Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:15:34 2012 Optimize a model with 6850 rows, 2550 columns and 22900 nonzeros Presolve removed 2600 rows and 0 columns Presolve time: 0.15s Presolved: 4250 rows, 2550 columns, 16900 nonzeros Variable types: 0 continuous, 2550 integer (2550 binary) Found heuristic solution: objective 30.0000000 Root relaxation: objective 3.000000e+00, 5515 iterations, 0.76 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 113 30.00000 3.00000 90.0% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s 0 0 3.00000 0 183 5.00000 3.00000 40.0% - 2s 0 0 3.00000 0 161 5.00000 3.00000 40.0% - 3s 0 0 3.00000 0 162 5.00000 3.00000 40.0% - 6s H 0 0 4.0000000 3.00000 25.0% - 6s 0 0 3.00000 0 129 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 151 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 107 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 105 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 170 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 163 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 167 4.00000 3.00000 25.0% - 22s 0 0 3.00000 0 167 4.00000 3.00000 25.0% - 23s 0 2 3.00000 0 167 4.00000 3.00000 25.0% - 25s 5 5 3.00000 1 114 4.00000 3.00000 25.0% 496 31s 6 6 3.00000 1 142 4.00000 3.00000 25.0% 413 35s 9 8 3.00000 1 107 4.00000 3.00000 25.0% 275 42s 10 8 3.00000 1 113 4.00000 3.00000 25.0% 248 48s 13 10 infeasible 14 4.00000 3.00000 25.0% 7385 52s Cutting planes: Gomory: 5 Zero half: 2 Explored 15 nodes (207301 simplex iterations) in 52.97 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%