Gurobi 5.0.1 (linux64) logging started Mon Feb  4 16:26:48 2013

Optimize a model with 1022 rows, 20269 columns and 842427 nonzeros
Presolve removed 13 rows and 30 columns
Presolve time: 2.72s
Presolved: 1009 rows, 20239 columns, 840928 nonzeros
Variable types: 0 continuous, 20239 integer (20239 binary)
Found heuristic solution: objective 9783.0000000

Root relaxation: objective 6.577000e+03, 4992 iterations, 1.63 seconds

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

     0     0 6577.00000    0   40 9783.00000 6577.00000  32.8%     -    4s
H    0     0                    7171.0000000 6577.00000  8.28%     -    4s
H    0     0                    6856.0000000 6577.00000  4.07%     -    5s
     0     0 6589.50000    0   36 6856.00000 6589.50000  3.89%     -    6s
H    0     0                    6854.0000000 6589.50000  3.86%     -   10s
     0     0 6589.50000    0   36 6854.00000 6589.50000  3.86%     -   12s
H    0     0                    6650.0000000 6589.50000  0.91%     -   12s
*    0     0               0    6591.0000000 6591.00000   0.0%     -   12s

Cutting planes:
  Zero half: 1

Explored 0 nodes (10141 simplex iterations) in 12.90 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.591000000000e+03, best bound 6.591000000000e+03, gap 0.0%