Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:04:26 2012 Optimize a model with 21015 rows, 5550 columns and 68226 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.74s Presolved: 21013 rows, 5548 columns, 67658 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 4000 iterations, 0.16 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 6.0000000 2.00000 66.7% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 3.00000 0 1969 5.00000 3.00000 40.0% - 19s 0 0 3.00000 0 2513 5.00000 3.00000 40.0% - 21s 0 0 3.00000 0 2515 5.00000 3.00000 40.0% - 33s 0 0 3.00000 0 173 5.00000 3.00000 40.0% - 45s 0 2 3.00000 0 140 5.00000 3.00000 40.0% - 59s 1 3 3.00348 1 3319 5.00000 3.00000 40.0% 34740 66s H 27 3 4.0000000 3.25000 18.8% 1693 69s Cutting planes: Gomory: 1 Clique: 20 Explored 27 nodes (163838 simplex iterations) in 69.27 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%