Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:31:08 2012 Optimize a model with 9453 rows, 3422 columns and 31492 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.22s Presolved: 9509 rows, 3420 columns, 34530 nonzeros Variable types: 0 continuous, 3420 integer (3420 binary) Found heuristic solution: objective 57.0000000 Root relaxation: objective 2.000000e+00, 2502 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 0 116 57.00000 2.00000 96.5% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 2511 5.00000 2.66667 46.7% - 1s 0 0 2.67066 0 2805 5.00000 2.67066 46.6% - 2s 0 0 2.67066 0 2789 5.00000 2.67066 46.6% - 2s 0 0 2.67066 0 2775 5.00000 2.67066 46.6% - 3s 0 0 2.67066 0 2760 5.00000 2.67066 46.6% - 4s 0 0 2.67066 0 2765 5.00000 2.67066 46.6% - 5s 0 0 2.67066 0 2236 5.00000 2.67066 46.6% - 7s 0 0 2.67066 0 2267 5.00000 2.67066 46.6% - 9s 0 0 2.67066 0 2223 5.00000 2.67066 46.6% - 10s 0 0 2.67066 0 2357 5.00000 2.67066 46.6% - 12s 0 0 2.67066 0 2351 5.00000 2.67066 46.6% - 14s 0 0 2.67066 0 2325 5.00000 2.67066 46.6% - 16s 0 0 2.67066 0 2411 5.00000 2.67066 46.6% - 18s 0 0 2.67066 0 2492 5.00000 2.67066 46.6% - 20s 0 0 2.67066 0 2492 5.00000 2.67066 46.6% - 21s 0 2 2.80000 0 2492 5.00000 2.80000 44.0% - 26s H 27 4 4.0000000 3.00000 25.0% 409 28s Cutting planes: Clique: 57 Zero half: 15 Explored 32 nodes (84796 simplex iterations) in 29.12 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%