Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:41 2012 Optimize a model with 584 rows, 147 columns and 1168 nonzeros Presolve removed 135 rows and 0 columns Presolve time: 0.00s Presolved: 449 rows, 147 columns, 991 nonzeros Variable types: 0 continuous, 147 integer (147 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 5.882143e+01, 290 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.82143 0 143 41.00000 58.82143 43.5% - 0s H 0 0 44.0000000 58.82143 33.7% - 0s H 0 0 45.0000000 58.82143 30.7% - 0s 0 0 57.97727 0 144 45.00000 57.97727 28.8% - 0s H 0 0 46.0000000 57.97727 26.0% - 0s H 0 0 48.0000000 57.97727 20.8% - 0s 0 0 57.25433 0 143 48.00000 57.25433 19.3% - 0s 0 0 56.94631 0 143 48.00000 56.94631 18.6% - 0s 0 0 56.59769 0 146 48.00000 56.59769 17.9% - 0s 0 0 56.44355 0 147 48.00000 56.44355 17.6% - 0s 0 0 56.14227 0 146 48.00000 56.14227 17.0% - 0s 0 0 55.87843 0 146 48.00000 55.87843 16.4% - 0s 0 0 55.73391 0 146 48.00000 55.73391 16.1% - 0s 0 0 55.68361 0 146 48.00000 55.68361 16.0% - 0s H 0 0 50.0000000 55.68361 11.4% - 0s 0 0 55.66115 0 147 50.00000 55.66115 11.3% - 0s 0 0 55.66115 0 147 50.00000 55.66115 11.3% - 0s 0 2 55.66025 0 147 50.00000 55.66025 11.3% - 0s * 178 34 12 51.0000000 54.43243 6.73% 35.4 0s Cutting planes: Zero half: 113 Explored 429 nodes (14777 simplex iterations) in 0.63 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%