Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:12:56 2012 Optimize a model with 18203 rows, 5550 columns and 59790 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.65s Presolved: 18275 rows, 5548 columns, 64774 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 3916 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 3373 5.00000 2.66667 46.7% - 10s 0 0 2.66667 0 3781 5.00000 2.66667 46.7% - 11s 0 0 2.66667 0 197 5.00000 2.66667 46.7% - 14s 0 0 2.66977 0 4751 5.00000 2.66977 46.6% - 16s 0 0 2.66977 0 4743 5.00000 2.66977 46.6% - 18s 0 0 2.66977 0 4746 5.00000 2.66977 46.6% - 18s 0 0 2.66977 0 4591 5.00000 2.66977 46.6% - 20s 0 0 2.66977 0 4519 5.00000 2.66977 46.6% - 21s 0 0 2.66977 0 4591 5.00000 2.66977 46.6% - 22s 0 0 2.66977 0 4591 5.00000 2.66977 46.6% - 24s 0 0 2.66977 0 4613 5.00000 2.66977 46.6% - 26s 0 0 2.66977 0 4569 5.00000 2.66977 46.6% - 28s 0 0 2.66977 0 4599 5.00000 2.66977 46.6% - 29s 0 0 2.66977 0 4599 5.00000 2.66977 46.6% - 30s 0 2 2.80000 0 4599 5.00000 2.80000 44.0% - 44s 14 2 4.00000 2 120 5.00000 4.00000 20.0% 438 45s * 33 4 18 4.0000000 4.00000 0.0% 266 46s Cutting planes: Clique: 123 Zero half: 9 Explored 34 nodes (72855 simplex iterations) in 46.95 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%