Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:06 2012 Optimize a model with 456 rows, 136 columns and 912 nonzeros Presolve removed 67 rows and 0 columns Presolve time: 0.00s Presolved: 389 rows, 136 columns, 820 nonzeros Variable types: 0 continuous, 136 integer (136 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 5.850000e+01, 211 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.50000 0 117 45.00000 58.50000 30.0% - 0s H 0 0 46.0000000 58.50000 27.2% - 0s 0 0 57.50000 0 111 46.00000 57.50000 25.0% - 0s 0 0 57.00000 0 133 46.00000 57.00000 23.9% - 0s 0 0 56.63636 0 132 46.00000 56.63636 23.1% - 0s H 0 0 47.0000000 56.63636 20.5% - 0s 0 0 55.66873 0 133 47.00000 55.66873 18.4% - 0s 0 0 55.24473 0 132 47.00000 55.24473 17.5% - 0s H 0 0 48.0000000 55.24473 15.1% - 0s 0 0 55.03636 0 132 48.00000 55.03636 14.7% - 0s 0 0 54.89050 0 135 48.00000 54.89050 14.4% - 0s 0 0 54.73087 0 134 48.00000 54.73087 14.0% - 0s 0 0 54.71377 0 135 48.00000 54.71377 14.0% - 0s 0 0 54.71377 0 135 48.00000 54.71377 14.0% - 0s H 0 0 49.0000000 54.71377 11.7% - 0s 0 2 54.70796 0 135 49.00000 54.70796 11.6% - 0s * 9 9 6 51.0000000 54.69967 7.25% 47.3 0s Cutting planes: Zero half: 119 Explored 108 nodes (4979 simplex iterations) in 0.23 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%