Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:34:50 2012 Optimize a model with 8524 rows, 3080 columns and 28378 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.18s Presolved: 8522 rows, 3078 columns, 28068 nonzeros Variable types: 0 continuous, 3078 integer (3078 binary) Found heuristic solution: objective 55.0000000 Root relaxation: objective 2.000000e+00, 2390 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 110 55.00000 2.00000 96.4% - 0s H 0 0 50.0000000 2.00000 96.0% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 250 5.00000 2.66667 46.7% - 1s 0 0 2.67949 0 2706 5.00000 2.67949 46.4% - 1s 0 0 2.67949 0 2710 5.00000 2.67949 46.4% - 2s 0 0 2.67949 0 2352 5.00000 2.67949 46.4% - 4s 0 0 2.67949 0 2181 5.00000 2.67949 46.4% - 5s 0 0 2.67949 0 2175 5.00000 2.67949 46.4% - 6s 0 0 2.67949 0 2127 5.00000 2.67949 46.4% - 7s H 0 0 4.0000000 2.67949 33.0% - 9s 0 0 2.67949 0 2220 4.00000 2.67949 33.0% - 10s 0 0 2.67949 0 2245 4.00000 2.67949 33.0% - 11s 0 0 2.67949 0 2232 4.00000 2.67949 33.0% - 12s 0 0 2.67949 0 2268 4.00000 2.67949 33.0% - 13s 0 0 2.67949 0 2268 4.00000 2.67949 33.0% - 14s 0 1 3.00000 0 2268 4.00000 3.00000 25.0% - 16s Cutting planes: Clique: 109 Zero half: 4 Explored 10 nodes (48546 simplex iterations) in 16.94 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%