Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:52 2012 Optimize a model with 490 rows, 134 columns and 980 nonzeros Presolve removed 107 rows and 4 columns Presolve time: 0.00s Presolved: 383 rows, 130 columns, 826 nonzeros Variable types: 0 continuous, 130 integer (130 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 5.550000e+01, 227 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.50000 0 97 45.00000 55.50000 23.3% - 0s 0 0 54.76190 0 127 45.00000 54.76190 21.7% - 0s H 0 0 46.0000000 54.76190 19.0% - 0s 0 0 54.14286 0 125 46.00000 54.14286 17.7% - 0s 0 0 53.78420 0 128 46.00000 53.78420 16.9% - 0s 0 0 53.42473 0 128 46.00000 53.42473 16.1% - 0s 0 0 53.24580 0 128 46.00000 53.24580 15.8% - 0s 0 0 53.05783 0 129 46.00000 53.05783 15.3% - 0s 0 0 52.93353 0 129 46.00000 52.93353 15.1% - 0s 0 0 52.57325 0 126 46.00000 52.57325 14.3% - 0s 0 0 52.43801 0 128 46.00000 52.43801 14.0% - 0s 0 0 52.30226 0 127 46.00000 52.30226 13.7% - 0s 0 0 52.15395 0 129 46.00000 52.15395 13.4% - 0s H 0 0 47.0000000 52.15395 11.0% - 0s 0 0 52.13477 0 127 47.00000 52.13477 10.9% - 0s 0 0 52.13238 0 129 47.00000 52.13238 10.9% - 0s 0 0 52.13238 0 128 47.00000 52.13238 10.9% - 0s H 0 0 48.0000000 52.13238 8.61% - 0s 0 2 52.13212 0 128 48.00000 52.13212 8.61% - 0s Cutting planes: Zero half: 125 Explored 135 nodes (6206 simplex iterations) in 0.28 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.800000000000e+01, best bound 4.800000000000e+01, gap 0.0%