Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:14:28 2012 Optimize a model with 20053 rows, 5550 columns and 65340 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.70s Presolved: 20125 rows, 5548 columns, 70274 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 3957 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 69.0000000 2.00000 97.1% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 205 5.00000 2.66667 46.7% - 10s 0 0 2.66977 0 5060 5.00000 2.66977 46.6% - 10s 0 0 2.66977 0 5051 5.00000 2.66977 46.6% - 12s 0 0 2.66977 0 5049 5.00000 2.66977 46.6% - 13s 0 0 2.66977 0 5056 5.00000 2.66977 46.6% - 14s 0 0 2.66977 0 4667 5.00000 2.66977 46.6% - 17s 0 0 2.66977 0 4601 5.00000 2.66977 46.6% - 19s 0 0 2.66977 0 4461 5.00000 2.66977 46.6% - 21s 0 0 2.66977 0 4453 5.00000 2.66977 46.6% - 23s 0 0 2.66977 0 4467 5.00000 2.66977 46.6% - 24s 0 0 2.66977 0 4471 5.00000 2.66977 46.6% - 26s 0 0 2.66977 0 4493 5.00000 2.66977 46.6% - 28s 0 0 2.66977 0 4510 5.00000 2.66977 46.6% - 29s 0 0 2.66977 0 4510 5.00000 2.66977 46.6% - 30s 0 2 2.80000 0 4510 5.00000 2.80000 44.0% - 72s 27 19 4.00000 19 72 5.00000 3.00000 40.0% 370 75s * 33 3 24 4.0000000 3.00000 25.0% 310 75s Cutting planes: Clique: 138 Zero half: 17 Explored 37 nodes (83357 simplex iterations) in 76.99 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%