Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:19:45 2012 Optimize a model with 7721 rows, 2970 columns and 25864 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.15s Presolved: 7773 rows, 2968 columns, 28494 nonzeros Variable types: 0 continuous, 2968 integer (2968 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 2.000000e+00, 2284 iterations, 0.06 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 108 54.00000 2.00000 96.3% - 0s H 0 0 51.0000000 2.00000 96.1% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 2099 5.00000 2.66667 46.7% - 1s 0 0 2.67097 0 2449 5.00000 2.67097 46.6% - 1s 0 0 2.67097 0 2428 5.00000 2.67097 46.6% - 2s 0 0 2.67097 0 2430 5.00000 2.67097 46.6% - 2s 0 0 2.67097 0 2266 5.00000 2.67097 46.6% - 3s 0 0 2.67097 0 2108 5.00000 2.67097 46.6% - 5s 0 0 2.67097 0 2137 5.00000 2.67097 46.6% - 6s 0 0 2.67097 0 2104 5.00000 2.67097 46.6% - 8s 0 0 2.67097 0 2148 5.00000 2.67097 46.6% - 9s 0 0 2.67097 0 2169 5.00000 2.67097 46.6% - 10s 0 0 2.67097 0 2043 5.00000 2.67097 46.6% - 12s 0 0 2.67097 0 2094 5.00000 2.67097 46.6% - 13s 0 0 2.67097 0 2094 5.00000 2.67097 46.6% - 14s 0 2 3.00000 0 2094 5.00000 3.00000 40.0% - 18s * 15 5 4 4.0000000 4.00000 0.0% 620 19s Cutting planes: Clique: 42 Zero half: 4 Explored 16 nodes (65170 simplex iterations) in 19.37 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%