Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:28:13 2012 Optimize a model with 6578 rows, 2652 columns and 22132 nonzeros Presolve removed 1787 rows and 2 columns Presolve time: 0.16s Presolved: 4842 rows, 2650 columns, 20465 nonzeros Variable types: 0 continuous, 2650 integer (2650 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 3.000000e+00, 5259 iterations, 0.81 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 62 51.00000 3.00000 94.1% - 3s H 0 0 47.0000000 3.00000 93.6% - 3s H 0 0 20.0000000 3.00000 85.0% - 3s H 0 0 5.0000000 3.00000 40.0% - 3s 0 0 3.00000 0 66 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 68 4.00000 3.00000 25.0% - 5s 0 0 infeasible 0 4.00000 3.00001 25.0% - 5s Cutting planes: Zero half: 17 Explored 0 nodes (29617 simplex iterations) in 5.46 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%