Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:08:14 2012

Optimize a model with 15342 rows, 4556 columns and 50248 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.47s
Presolved: 15407 rows, 4554 columns, 54279 nonzeros
Variable types: 0 continuous, 4554 integer (4554 binary)
Found heuristic solution: objective 67.0000000

Root relaxation: objective 2.000000e+00, 3129 iterations, 0.12 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                      65.0000000    2.00000  96.9%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
     0     0    3.00000    0 2942    5.00000    3.00000  40.0%     -    9s
     0     0    3.00000    0 2213    5.00000    3.00000  40.0%     -   12s
     0     0    3.00000    0 2209    5.00000    3.00000  40.0%     -   13s
     0     0    3.00000    0 2171    5.00000    3.00000  40.0%     -   16s
     0     0    3.00000    0 2170    5.00000    3.00000  40.0%     -   17s
     0     0    3.00000    0 2170    5.00000    3.00000  40.0%     -   23s
     0     2    3.00000    0 2170    5.00000    3.00000  40.0%     -   36s
*   30     3              22       4.0000000    3.00000  25.0%   917   38s

Cutting planes:
  Clique: 32
  Zero half: 4

Explored 31 nodes (84348 simplex iterations) in 41.82 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%