Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:56:59 2012 Optimize a model with 8791 rows, 3192 columns and 29286 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.19s Presolved: 8845 rows, 3190 columns, 32108 nonzeros Variable types: 0 continuous, 3190 integer (3190 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 2.000000e+00, 2165 iterations, 0.06 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 112 56.00000 2.00000 96.4% - 0s H 0 0 53.0000000 2.00000 96.2% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 336 5.00000 2.66667 46.7% - 1s 0 0 2.68790 0 2570 5.00000 2.68790 46.2% - 1s 0 0 2.68790 0 2533 5.00000 2.68790 46.2% - 2s H 0 0 4.0000000 2.68790 32.8% - 2s 0 0 2.68790 0 2500 4.00000 2.68790 32.8% - 2s 0 0 2.68790 0 2510 4.00000 2.68790 32.8% - 3s 0 0 2.68790 0 2220 4.00000 2.68790 32.8% - 5s 0 0 2.68790 0 2314 4.00000 2.68790 32.8% - 6s 0 0 2.68790 0 2280 4.00000 2.68790 32.8% - 7s 0 0 2.68790 0 2186 4.00000 2.68790 32.8% - 9s 0 0 2.68790 0 2209 4.00000 2.68790 32.8% - 9s 0 0 2.68790 0 2220 4.00000 2.68790 32.8% - 11s 0 0 2.68790 0 2220 4.00000 2.68790 32.8% - 11s 0 1 3.00000 0 2220 4.00000 3.00000 25.0% - 13s Cutting planes: Clique: 136 Zero half: 8 Explored 12 nodes (42318 simplex iterations) in 14.60 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%