Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:02:13 2012 Optimize a model with 20053 rows, 5550 columns and 65340 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.71s Presolved: 20051 rows, 5548 columns, 64798 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 4078 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 72.0000000 2.00000 97.2% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 402 5.00000 2.66667 46.7% - 12s 0 0 2.67925 0 4770 5.00000 2.67925 46.4% - 13s 0 0 2.67925 0 4763 5.00000 2.67925 46.4% - 16s 0 0 2.67925 0 4760 5.00000 2.67925 46.4% - 17s 0 0 2.67925 0 4758 5.00000 2.67925 46.4% - 18s 0 0 2.67925 0 4731 5.00000 2.67925 46.4% - 18s 0 0 2.67925 0 4742 5.00000 2.67925 46.4% - 19s 0 0 2.67925 0 4424 5.00000 2.67925 46.4% - 23s 0 0 2.67925 0 4438 5.00000 2.67925 46.4% - 25s 0 0 2.67925 0 4435 5.00000 2.67925 46.4% - 27s 0 0 2.67925 0 4494 5.00000 2.67925 46.4% - 30s 0 0 2.67925 0 4471 5.00000 2.67925 46.4% - 32s 0 0 2.67925 0 4503 5.00000 2.67925 46.4% - 35s 0 0 2.67925 0 4503 5.00000 2.67925 46.4% - 36s 0 2 3.00000 0 4503 5.00000 3.00000 40.0% - 71s * 25 6 22 4.0000000 3.00000 25.0% 639 73s Cutting planes: Clique: 263 Zero half: 14 Explored 31 nodes (89702 simplex iterations) in 73.94 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%