Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:17 2012 Optimize a model with 615 rows, 50 columns and 1230 nonzeros Presolve removed 441 rows and 0 columns Presolve time: 0.01s Presolved: 174 rows, 50 columns, 992 nonzeros Variable types: 0 continuous, 50 integer (50 binary) Found heuristic solution: objective 5.0000000 Root relaxation: objective 9.081608e+00, 103 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 9.08161 0 40 5.00000 9.08161 81.6% - 0s H 0 0 6.0000000 9.08161 51.4% - 0s 0 0 8.80191 0 44 6.00000 8.80191 46.7% - 0s 0 0 8.73569 0 46 6.00000 8.73569 45.6% - 0s H 0 0 7.0000000 8.73569 24.8% - 0s 0 0 8.69603 0 45 7.00000 8.69603 24.2% - 0s 0 0 8.69096 0 48 7.00000 8.69096 24.2% - 0s H 0 0 8.0000000 8.69096 8.64% - 0s Cutting planes: Gomory: 2 Clique: 17 Zero half: 5 Explored 0 nodes (219 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%