Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:39:23 2012 Optimize a model with 6187 rows, 2756 columns and 21058 nonzeros Presolve removed 1043 rows and 54 columns Presolve time: 0.16s Presolved: 5144 rows, 2702 columns, 18416 nonzeros Variable types: 0 continuous, 2702 integer (2702 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4279 iterations, 0.49 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 60 52.00000 3.00000 94.2% - 3s H 0 0 8.0000000 3.00000 62.5% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 259 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 129 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 88 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 123 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 19s 0 2 3.00000 0 94 4.00000 3.00000 25.0% - 20s 4 4 3.00000 1 56 4.00000 3.00000 25.0% 420 25s 7 6 3.00000 1 120 4.00000 3.00000 25.0% 240 31s 8 7 3.00000 1 62 4.00000 3.00000 25.0% 210 36s 10 8 3.00000 1 76 4.00000 3.00000 25.0% 168 41s 11 9 3.00000 1 1053 4.00000 3.00000 25.0% 153 71s 14 11 infeasible 14 4.00000 3.00000 25.0% 7711 75s Cutting planes: Gomory: 6 Zero half: 24 Explored 17 nodes (215832 simplex iterations) in 79.32 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%