Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:06:33 2012 Optimize a model with 6076 rows, 2450 columns and 20482 nonzeros Presolve removed 1520 rows and 49 columns Presolve time: 0.13s Presolved: 4556 rows, 2401 columns, 16954 nonzeros Variable types: 0 continuous, 2401 integer (2401 binary) Found heuristic solution: objective 35.0000000 Root relaxation: objective 3.000000e+00, 4427 iterations, 0.40 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 98 35.00000 3.00000 91.4% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 189 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 72 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 50 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 76 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 98 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 148 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 141 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 133 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 142 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 94 4.00000 3.00000 25.0% - 19s 0 2 3.00000 0 94 4.00000 3.00000 25.0% - 20s 6 6 3.00000 1 103 4.00000 3.00000 25.0% 321 26s 9 8 3.00000 1 88 4.00000 3.00000 25.0% 214 31s 12 10 3.00000 1 102 4.00000 3.00000 25.0% 160 38s 15 12 infeasible 11 4.00000 3.00000 25.0% 6161 41s Cutting planes: Gomory: 6 Zero half: 2 Explored 17 nodes (208014 simplex iterations) in 41.50 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%