Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:16:27 2012 Optimize a model with 6750 rows, 2550 columns and 22600 nonzeros Presolve removed 1650 rows and 0 columns Presolve time: 0.15s Presolved: 5100 rows, 2550 columns, 18900 nonzeros Variable types: 0 continuous, 2550 integer (2550 binary) Found heuristic solution: objective 34.0000000 Root relaxation: objective 3.000000e+00, 5298 iterations, 0.70 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 64 34.00000 3.00000 91.2% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 135 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 153 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 157 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 157 4.00000 3.00000 25.0% - 17s 0 2 3.00000 0 139 4.00000 3.00000 25.0% - 22s 4 4 3.00000 1 116 4.00000 3.00000 25.0% 2803 25s 6 6 3.00000 1 154 4.00000 3.00000 25.0% 1869 30s 8 7 3.00000 1 154 4.00000 3.00000 25.0% 1402 36s 10 8 3.00000 1 139 4.00000 3.00000 25.0% 1121 42s 11 9 3.00000 1 108 4.00000 3.00000 25.0% 1019 45s 13 10 3.00000 1 159 4.00000 3.00000 25.0% 863 51s 14 11 3.00000 1 167 4.00000 3.00000 25.0% 801 56s 18 13 3.00000 12 217 4.00000 3.00000 25.0% 8825 63s Cutting planes: Gomory: 7 Zero half: 4 Explored 20 nodes (261270 simplex iterations) in 63.97 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%