Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:55:56 2012 Optimize a model with 11592 rows, 4032 columns and 38556 nonzeros Presolve time: 0.10s Presolved: 11592 rows, 4032 columns, 38863 nonzeros Variable types: 0 continuous, 4032 integer (4032 binary) Found heuristic solution: objective 36.0000000 Root relaxation: objective 2.000000e+00, 3586 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 126 36.00000 2.00000 94.4% - 0s H 0 0 11.0000000 2.00000 81.8% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.00000 0 126 5.00000 2.00000 60.0% - 1s 0 0 2.00000 0 126 5.00000 2.00000 60.0% - 6s H 0 0 4.0000000 2.00000 50.0% - 6s 0 0 2.00000 0 126 4.00000 2.00000 50.0% - 11s 0 0 2.00000 0 126 4.00000 2.00000 50.0% - 16s 0 0 2.00000 0 126 4.00000 2.00000 50.0% - 21s 0 0 2.00000 0 126 4.00000 2.00000 50.0% - 26s 0 2 2.00000 0 126 4.00000 2.00000 50.0% - 47s 1 3 3.00000 1 756 4.00000 2.00000 50.0% 41320 58s 2 4 3.00000 1 648 4.00000 3.00000 25.0% 27870 64s 3 5 3.00000 2 207 4.00000 3.00000 25.0% 19600 65s 26 4 cutoff 7 4.00000 3.00000 25.0% 2982 70s 36 2 cutoff 4 4.00000 3.00000 25.0% 2952 76s 56 2 3.00000 5 122 4.00000 3.00000 25.0% 2208 80s Cutting planes: Clique: 182 Zero half: 2 Explored 61 nodes (199294 simplex iterations) in 80.15 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%