Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:38:05 2012 Optimize a model with 6915 rows, 2756 columns and 23242 nonzeros Presolve removed 1875 rows and 54 columns Presolve time: 0.18s Presolved: 5040 rows, 2702 columns, 18628 nonzeros Variable types: 0 continuous, 2702 integer (2702 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 5221 iterations, 0.79 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 165 52.00000 3.00000 94.2% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 131 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 136 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 129 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 116 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 113 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 133 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 20s 0 2 3.00000 0 118 4.00000 3.00000 25.0% - 25s 4 4 3.00000 1 162 4.00000 3.00000 25.0% 2463 32s 5 5 3.00000 1 80 4.00000 3.00000 25.0% 1971 35s Cutting planes: Gomory: 22 Clique: 1 Zero half: 77 Explored 6 nodes (143458 simplex iterations) in 38.44 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%