 nodes (168683 simplex iterations) in 63.15 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%