Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:11:13 2012 Optimize a model with 6173 rows, 2450 columns and 20725 nonzeros Presolve removed 1815 rows and 2 columns Presolve time: 0.15s Presolved: 4358 rows, 2448 columns, 16333 nonzeros Variable types: 0 continuous, 2448 integer (2448 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 3.000000e+00, 4364 iterations, 0.63 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 92 48.00000 3.00000 93.8% - 2s H 0 0 35.0000000 3.00000 91.4% - 2s H 0 0 6.0000000 3.00000 50.0% - 2s 0 0 3.00000 0 113 6.00000 3.00000 50.0% - 3s H 0 0 5.0000000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 109 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 165 4.00000 3.00000 25.0% - 8s 0 0 infeasible 0 4.00000 3.00001 25.0% - 9s Cutting planes: Gomory: 1 Zero half: 37 Explored 0 nodes (49009 simplex iterations) in 9.04 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%