Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:58:17 2012 Optimize a model with 21163 rows, 5550 columns and 68670 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.73s Presolved: 21161 rows, 5548 columns, 68098 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 3895 iterations, 0.17 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 73.0000000 2.00000 97.3% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 838 5.00000 2.66667 46.7% - 15s 0 0 2.66667 0 3609 5.00000 2.66667 46.7% - 15s 0 0 2.66667 0 208 5.00000 2.66667 46.7% - 19s 0 0 2.66977 0 4850 5.00000 2.66977 46.6% - 22s 0 0 2.66977 0 4828 5.00000 2.66977 46.6% - 24s 0 0 2.66977 0 4827 5.00000 2.66977 46.6% - 25s 0 0 2.66977 0 4825 5.00000 2.66977 46.6% - 26s 0 0 2.66977 0 4823 5.00000 2.66977 46.6% - 26s 0 0 2.66977 0 4818 5.00000 2.66977 46.6% - 27s 0 0 2.66977 0 4819 5.00000 2.66977 46.6% - 28s 0 0 2.66977 0 4821 5.00000 2.66977 46.6% - 29s 0 0 2.66977 0 4821 5.00000 2.66977 46.6% - 31s 0 0 2.66977 0 4809 5.00000 2.66977 46.6% - 33s 0 0 2.66977 0 4857 5.00000 2.66977 46.6% - 33s 0 0 2.66977 0 4857 5.00000 2.66977 46.6% - 35s 0 0 2.66977 0 4857 5.00000 2.66977 46.6% - 36s 0 2 2.66977 0 4857 5.00000 2.66977 46.6% - 62s 7 3 4.00000 2 140 5.00000 3.00000 40.0% 930 65s * 286 1 23 4.0000000 4.00000 0.0% 95.8 69s Cutting planes: Clique: 172 Zero half: 7 Explored 287 nodes (87107 simplex iterations) in 69.10 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%