Gurobi 5.0.1 (linux64) logging started Fri Nov 16 09:51:21 2012 Optimize a model with 15276 rows, 4556 columns and 50116 nonzeros Presolve time: 0.12s Presolved: 15276 rows, 4556 columns, 50326 nonzeros Variable types: 0 continuous, 4556 integer (4556 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 2.000000e+00, 4299 iterations, 0.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 134 44.00000 2.00000 95.5% - 0s H 0 0 15.0000000 2.00000 86.7% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.00000 0 134 5.00000 2.00000 60.0% - 3s 0 0 2.00000 0 134 5.00000 2.00000 60.0% - 11s 0 0 2.00000 0 134 5.00000 2.00000 60.0% - 18s 0 0 2.00000 0 134 5.00000 2.00000 60.0% - 27s 0 0 2.00000 0 134 5.00000 2.00000 60.0% - 35s 0 0 2.00000 0 134 5.00000 2.00000 60.0% - 41s 0 2 2.00000 0 134 5.00000 2.00000 60.0% - 58s 1 3 2.62500 1 418 5.00000 2.00000 60.0% 50623 71s 2 4 2.50000 1 564 5.00000 2.50000 50.0% 41927 82s 11 11 4.00000 9 122 5.00000 2.50000 50.0% 8563 85s * 31 9 21 4.0000000 2.50000 37.5% 3570 88s 34 10 3.00000 3 106 4.00000 2.50000 37.5% 3410 90s 61 9 2.70000 3 245 4.00000 2.66667 33.3% 2215 95s Cutting planes: Clique: 106 Explored 87 nodes (239510 simplex iterations) in 96.34 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%