Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:35:14 2012 Optimize a model with 549 rows, 149 columns and 1098 nonzeros Presolve removed 122 rows and 2 columns Presolve time: 0.00s Presolved: 427 rows, 147 columns, 929 nonzeros Variable types: 0 continuous, 147 integer (147 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 6.225000e+01, 271 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 62.25000 0 122 45.00000 62.25000 38.3% - 0s H 0 0 49.0000000 62.25000 27.0% - 0s 0 0 61.57895 0 145 49.00000 61.57895 25.7% - 0s 0 0 60.52778 0 145 49.00000 60.52778 23.5% - 0s H 0 0 51.0000000 60.52778 18.7% - 0s 0 0 60.08287 0 145 51.00000 60.08287 17.8% - 0s H 0 0 52.0000000 60.08287 15.5% - 0s 0 0 59.67045 0 147 52.00000 59.67045 14.8% - 0s 0 0 59.36216 0 144 52.00000 59.36216 14.2% - 0s 0 0 59.03385 0 144 52.00000 59.03385 13.5% - 0s 0 0 58.90150 0 146 52.00000 58.90150 13.3% - 0s 0 0 58.77082 0 147 52.00000 58.77082 13.0% - 0s H 0 0 53.0000000 58.77082 10.9% - 0s 0 0 58.71158 0 147 53.00000 58.71158 10.8% - 0s 0 0 58.62602 0 147 53.00000 58.62602 10.6% - 0s 0 0 58.59100 0 147 53.00000 58.59100 10.5% - 0s 0 0 58.59100 0 143 53.00000 58.59100 10.5% - 0s 0 2 58.58028 0 143 53.00000 58.58028 10.5% - 0s * 9 9 6 55.0000000 58.36207 6.11% 63.6 0s Cutting planes: Zero half: 99 Explored 108 nodes (5373 simplex iterations) in 0.28 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%