Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:49 2012 Optimize a model with 440 rows, 133 columns and 880 nonzeros Presolve removed 71 rows and 2 columns Presolve time: 0.00s Presolved: 369 rows, 131 columns, 775 nonzeros Variable types: 0 continuous, 131 integer (131 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 5.750000e+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 57.50000 0 97 44.00000 57.50000 30.7% - 0s 0 0 56.56452 0 125 44.00000 56.56452 28.6% - 0s H 0 0 46.0000000 56.56452 23.0% - 0s H 0 0 48.0000000 56.56452 17.8% - 0s 0 0 56.08824 0 128 48.00000 56.08824 16.9% - 0s 0 0 55.51282 0 130 48.00000 55.51282 15.7% - 0s 0 0 55.14430 0 129 48.00000 55.14430 14.9% - 0s 0 0 54.78870 0 130 48.00000 54.78870 14.1% - 0s 0 0 54.64315 0 129 48.00000 54.64315 13.8% - 0s 0 0 54.24074 0 130 48.00000 54.24074 13.0% - 0s 0 0 54.07659 0 129 48.00000 54.07659 12.7% - 0s 0 0 53.98304 0 127 48.00000 53.98304 12.5% - 0s 0 0 53.94680 0 130 48.00000 53.94680 12.4% - 0s 0 0 53.94680 0 125 48.00000 53.94680 12.4% - 0s H 0 0 49.0000000 53.94680 10.1% - 0s H 0 0 50.0000000 53.94680 7.89% - 0s 0 2 53.93864 0 125 50.00000 53.93864 7.88% - 0s H 80 8 51.0000000 53.26230 4.44% 34.9 0s Cutting planes: Gomory: 2 Zero half: 83 Explored 101 nodes (4392 simplex iterations) in 0.19 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%