Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:08:24 2012 Optimize a model with 15731 rows, 4830 columns and 51679 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.51s Presolved: 15798 rows, 4828 columns, 55984 nonzeros Variable types: 0 continuous, 4828 integer (4828 binary) Found heuristic solution: objective 69.0000000 Root relaxation: objective 2.000000e+00, 3276 iterations, 0.12 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 138 69.00000 2.00000 97.1% - 0s H 0 0 65.0000000 2.00000 96.9% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 196 5.00000 2.66667 46.7% - 6s H 0 0 4.0000000 2.66667 33.3% - 6s 0 0 2.67000 0 4272 4.00000 2.67000 33.2% - 6s 0 0 2.67000 0 4245 4.00000 2.67000 33.2% - 8s 0 0 2.67000 0 4250 4.00000 2.67000 33.2% - 9s 0 0 2.67000 0 3936 4.00000 2.67000 33.2% - 12s 0 0 2.67000 0 3872 4.00000 2.67000 33.2% - 14s 0 0 2.67000 0 3880 4.00000 2.67000 33.2% - 16s 0 0 2.67000 0 3854 4.00000 2.67000 33.2% - 18s 0 0 2.67000 0 3837 4.00000 2.67000 33.2% - 19s 0 0 2.67000 0 3921 4.00000 2.67000 33.2% - 21s 0 0 2.67000 0 3970 4.00000 2.67000 33.2% - 24s 0 0 2.67000 0 3956 4.00000 2.67000 33.2% - 26s 0 0 2.67000 0 3941 4.00000 2.67000 33.2% - 28s 0 0 2.67000 0 3940 4.00000 2.67000 33.2% - 30s 0 0 2.67000 0 3941 4.00000 2.67000 33.2% - 32s 0 0 2.67000 0 3941 4.00000 2.67000 33.2% - 33s 0 2 2.80000 0 3941 4.00000 2.80000 30.0% - 42s Cutting planes: Clique: 108 Zero half: 9 Explored 7 nodes (95584 simplex iterations) in 44.64 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%