Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:16 2012 Optimize a model with 535 rows, 47 columns and 1070 nonzeros Presolve removed 361 rows and 0 columns Presolve time: 0.01s Presolved: 174 rows, 47 columns, 941 nonzeros Variable types: 0 continuous, 47 integer (47 binary) Found heuristic solution: objective 4.0000000 Root relaxation: objective 9.105849e+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 9.10585 0 43 4.00000 9.10585 128% - 0s H 0 0 6.0000000 9.10585 51.8% - 0s 0 0 8.72522 0 42 6.00000 8.72522 45.4% - 0s H 0 0 7.0000000 8.72522 24.6% - 0s 0 0 8.58656 0 43 7.00000 8.58656 22.7% - 0s 0 0 8.55044 0 41 7.00000 8.55044 22.1% - 0s 0 0 8.52019 0 44 7.00000 8.52019 21.7% - 0s 0 0 8.47742 0 44 7.00000 8.47742 21.1% - 0s 0 0 8.46766 0 45 7.00000 8.46766 21.0% - 0s 0 0 8.46647 0 45 7.00000 8.46647 20.9% - 0s 0 2 8.46226 0 45 7.00000 8.46226 20.9% - 0s Cutting planes: Clique: 24 Zero half: 6 Explored 7 nodes (405 simplex iterations) in 0.06 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.000000000000e+00, best bound 7.000000000000e+00, gap 0.0%