Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:11:41 2012 Optimize a model with 20645 rows, 5550 columns and 67116 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.72s Presolved: 20717 rows, 5548 columns, 72034 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 3858 iterations, 0.18 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 0 684 5.00000 2.66667 46.7% - 11s H 0 0 4.0000000 2.66667 33.3% - 12s 0 0 2.67606 0 4951 4.00000 2.67606 33.1% - 13s 0 0 2.67606 0 4938 4.00000 2.67606 33.1% - 16s 0 0 2.67606 0 4941 4.00000 2.67606 33.1% - 17s 0 0 2.67606 0 4524 4.00000 2.67606 33.1% - 20s 0 0 2.67606 0 4304 4.00000 2.67606 33.1% - 22s 0 0 2.67606 0 4232 4.00000 2.67606 33.1% - 24s 0 0 2.67606 0 4298 4.00000 2.67606 33.1% - 26s 0 0 2.67606 0 4294 4.00000 2.67606 33.1% - 28s 0 0 2.67606 0 4330 4.00000 2.67606 33.1% - 30s 0 0 2.67606 0 4341 4.00000 2.67606 33.1% - 32s 0 0 2.67606 0 4332 4.00000 2.67606 33.1% - 35s 0 0 2.67606 0 4299 4.00000 2.67606 33.1% - 37s 0 0 2.67606 0 4308 4.00000 2.67606 33.1% - 38s 0 0 2.67606 0 4308 4.00000 2.67606 33.1% - 39s 0 1 3.00000 0 4307 4.00000 3.00000 25.0% - 73s Cutting planes: Clique: 207 Zero half: 12 Explored 4 nodes (81386 simplex iterations) in 74.05 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%