Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:44:12 2012 Optimize a model with 6915 rows, 2756 columns and 23242 nonzeros Presolve removed 1874 rows and 2 columns Presolve time: 0.17s Presolved: 5093 rows, 2754 columns, 21384 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 5385 iterations, 0.86 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 505 52.00000 3.00000 94.2% - 2s H 0 0 43.0000000 3.00000 93.0% - 2s H 0 0 9.0000000 3.00000 66.7% - 2s H 0 0 8.0000000 3.00000 62.5% - 2s 0 0 3.00000 0 134 8.00000 3.00000 62.5% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 134 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 131 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 112 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 109 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 107 4.00000 3.00000 25.0% - 22s 0 0 3.00000 0 111 4.00000 3.00000 25.0% - 25s 0 0 3.00000 0 111 4.00000 3.00000 25.0% - 25s 0 2 3.00000 0 111 4.00000 3.00000 25.0% - 27s 4 4 3.00000 1 664 4.00000 3.00000 25.0% 768 33s 5 5 3.00000 1 118 4.00000 3.00000 25.0% 614 36s 7 6 3.00000 1 125 4.00000 3.00000 25.0% 439 41s Cutting planes: Gomory: 13 Clique: 2 Zero half: 63 Explored 8 nodes (178684 simplex iterations) in 44.02 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%