Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:59:26 2012 Optimize a model with 20645 rows, 5550 columns and 67116 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.72s Presolved: 20643 rows, 5548 columns, 66558 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 3915 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 0 148 74.00000 2.00000 97.3% - 1s H 0 0 71.0000000 2.00000 97.2% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 214 5.00000 2.66667 46.7% - 10s 0 0 2.66977 0 4917 5.00000 2.66977 46.6% - 11s 0 0 2.66977 0 4904 5.00000 2.66977 46.6% - 14s 0 0 2.66977 0 4887 5.00000 2.66977 46.6% - 14s 0 0 2.66977 0 4884 5.00000 2.66977 46.6% - 15s 0 0 2.66977 0 4899 5.00000 2.66977 46.6% - 16s 0 0 2.66977 0 4430 5.00000 2.66977 46.6% - 18s 0 0 2.66977 0 4322 5.00000 2.66977 46.6% - 20s 0 0 2.66977 0 4329 5.00000 2.66977 46.6% - 22s 0 0 2.66977 0 4381 5.00000 2.66977 46.6% - 23s 0 0 2.66977 0 4292 5.00000 2.66977 46.6% - 25s 0 0 2.66977 0 4335 5.00000 2.66977 46.6% - 27s 0 0 2.66977 0 4317 5.00000 2.66977 46.6% - 28s 0 0 2.66977 0 4298 5.00000 2.66977 46.6% - 30s 0 0 2.66977 0 4362 5.00000 2.66977 46.6% - 32s 0 0 2.66977 0 4362 5.00000 2.66977 46.6% - 33s 0 2 2.80000 0 4362 5.00000 2.80000 44.0% - 93s 27 25 4.00000 22 44 5.00000 3.00000 40.0% 314 96s * 41 2 22 4.0000000 4.00000 0.0% 373 98s Cutting planes: Clique: 138 Zero half: 15 Explored 42 nodes (86922 simplex iterations) in 98.15 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%