Gurobi 5.0.1 (linux64) logging started Mon Feb  4 16:27:04 2013

Optimize a model with 1120 rows, 22330 columns and 1034066 nonzeros
Presolve removed 23 rows and 133 columns
Presolve time: 2.36s
Presolved: 1097 rows, 22197 columns, 1027457 nonzeros
Variable types: 0 continuous, 22197 integer (22197 binary)
Found heuristic solution: objective 14557.000000
Found heuristic solution: objective 12466.000000

Root relaxation: objective 7.979467e+03, 6183 iterations, 2.55 seconds

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

     0     0 7979.46667    0   72 12466.0000 7979.46667  36.0%     -    5s
H    0     0                    8322.0000000 7979.46667  4.12%     -    6s
H    0     0                    8158.0000000 7979.46667  2.19%     -    6s
     0     0 7989.00000    0   36 8158.00000 7989.00000  2.07%     -    8s
H    0     0                    8146.0000000 7989.00000  1.93%     -   10s
     0     0 7989.00000    0   36 8146.00000 7989.00000  1.93%     -   13s
     0     0 7994.00000    0   40 8146.00000 7994.00000  1.87%     -   14s
     0     0 7995.50000    0   38 8146.00000 7995.50000  1.85%     -   15s
H    0     0                    8136.0000000 7995.50000  1.73%     -   15s
*    0     0               0    7997.0000000 7997.00000   0.0%     -   15s

Cutting planes:
  Clique: 4
  Zero half: 5

Explored 0 nodes (13033 simplex iterations) in 15.80 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.997000000000e+03, best bound 7.997000000000e+03, gap 0.0%