Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:38:09 2012 Optimize a model with 637 rows, 154 columns and 1274 nonzeros Presolve removed 159 rows and 0 columns Presolve time: 0.00s Presolved: 478 rows, 154 columns, 1067 nonzeros Variable types: 0 continuous, 154 integer (154 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 6.000000e+01, 291 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.00000 0 110 45.00000 60.00000 33.3% - 0s H 0 0 46.0000000 60.00000 30.4% - 0s 0 0 59.49673 0 146 46.00000 59.49673 29.3% - 0s H 0 0 48.0000000 59.49673 24.0% - 0s 0 0 58.54762 0 149 48.00000 58.54762 22.0% - 0s 0 0 58.10264 0 149 48.00000 58.10264 21.0% - 0s 0 0 57.89340 0 147 48.00000 57.89340 20.6% - 0s H 0 0 49.0000000 57.89340 18.1% - 0s 0 0 57.67288 0 152 49.00000 57.67288 17.7% - 0s 0 0 57.60177 0 150 49.00000 57.60177 17.6% - 0s 0 0 57.53103 0 151 49.00000 57.53103 17.4% - 0s H 0 0 51.0000000 57.53103 12.8% - 0s 0 0 57.48236 0 148 51.00000 57.48236 12.7% - 0s 0 0 57.40743 0 151 51.00000 57.40743 12.6% - 0s 0 0 57.36744 0 150 51.00000 57.36744 12.5% - 0s 0 0 57.34756 0 151 51.00000 57.34756 12.4% - 0s 0 0 57.34756 0 150 51.00000 57.34756 12.4% - 0s 0 2 57.34531 0 150 51.00000 57.34531 12.4% - 0s * 11 11 8 52.0000000 57.07407 9.76% 68.6 0s Cutting planes: Zero half: 103 Explored 686 nodes (24588 simplex iterations) in 0.93 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%