Gurobi 5.0.1 (linux64) logging started Thu Dec 20 12:13:17 2012

Optimize a model with 6562 rows, 6561 columns and 29375 nonzeros
Presolve removed 5952 rows and 3743 columns
Presolve time: 0.08s
Presolved: 610 rows, 2818 columns, 7391 nonzeros
Variable types: 73 continuous, 2745 integer (2745 binary)

Root relaxation: objective 5.924839e+02, 337 iterations, 0.00 seconds

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

     0     0  592.48393    0   65          -  592.48393     -      -    0s
     0     0  620.05407    0   68          -  620.05407     -      -    0s
     0     0  626.63475    0   67          -  626.63475     -      -    0s
     0     0  628.66372    0   73          -  628.66372     -      -    0s
     0     0  630.71429    0   71          -  630.71429     -      -    0s
     0     0  636.46570    0   69          -  636.46570     -      -    0s
     0     0  637.51429    0   74          -  637.51429     -      -    0s
     0     0  638.50366    0   79          -  638.50366     -      -    0s
     0     0  638.68615    0   75          -  638.68615     -      -    0s
     0     0  638.78571    0   75          -  638.78571     -      -    0s
     0     0  638.95238    0   65          -  638.95238     -      -    0s
     0     0  638.95238    0   65          -  638.95238     -      -    0s
     0     2  638.95238    0   65          -  638.95238     -      -    0s
   614   311  658.43586   21   44          -  656.00017     -   10.7    5s
*  897   287              46     667.0000000  658.84796  1.22%  13.3    7s

Cutting planes:
  Learned: 2
  Gomory: 18
  Cover: 22
  Implied bound: 27
  Clique: 6
  MIR: 34
  GUB cover: 9
  Zero half: 22

Explored 1082 nodes (14461 simplex iterations) in 7.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.670000000000e+02, best bound 6.670000000000e+02, gap 0.0%