Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:20:22 2012 Optimize a model with 6899 rows, 2550 columns and 22998 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.13s Presolved: 6897 rows, 2548 columns, 22722 nonzeros Variable types: 0 continuous, 2548 integer (2548 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 2.000000e+00, 1994 iterations, 0.05 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 100 50.00000 2.00000 96.0% - 0s H 0 0 43.0000000 2.00000 95.3% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 124 4.00000 2.66667 33.3% - 0s 0 0 2.67133 0 2333 4.00000 2.67133 33.2% - 0s 0 0 2.67133 0 2333 4.00000 2.67133 33.2% - 1s 0 0 2.67133 0 2239 4.00000 2.67133 33.2% - 2s 0 0 2.67133 0 2241 4.00000 2.67133 33.2% - 2s 0 0 2.67133 0 2245 4.00000 2.67133 33.2% - 3s 0 0 2.67133 0 2228 4.00000 2.67133 33.2% - 4s 0 0 2.67133 0 2225 4.00000 2.67133 33.2% - 5s 0 0 2.67133 0 2225 4.00000 2.67133 33.2% - 5s 0 0 2.67133 0 2225 4.00000 2.67133 33.2% - 6s 0 2 3.00000 0 2225 4.00000 3.00000 25.0% - 7s Cutting planes: Clique: 85 Explored 5 nodes (17627 simplex iterations) in 7.96 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%