Gurobi 5.0.1 (linux64) logging started Fri Nov 16 21:02:05 2012 Optimize a model with 20855 rows, 25122 columns and 86898 nonzeros Presolve removed 29 rows and 4268 columns Presolve time: 0.44s Presolved: 20826 rows, 20854 columns, 82368 nonzeros Variable types: 0 continuous, 20854 integer (20854 binary) Found heuristic solution: objective 158.0000000 Root relaxation: objective 2.000000e+00, 15046 iterations, 0.89 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 228 158.00000 2.00000 98.7% - 2s H 0 0 153.0000000 2.00000 98.7% - 2s H 0 0 4.0000000 2.00000 50.0% - 2s H 0 0 3.0000000 2.00000 33.3% - 2s Cutting planes: Zero half: 1 Explored 0 nodes (49174 simplex iterations) in 3.06 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 2.000000000000e+00, gap 33.3333%