Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:21:22 2012 Optimize a model with 6899 rows, 2550 columns and 22998 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.12s Presolved: 6947 rows, 2548 columns, 25222 nonzeros Variable types: 0 continuous, 2548 integer (2548 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 2.000000e+00, 1913 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 49.0000000 2.00000 95.9% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 2301 4.00000 2.66667 33.3% - 0s 0 0 2.66667 0 1323 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 2298 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 126 4.00000 2.66667 33.3% - 2s 0 0 2.67133 0 2272 4.00000 2.67133 33.2% - 3s 0 0 2.67133 0 2327 4.00000 2.67133 33.2% - 3s 0 0 2.67133 0 2191 4.00000 2.67133 33.2% - 4s 0 0 2.67133 0 2205 4.00000 2.67133 33.2% - 5s 0 0 2.67133 0 2198 4.00000 2.67133 33.2% - 5s 0 0 2.67133 0 2200 4.00000 2.67133 33.2% - 6s 0 0 2.67133 0 2230 4.00000 2.67133 33.2% - 7s 0 0 2.67133 0 2252 4.00000 2.67133 33.2% - 7s 0 0 2.67133 0 2252 4.00000 2.67133 33.2% - 8s 0 2 3.00000 0 2252 4.00000 3.00000 25.0% - 9s Cutting planes: Clique: 79 Zero half: 3 Explored 9 nodes (27472 simplex iterations) in 9.93 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%