Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:17 2012 Optimize a model with 553 rows, 48 columns and 1106 nonzeros Presolve removed 383 rows and 0 columns Presolve time: 0.01s Presolved: 170 rows, 48 columns, 948 nonzeros Variable types: 0 continuous, 48 integer (48 binary) Found heuristic solution: objective 6.0000000 Root relaxation: objective 9.226190e+00, 86 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 9.22619 0 37 6.00000 9.22619 53.8% - 0s H 0 0 7.0000000 9.22619 31.8% - 0s 0 0 8.86565 0 42 7.00000 8.86565 26.7% - 0s H 0 0 8.0000000 8.86565 10.8% - 0s Cutting planes: Clique: 10 Zero half: 2 Explored 0 nodes (133 simplex iterations) in 0.02 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%