Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:25:07 2012

Optimize a model with 20099 rows, 5700 columns and 65623 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.71s
Presolved: 20097 rows, 5698 columns, 65087 nonzeros
Variable types: 0 continuous, 5698 integer (5698 binary)
Found heuristic solution: objective 75.0000000

Root relaxation: objective 2.000000e+00, 4114 iterations, 0.18 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                       5.0000000    2.00000  60.0%     -    1s
     0     0    2.66667    0  277    5.00000    2.66667  46.7%     -   12s
H    0     0                       4.0000000    2.66667  33.3%     -   13s
     0     0    2.67281    0 5029    4.00000    2.67281  33.2%     -   13s
     0     0    2.67281    0 5033    4.00000    2.67281  33.2%     -   16s
     0     0    2.67281    0 4571    4.00000    2.67281  33.2%     -   20s
     0     0    2.67281    0 4647    4.00000    2.67281  33.2%     -   22s
     0     0    2.67281    0 4654    4.00000    2.67281  33.2%     -   24s
     0     0    2.67281    0 4623    4.00000    2.67281  33.2%     -   27s
     0     0    2.67281    0 4619    4.00000    2.67281  33.2%     -   29s
     0     0    2.67281    0 4639    4.00000    2.67281  33.2%     -   31s
     0     0    2.67281    0 4647    4.00000    2.67281  33.2%     -   33s
     0     0    2.67281    0 4647    4.00000    2.67281  33.2%     -   34s
     0     1    3.00000    0 4647    4.00000    3.00000  25.0%     -   60s

Cutting planes:
  Clique: 157
  Zero half: 2

Explored 8 nodes (77953 simplex iterations) in 61.11 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%