Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:34:27 2012 Optimize a model with 15911 rows, 4692 columns and 52086 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.52s Presolved: 15909 rows, 4690 columns, 51618 nonzeros Variable types: 0 continuous, 4690 integer (4690 binary) Found heuristic solution: objective 68.0000000 Root relaxation: objective 2.000000e+00, 3512 iterations, 0.14 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 136 68.00000 2.00000 97.1% - 0s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 260 5.00000 2.66667 46.7% - 6s 0 0 2.67347 0 4210 5.00000 2.67347 46.5% - 7s 0 0 2.67347 0 4224 5.00000 2.67347 46.5% - 8s 0 0 2.67347 0 3938 5.00000 2.67347 46.5% - 11s 0 0 2.67347 0 3738 5.00000 2.67347 46.5% - 13s 0 0 2.67347 0 3824 5.00000 2.67347 46.5% - 15s 0 0 2.67347 0 3816 5.00000 2.67347 46.5% - 16s 0 0 2.67347 0 3799 5.00000 2.67347 46.5% - 18s 0 0 2.67347 0 3819 5.00000 2.67347 46.5% - 20s 0 0 2.67347 0 3802 5.00000 2.67347 46.5% - 23s 0 0 2.67347 0 3829 5.00000 2.67347 46.5% - 24s 0 0 2.67347 0 3813 5.00000 2.67347 46.5% - 27s 0 0 2.67347 0 3813 5.00000 2.67347 46.5% - 28s 0 0 2.67347 0 3807 5.00000 2.67347 46.5% - 30s 0 2 3.00000 0 3807 5.00000 3.00000 40.0% - 38s 4 6 3.14286 3 209 5.00000 3.00000 40.0% 2304 40s H 28 1 4.0000000 3.00000 25.0% 404 41s Cutting planes: Clique: 113 Zero half: 21 Explored 32 nodes (92517 simplex iterations) in 41.55 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%