Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:23:09 2012

Optimize a model with 9221 rows, 3422 columns and 30796 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.21s
Presolved: 9219 rows, 3420 columns, 30478 nonzeros
Variable types: 0 continuous, 3420 integer (3420 binary)
Found heuristic solution: objective 55.0000000

Root relaxation: objective 2.000000e+00, 2554 iterations, 0.08 seconds

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

     0     0    2.00000    0  116   55.00000    2.00000  96.4%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
     0     0    2.66667    0  529    5.00000    2.66667  46.7%     -    1s
H    0     0                       4.0000000    2.66667  33.3%     -    1s
     0     0    2.66667    0 2757    4.00000    2.66667  33.3%     -    1s
     0     0    2.66667    0  127    4.00000    2.66667  33.3%     -    4s
     0     0    2.67066    0 2474    4.00000    2.67066  33.2%     -    7s
     0     0    2.67066    0 2693    4.00000    2.67066  33.2%     -    8s
     0     0    2.67066    0 2711    4.00000    2.67066  33.2%     -   10s
     0     0    2.67066    0 2333    4.00000    2.67066  33.2%     -   12s
     0     0    2.67066    0 2388    4.00000    2.67066  33.2%     -   14s
     0     0    2.67066    0 2517    4.00000    2.67066  33.2%     -   16s
     0     0    2.67066    0 2538    4.00000    2.67066  33.2%     -   17s
     0     0    2.67066    0 2538    4.00000    2.67066  33.2%     -   18s
     0     2    2.80000    0 2538    4.00000    2.80000  30.0%     -   26s

Cutting planes:
  Clique: 50
  Zero half: 10

Explored 17 nodes (87599 simplex iterations) in 28.81 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%