Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:25 2012 Optimize a model with 792 rows, 57 columns and 1584 nonzeros Presolve removed 540 rows and 0 columns Presolve time: 0.01s Presolved: 252 rows, 57 columns, 1454 nonzeros Variable types: 0 continuous, 57 integer (57 binary) Found heuristic solution: objective 6.0000000 Root relaxation: objective 9.969381e+00, 146 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 9.96938 0 51 6.00000 9.96938 66.2% - 0s H 0 0 7.0000000 9.96938 42.4% - 0s 0 0 9.67704 0 55 7.00000 9.67704 38.2% - 0s 0 0 9.62851 0 55 7.00000 9.62851 37.6% - 0s 0 0 9.58146 0 54 7.00000 9.58146 36.9% - 0s 0 0 9.56915 0 53 7.00000 9.56915 36.7% - 0s 0 0 9.55334 0 56 7.00000 9.55334 36.5% - 0s 0 0 9.55028 0 56 7.00000 9.55028 36.4% - 0s 0 2 9.54784 0 56 7.00000 9.54784 36.4% - 0s * 20 4 4 8.0000000 9.35987 17.0% 33.1 0s Cutting planes: Clique: 18 Zero half: 10 Explored 25 nodes (1062 simplex iterations) in 0.12 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%