Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:01:05 2012 Optimize a model with 18203 rows, 5550 columns and 59790 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.66s Presolved: 18201 rows, 5548 columns, 59298 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 4070 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 0 148 74.00000 2.00000 97.3% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 195 5.00000 2.66667 46.7% - 12s 0 0 2.66977 0 5042 5.00000 2.66977 46.6% - 12s 0 0 2.66977 0 5017 5.00000 2.66977 46.6% - 14s 0 0 2.66977 0 4975 5.00000 2.66977 46.6% - 15s 0 0 2.66977 0 4954 5.00000 2.66977 46.6% - 16s 0 0 2.66977 0 4953 5.00000 2.66977 46.6% - 16s 0 0 2.66977 0 4953 5.00000 2.66977 46.6% - 17s 0 0 2.66977 0 4584 5.00000 2.66977 46.6% - 19s 0 0 2.66977 0 4615 5.00000 2.66977 46.6% - 20s 0 0 2.66977 0 4598 5.00000 2.66977 46.6% - 23s 0 0 2.66977 0 4590 5.00000 2.66977 46.6% - 24s 0 0 2.66977 0 4663 5.00000 2.66977 46.6% - 26s 0 0 2.66977 0 4662 5.00000 2.66977 46.6% - 27s 0 0 2.66977 0 4584 5.00000 2.66977 46.6% - 28s 0 0 2.66977 0 4602 5.00000 2.66977 46.6% - 30s 0 0 2.66977 0 4612 5.00000 2.66977 46.6% - 32s 0 0 2.66977 0 4612 5.00000 2.66977 46.6% - 33s 0 2 2.80000 0 4612 5.00000 2.80000 44.0% - 50s * 37 5 23 4.0000000 3.00000 25.0% 281 53s Cutting planes: Clique: 108 Zero half: 14 Explored 45 nodes (86430 simplex iterations) in 54.45 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%