Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:21:56 2012 Optimize a model with 20293 rows, 5402 columns and 65917 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.70s Presolved: 20364 rows, 5400 columns, 70690 nonzeros Variable types: 0 continuous, 5400 integer (5400 binary) Found heuristic solution: objective 73.0000000 Root relaxation: objective 2.000000e+00, 3915 iterations, 0.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 146 73.00000 2.00000 97.3% - 1s H 0 0 64.0000000 2.00000 96.9% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 209 5.00000 2.66667 46.7% - 12s 0 0 2.66981 0 5023 5.00000 2.66981 46.6% - 12s 0 0 2.66981 0 5005 5.00000 2.66981 46.6% - 15s 0 0 2.66981 0 5000 5.00000 2.66981 46.6% - 16s 0 0 2.66981 0 5020 5.00000 2.66981 46.6% - 17s 0 0 2.66981 0 4564 5.00000 2.66981 46.6% - 20s 0 0 2.66981 0 4464 5.00000 2.66981 46.6% - 22s 0 0 2.66981 0 4470 5.00000 2.66981 46.6% - 23s 0 0 2.66981 0 4450 5.00000 2.66981 46.6% - 25s 0 0 2.66981 0 4446 5.00000 2.66981 46.6% - 26s 0 0 2.66981 0 4461 5.00000 2.66981 46.6% - 27s 0 0 2.66981 0 4439 5.00000 2.66981 46.6% - 29s 0 0 2.66981 0 4508 5.00000 2.66981 46.6% - 31s 0 0 2.66981 0 4509 5.00000 2.66981 46.6% - 32s 0 0 2.66981 0 4509 5.00000 2.66981 46.6% - 33s 0 2 2.80000 0 4509 5.00000 2.80000 44.0% - 90s * 38 2 13 4.0000000 4.00000 0.0% 279 94s Cutting planes: Clique: 165 Zero half: 18 Explored 39 nodes (75362 simplex iterations) in 94.18 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%