Gurobi 5.0.1 (linux64) logging started Thu Dec 20 12:32:21 2012

Optimize a model with 6722 rows, 6561 columns and 39356 nonzeros
Presolve removed 3951 rows and 4203 columns
Presolve time: 0.12s
Presolved: 2771 rows, 2358 columns, 14131 nonzeros
Variable types: 72 continuous, 2286 integer (2286 binary)

Root relaxation: objective 5.953053e+02, 344 iterations, 0.01 seconds

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

     0     0  595.30531    0   83          -  595.30531     -      -    0s
     0     0  607.99913    0   79          -  607.99913     -      -    0s
     0     0  609.52381    0   49          -  609.52381     -      -    0s
     0     0  609.69385    0   49          -  609.69385     -      -    0s
     0     0  609.82903    0   48          -  609.82903     -      -    0s
     0     0  609.96767    0   58          -  609.96767     -      -    0s
     0     0  610.28515    0   68          -  610.28515     -      -    0s
     0     0  610.29357    0   69          -  610.29357     -      -    0s
     0     0  610.29357    0   64          -  610.29357     -      -    0s
     0     0  610.29357    0   66          -  610.29357     -      -    0s
     0     0  610.29357    0   66          -  610.29357     -      -    0s
     0     2  610.29357    0   66          -  610.29357     -      -    1s
*   21    20              17     621.0000000  610.97423  1.61%  13.8    1s
H   27    12                     615.0000000  611.97815  0.49%  13.0    1s

Cutting planes:
  Learned: 5
  Gomory: 6
  Cover: 24
  Implied bound: 3
  Clique: 2
  MIR: 21
  GUB cover: 18
  Zero half: 5
  Mod-K: 1

Explored 46 nodes (1204 simplex iterations) in 1.20 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.150000000000e+02, best bound 6.150000000000e+02, gap 0.0%