Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:26:59 2012 Optimize a model with 21899 rows, 5700 columns and 71023 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.75s Presolved: 21897 rows, 5698 columns, 70439 nonzeros Variable types: 0 continuous, 5698 integer (5698 binary) Found heuristic solution: objective 75.0000000 Root relaxation: objective 2.000000e+00, 4008 iterations, 0.17 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 150 75.00000 2.00000 97.3% - 1s H 0 0 69.0000000 2.00000 97.1% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 209 5.00000 2.66667 46.7% - 14s 0 0 2.66972 0 5293 5.00000 2.66972 46.6% - 15s 0 0 2.66972 0 5286 5.00000 2.66972 46.6% - 18s 0 0 2.66972 0 5280 5.00000 2.66972 46.6% - 19s 0 0 2.66972 0 5284 5.00000 2.66972 46.6% - 19s 0 0 2.66972 0 4966 5.00000 2.66972 46.6% - 22s 0 0 2.66972 0 4879 5.00000 2.66972 46.6% - 24s 0 0 2.66972 0 4954 5.00000 2.66972 46.6% - 25s 0 0 2.66972 0 5001 5.00000 2.66972 46.6% - 27s 0 0 2.66972 0 5001 5.00000 2.66972 46.6% - 29s 0 0 2.66972 0 5000 5.00000 2.66972 46.6% - 30s 0 0 2.66972 0 5002 5.00000 2.66972 46.6% - 32s 0 0 2.66972 0 5002 5.00000 2.66972 46.6% - 32s 0 2 2.66972 0 5002 5.00000 2.66972 46.6% - 140s * 292 3 23 4.0000000 4.00000 0.0% 95.5 144s Cutting planes: Clique: 187 Zero half: 16 Explored 293 nodes (82583 simplex iterations) in 144.63 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%