Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:12:28 2012 Optimize a model with 20293 rows, 5402 columns and 65917 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.70s Presolved: 20291 rows, 5400 columns, 65361 nonzeros Variable types: 0 continuous, 5400 integer (5400 binary) Found heuristic solution: objective 73.0000000 Root relaxation: objective 2.000000e+00, 4021 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 0 146 73.00000 2.00000 97.3% - 1s H 0 0 70.0000000 2.00000 97.1% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 687 5.00000 2.66667 46.7% - 15s 0 0 2.66667 0 2116 5.00000 2.66667 46.7% - 15s 0 0 2.66667 0 211 5.00000 2.66667 46.7% - 18s 0 0 2.66981 0 4500 5.00000 2.66981 46.6% - 20s 0 0 2.66981 0 4501 5.00000 2.66981 46.6% - 23s 0 0 2.66981 0 4501 5.00000 2.66981 46.6% - 24s 0 0 2.66981 0 4505 5.00000 2.66981 46.6% - 26s 0 0 2.66981 0 4504 5.00000 2.66981 46.6% - 27s 0 0 2.66981 0 4471 5.00000 2.66981 46.6% - 29s 0 0 2.66981 0 4472 5.00000 2.66981 46.6% - 30s 0 0 2.66981 0 4543 5.00000 2.66981 46.6% - 31s 0 0 2.66981 0 4543 5.00000 2.66981 46.6% - 31s 0 2 2.80000 0 4543 5.00000 2.80000 44.0% - 86s 27 23 4.00000 22 143 5.00000 3.00000 40.0% 344 90s * 96 3 23 4.0000000 4.00000 0.0% 159 93s Cutting planes: Clique: 170 Zero half: 19 Explored 97 nodes (76330 simplex iterations) in 93.50 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%