Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:42:28 2012 Optimize a model with 9439 rows, 3540 columns and 31563 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.22s Presolved: 9437 rows, 3538 columns, 31243 nonzeros Variable types: 0 continuous, 3538 integer (3538 binary) Found heuristic solution: objective 59.0000000 Root relaxation: objective 2.000000e+00, 2743 iterations, 0.08 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 118 59.00000 2.00000 96.6% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 366 5.00000 2.66667 46.7% - 1s H 0 0 4.0000000 2.66667 33.3% - 2s 0 0 2.68675 0 2858 4.00000 2.68675 32.8% - 2s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 76 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 153 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 129 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 116 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 131 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 124 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 108 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 126 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 126 4.00000 3.00000 25.0% - 3s 0 2 3.00000 0 126 4.00000 3.00000 25.0% - 3s Cutting planes: Zero half: 16 Explored 3 nodes (20836 simplex iterations) in 3.24 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%