Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:35:13 2012 Optimize a model with 564 rows, 149 columns and 1128 nonzeros Presolve removed 136 rows and 2 columns Presolve time: 0.00s Presolved: 428 rows, 147 columns, 938 nonzeros Variable types: 0 continuous, 147 integer (147 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.025000e+01, 297 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.25000 0 120 50.00000 60.25000 20.5% - 0s 0 0 60.00000 0 116 50.00000 60.00000 20.0% - 0s 0 0 59.69767 0 142 50.00000 59.69767 19.4% - 0s 0 0 58.39130 0 137 50.00000 58.39130 16.8% - 0s 0 0 57.73438 0 144 50.00000 57.73438 15.5% - 0s 0 0 57.46166 0 142 50.00000 57.46166 14.9% - 0s 0 0 57.15126 0 143 50.00000 57.15126 14.3% - 0s 0 0 57.07937 0 145 50.00000 57.07937 14.2% - 0s H 0 0 51.0000000 57.07937 11.9% - 0s 0 0 57.05882 0 144 51.00000 57.05882 11.9% - 0s 0 0 56.91837 0 144 51.00000 56.91837 11.6% - 0s 0 0 56.81428 0 144 51.00000 56.81428 11.4% - 0s 0 0 56.72749 0 144 51.00000 56.72749 11.2% - 0s 0 0 56.59706 0 144 51.00000 56.59706 11.0% - 0s 0 0 56.58446 0 145 51.00000 56.58446 10.9% - 0s 0 0 56.58446 0 145 51.00000 56.58446 10.9% - 0s 0 2 56.55526 0 145 51.00000 56.55526 10.9% - 0s * 44 12 8 53.0000000 56.26114 6.15% 40.3 0s Cutting planes: Zero half: 132 Explored 158 nodes (7569 simplex iterations) in 0.34 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%