Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:26:25 2013

Optimize a model with 63279 rows, 62489 columns and 249719 nonzeros
Presolve removed 2006 rows and 0 columns
Presolve time: 0.40s
Presolved: 61273 rows, 62489 columns, 245707 nonzeros
Variable types: 62410 continuous, 79 integer (79 binary)

Root relaxation: objective 8.871752e+04, 13139 iterations, 2.97 seconds

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

     0     0 88717.5241    0    4          - 88717.5241     -      -    3s
H    0     0                    90594.000000 88717.5241  2.07%     -    3s
     0     0 88719.5596    0    5 90594.0000 88719.5596  2.07%     -    4s
     0     0 88720.1080    0    5 90594.0000 88720.1080  2.07%     -    4s
     0     0 88720.1876    0    5 90594.0000 88720.1876  2.07%     -    5s
H    0     0                    89956.718182 88720.1876  1.37%     -    6s
H    0     0                    89793.181818 88720.1876  1.19%     -    6s
H    0     0                    89405.000000 88720.1876  0.77%     -    6s
     0     2 88723.4495    0    5 89405.0000 88723.4495  0.76%     -    7s
H    8     7                    88920.000000 88805.0177  0.13%   144    8s
H   11     9                    88903.622222 88805.0177  0.11%   120    8s
*   12     8               9    88889.000000 88805.0177  0.09%   124    8s

Cutting planes:
  Gomory: 1
  Flow cover: 4

Explored 21 nodes (15293 simplex iterations) in 8.96 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.888900000000e+04, best bound 8.888900000000e+04, gap 0.0%