Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:43 2012 Optimize a model with 516 rows, 142 columns and 1032 nonzeros Presolve removed 106 rows and 3 columns Presolve time: 0.00s Presolved: 410 rows, 139 columns, 877 nonzeros Variable types: 0 continuous, 139 integer (139 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 6.000000e+01, 189 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 0 112 44.00000 60.00000 36.4% - 0s 0 0 58.50000 0 109 44.00000 58.50000 33.0% - 0s 0 0 57.66848 0 134 44.00000 57.66848 31.1% - 0s H 0 0 46.0000000 57.66848 25.4% - 0s H 0 0 47.0000000 57.66848 22.7% - 0s 0 0 56.68903 0 134 47.00000 56.68903 20.6% - 0s 0 0 56.18658 0 135 47.00000 56.18658 19.5% - 0s 0 0 55.72398 0 136 47.00000 55.72398 18.6% - 0s H 0 0 48.0000000 55.72398 16.1% - 0s H 0 0 49.0000000 55.72398 13.7% - 0s 0 0 55.58627 0 136 49.00000 55.58627 13.4% - 0s 0 0 55.42596 0 136 49.00000 55.42596 13.1% - 0s 0 0 55.24223 0 137 49.00000 55.24223 12.7% - 0s 0 0 55.09642 0 137 49.00000 55.09642 12.4% - 0s 0 0 55.04823 0 137 49.00000 55.04823 12.3% - 0s 0 0 55.04823 0 136 49.00000 55.04823 12.3% - 0s 0 2 55.04106 0 136 49.00000 55.04106 12.3% - 0s * 79 29 8 50.0000000 54.32590 8.65% 38.6 0s Cutting planes: Gomory: 1 Zero half: 140 Explored 679 nodes (19445 simplex iterations) in 0.73 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%