Gurobi 5.0.1 (linux64) logging started Thu Dec 20 12:45:25 2012

Optimize a model with 6562 rows, 6561 columns and 29566 nonzeros
Presolve removed 5602 rows and 3615 columns
Presolve time: 0.09s
Presolved: 960 rows, 2946 columns, 9710 nonzeros
Variable types: 74 continuous, 2872 integer (2872 binary)

Root relaxation: objective 5.690802e+02, 294 iterations, 0.00 seconds

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

     0     0  569.08019    0   92          -  569.08019     -      -    0s
     0     0  586.42138    0  135          -  586.42138     -      -    0s
     0     0  588.65275    0  137          -  588.65275     -      -    0s
     0     0  589.79431    0  121          -  589.79431     -      -    0s
     0     0  589.92285    0  117          -  589.92285     -      -    0s
     0     0  590.08075    0  124          -  590.08075     -      -    0s
     0     0  590.08075    0  112          -  590.08075     -      -    0s
     0     2  590.08075    0  111          -  590.08075     -      -    0s
   610   521  600.98024   16   88          -  600.98024     -   13.2    5s
H  610   494                     646.0000000  601.24855  6.93%  13.2    5s
H  617   475                     612.0000000  601.66667  1.69%  16.1    7s
H  625   456                     611.0000000  601.66667  1.53%  15.8    7s
H  629   435                     608.0000000  601.66667  1.04%  15.7    8s
H  629   413                     604.0000000  601.66667  0.39%  15.7    8s

Cutting planes:
  Gomory: 10
  Cover: 3
  Clique: 3
  MIR: 6
  Zero half: 11

Explored 640 nodes (12173 simplex iterations) in 8.14 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.040000000000e+02, best bound 6.040000000000e+02, gap 0.0%