Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:22:50 2012 Optimize a model with 10674 rows, 3782 columns and 35500 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.27s Presolved: 10672 rows, 3780 columns, 35150 nonzeros Variable types: 0 continuous, 3780 integer (3780 binary) Found heuristic solution: objective 61.0000000 Root relaxation: objective 2.000000e+00, 2678 iterations, 0.08 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 122 61.00000 2.00000 96.7% - 0s H 0 0 55.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 3440 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 3441 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 145 5.00000 2.66667 46.7% - 5s 0 0 2.67045 0 3137 5.00000 2.67045 46.6% - 7s 0 0 2.67045 0 3169 5.00000 2.67045 46.6% - 8s 0 0 2.67045 0 2996 5.00000 2.67045 46.6% - 9s 0 0 2.67045 0 3037 5.00000 2.67045 46.6% - 10s 0 0 2.67045 0 3035 5.00000 2.67045 46.6% - 12s 0 0 2.67045 0 3030 5.00000 2.67045 46.6% - 13s 0 0 2.67045 0 3016 5.00000 2.67045 46.6% - 15s H 0 0 4.0000000 2.67045 33.2% - 16s 0 0 2.67045 0 2867 4.00000 2.67045 33.2% - 18s 0 0 2.67045 0 2862 4.00000 2.67045 33.2% - 19s 0 0 2.67045 0 3025 4.00000 2.67045 33.2% - 20s 0 0 2.67045 0 2965 4.00000 2.67045 33.2% - 21s 0 0 2.67045 0 3006 4.00000 2.67045 33.2% - 22s 0 0 2.67045 0 2904 4.00000 2.67045 33.2% - 24s 0 0 2.67045 0 2847 4.00000 2.67045 33.2% - 26s 0 0 2.67045 0 2986 4.00000 2.67045 33.2% - 27s 0 0 2.67045 0 2986 4.00000 2.67045 33.2% - 28s 0 2 2.80000 0 2986 4.00000 2.80000 30.0% - 33s 10 0 cutoff 1 4.00000 4.00000 0.0% 1448 36s Cutting planes: Clique: 66 Zero half: 9 Explored 11 nodes (97476 simplex iterations) in 36.03 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%