Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:45:36 2013

Optimize a model with 55574 rows, 54834 columns and 219114 nonzeros
Presolve removed 4792 rows and 0 columns
Presolve time: 0.34s
Presolved: 50782 rows, 54834 columns, 209530 nonzeros
Variable types: 54760 continuous, 74 integer (74 binary)

Root relaxation: objective 8.931976e+04, 11388 iterations, 2.11 seconds

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

     0     0 89319.7631    0    4          - 89319.7631     -      -    2s
H    0     0                    90300.000000 89319.7631  1.09%     -    2s
H    0     0                    90133.000000 89319.7631  0.90%     -    2s
H    0     0                    89443.000000 89319.7631  0.14%     -    3s
     0     0 89320.6198    0    5 89443.0000 89320.6198  0.14%     -    3s
     0     0 89320.6198    0    4 89443.0000 89320.6198  0.14%     -    4s
     0     0 89320.6375    0    5 89443.0000 89320.6375  0.14%     -    5s
     0     2 89321.9519    0    5 89443.0000 89321.9519  0.14%     -    6s
H    1     1                    89429.000000 89321.9519  0.12%   0.0    6s
H    2     2                    89353.909091 89347.8889  0.01%  59.5    6s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 2 nodes (15565 simplex iterations) in 6.44 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.935390909091e+04, best bound 8.934788888889e+04, gap 0.0067%