Gurobi 5.0.1 (linux64) logging started Wed Apr 24 04:01:53 2013

Optimize a model with 68224 rows, 67404 columns and 269124 nonzeros
Presolve removed 82 rows and 0 columns
Presolve time: 0.31s
Presolved: 68142 rows, 67404 columns, 269042 nonzeros
Variable types: 67322 continuous, 82 integer (82 binary)

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    7387    6.8461926e+04   2.869048e+04   0.000000e+00      5s
    8447    6.8763900e+04   0.000000e+00   0.000000e+00      7s

Root relaxation: objective 6.876390e+04, 8447 iterations, 7.04 seconds

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

     0     0 68763.9005    0   57          - 68763.9005     -      -    7s
H    0     0                    107690.00000 68763.9005  36.1%     -   11s
H    0     0                    93554.000000 68763.9005  26.5%     -   46s
     0     0 82288.6249    0   20 93554.0000 82288.6249  12.0%     -   58s
     0     0 88898.8569    0   10 93554.0000 88898.8569  4.98%     -   63s
     0     0 89934.6084    0    7 93554.0000 89934.6084  3.87%     -   64s
     0     0 90263.0056    0    3 93554.0000 90263.0056  3.52%     -   65s
H    0     0                    92343.921743 90263.0056  2.25%     -   65s
H    0     0                    91737.000000 90263.0056  1.61%     -   65s
     0     2 90266.0792    0    3 91737.0000 90266.0792  1.60%     -   66s
H    3     3                    90510.234043 90321.0233  0.21%  69.3   66s
H    6     3                    90406.492063 90333.8435  0.08%   147   67s
*    8     2               6    90375.000000 90333.8435  0.05%   141   67s

Cutting planes:
  Implied bound: 79

Explored 11 nodes (21935 simplex iterations) in 67.95 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 9.037500000000e+04, best bound 9.037500000000e+04, gap 0.0%