Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:31 2013

Optimize a model with 4320 rows, 12060 columns and 36100 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.16s
Presolved: 4300 rows, 12040 columns, 32080 nonzeros
Variable types: 8040 continuous, 4000 integer (4000 binary)

Root relaxation: objective 4.370285e+04, 645 iterations, 0.02 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     -      -    0s
     0     0 43727.1996    0    2          - 43727.1996     -      -    0s
     0     0 43727.1996    0    2          - 43727.1996     -      -    0s
     0     0 43727.5401    0    2          - 43727.5401     -      -    0s
     0     0 43728.1242    0    2          - 43728.1242     -      -    0s
     0     0 43728.1242    0    2          - 43728.1242     -      -    0s
     0     2 43728.1242    0    2          - 43728.1242     -      -    1s
*   28    20              14    44223.998117 43852.1529  0.84%  18.7    1s
*   48    15              11    44051.546581 43878.1255  0.39%  15.0    1s
*   68     7              12    43900.867770 43896.9453  0.01%  12.1    1s

Cutting planes:
  Gomory: 3
  Implied bound: 22
  Flow cover: 3

Explored 69 nodes (1984 simplex iterations) in 1.59 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.390086776983e+04, best bound 4.389694531587e+04, gap 0.0089%