Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:35:50 2012 Optimize a model with 14755 rows, 4692 columns and 48618 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.48s Presolved: 14753 rows, 4690 columns, 48184 nonzeros Variable types: 0 continuous, 4690 integer (4690 binary) Found heuristic solution: objective 68.0000000 Root relaxation: objective 2.000000e+00, 3435 iterations, 0.13 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 62.0000000 2.00000 96.8% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 175 5.00000 2.66667 46.7% - 3s 0 0 2.67005 0 4155 5.00000 2.67005 46.6% - 4s 0 0 2.67005 0 4147 5.00000 2.67005 46.6% - 6s 0 0 2.67005 0 4145 5.00000 2.67005 46.6% - 7s 0 0 2.67005 0 4143 5.00000 2.67005 46.6% - 7s 0 0 2.67005 0 4143 5.00000 2.67005 46.6% - 8s 0 0 2.67005 0 3818 5.00000 2.67005 46.6% - 12s 0 0 2.67005 0 3745 5.00000 2.67005 46.6% - 17s 0 0 2.67005 0 3785 5.00000 2.67005 46.6% - 21s 0 0 2.67005 0 3869 5.00000 2.67005 46.6% - 24s 0 0 2.67005 0 3819 5.00000 2.67005 46.6% - 28s 0 0 2.67005 0 3858 5.00000 2.67005 46.6% - 32s 0 0 2.67005 0 3735 5.00000 2.67005 46.6% - 36s 0 0 2.67005 0 3862 5.00000 2.67005 46.6% - 39s 0 0 2.67005 0 3862 5.00000 2.67005 46.6% - 41s 0 2 2.80000 0 3862 5.00000 2.80000 44.0% - 56s H 27 4 4.0000000 3.00000 25.0% 624 60s Cutting planes: Clique: 85 Zero half: 9 Explored 32 nodes (116780 simplex iterations) in 63.18 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%