Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:18:44 2013

Optimize a model with 49770 rows, 49070 columns and 196070 nonzeros
Presolve removed 3971 rows and 0 columns
Presolve time: 0.29s
Presolved: 45799 rows, 49070 columns, 188128 nonzeros
Variable types: 49000 continuous, 70 integer (70 binary)

Root relaxation: objective 8.891786e+04, 12194 iterations, 2.17 seconds

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

     0     0 88917.8641    0    2          - 88917.8641     -      -    2s
H    0     0                    89865.000000 88917.8641  1.05%     -    2s
H    0     0                    89440.000000 88917.8641  0.58%     -    2s
     0     0 88955.6039    0    3 89440.0000 88955.6039  0.54%     -    3s
     0     0 88955.7700    0    4 89440.0000 88955.7700  0.54%     -    3s
     0     0 88955.7700    0    4 89440.0000 88955.7700  0.54%     -    3s
     0     0 88955.7700    0    2 89440.0000 88955.7700  0.54%     -    6s
     0     0 88955.7700    0    4 89440.0000 88955.7700  0.54%     -    6s
     0     0 88955.7700    0    4 89440.0000 88955.7700  0.54%     -    6s
     0     0 88955.7700    0    4 89440.0000 88955.7700  0.54%     -    7s
     0     2 89081.6463    0    4 89440.0000 89081.6463  0.40%     -    8s
H    7     3                    89319.926829 89181.2903  0.16%  84.9    8s
*    8     2               8    89269.000000 89181.2903  0.10%  91.9    8s

Cutting planes:
  Gomory: 1
  Flow cover: 8

Explored 11 nodes (18516 simplex iterations) in 8.71 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.926900000000e+04, best bound 8.926900000000e+04, gap 0.0%