Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:35:53 2012 Optimize a model with 16519 rows, 4970 columns and 54178 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.55s Presolved: 16587 rows, 4968 columns, 58606 nonzeros Variable types: 0 continuous, 4968 integer (4968 binary) Found heuristic solution: objective 70.0000000 Root relaxation: objective 2.000000e+00, 3678 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 0 140 70.00000 2.00000 97.1% - 1s H 0 0 68.0000000 2.00000 97.1% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 530 5.00000 2.66667 46.7% - 9s H 0 0 4.0000000 2.66667 33.3% - 12s 0 0 2.68687 0 4537 4.00000 2.68687 32.8% - 13s 0 0 2.68687 0 4504 4.00000 2.68687 32.8% - 16s 0 0 2.68687 0 4489 4.00000 2.68687 32.8% - 17s 0 0 2.68687 0 4502 4.00000 2.68687 32.8% - 18s 0 0 2.68687 0 4198 4.00000 2.68687 32.8% - 22s 0 0 2.68687 0 4218 4.00000 2.68687 32.8% - 24s 0 0 2.68687 0 4145 4.00000 2.68687 32.8% - 26s 0 0 2.68687 0 4280 4.00000 2.68687 32.8% - 28s 0 0 2.68687 0 4278 4.00000 2.68687 32.8% - 30s 0 0 2.68687 0 4237 4.00000 2.68687 32.8% - 33s 0 0 2.68687 0 4237 4.00000 2.68687 32.8% - 36s 0 0 2.68687 0 4237 4.00000 2.68687 32.8% - 37s 0 1 3.00000 0 4237 4.00000 3.00000 25.0% - 60s Cutting planes: Clique: 310 Zero half: 7 Explored 4 nodes (78650 simplex iterations) in 60.84 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%