Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:54:14 2012 Optimize a model with 8231 rows, 3192 columns and 27606 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.18s Presolved: 8285 rows, 3190 columns, 30448 nonzeros Variable types: 0 continuous, 3190 integer (3190 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 2.000000e+00, 2315 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 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 338 4.00000 2.66667 33.3% - 1s 0 0 2.68790 0 2666 4.00000 2.68790 32.8% - 1s 0 0 2.68790 0 2641 4.00000 2.68790 32.8% - 2s 0 0 2.68790 0 2660 4.00000 2.68790 32.8% - 2s 0 0 2.68790 0 2295 4.00000 2.68790 32.8% - 7s 0 0 2.68790 0 2208 4.00000 2.68790 32.8% - 8s 0 0 2.68790 0 2253 4.00000 2.68790 32.8% - 10s 0 0 2.68790 0 2252 4.00000 2.68790 32.8% - 12s 0 0 2.68790 0 2249 4.00000 2.68790 32.8% - 15s 0 0 2.68790 0 2258 4.00000 2.68790 32.8% - 17s 0 0 2.68790 0 2255 4.00000 2.68790 32.8% - 19s 0 0 2.68790 0 2232 4.00000 2.68790 32.8% - 21s 0 0 2.68790 0 2232 4.00000 2.68790 32.8% - 24s 0 0 2.68790 0 2241 4.00000 2.68790 32.8% - 26s 0 0 2.68790 0 2241 4.00000 2.68790 32.8% - 27s 0 1 3.00000 0 2241 4.00000 3.00000 25.0% - 35s Cutting planes: Clique: 99 Zero half: 3 Explored 8 nodes (109778 simplex iterations) in 36.25 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%