Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:45:46 2013

Optimize a model with 20320 rows, 44060 columns and 148100 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.40s
Presolved: 20300 rows, 44040 columns, 128080 nonzeros
Variable types: 24040 continuous, 20000 integer (20000 binary)

Root relaxation: objective 4.370285e+04, 739 iterations, 0.05 seconds

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

     0     0 43702.8549    0    4          - 43702.8549     -      -    2s
     0     0 43729.3284    0    2          - 43729.3284     -      -    2s
     0     0 43731.3893    0    2          - 43731.3893     -      -    2s
     0     0 43731.3893    0    2          - 43731.3893     -      -    3s
     0     2 43731.3893    0    2          - 43731.3893     -      -    5s
*   31    19              16    44224.151094 43852.1529  0.84%  19.5    6s
*   56    16              13    44051.546979 43878.1255  0.39%  13.7    6s
*   81     8              14    43900.868905 43896.9453  0.01%  11.6    7s

Cutting planes:
  Gomory: 3
  Implied bound: 19
  Flow cover: 3

Explored 82 nodes (2017 simplex iterations) in 7.21 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.390086890462e+04, best bound 4.389694531587e+04, gap 0.0089%