Gurobi 5.0.1 (linux64) logging started Fri Nov 16 17:42:39 2012 Optimize a model with 4859 rows, 8190 columns and 22318 nonzeros Presolve removed 30 rows and 2522 columns Presolve time: 0.11s Presolved: 4829 rows, 5668 columns, 19690 nonzeros Variable types: 0 continuous, 5668 integer (5668 binary) Found heuristic solution: objective 90.0000000 Found heuristic solution: objective 3.0000000 Root relaxation: objective 2.000000e+00, 122 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 54 3.00000 2.00000 33.3% - 0s 0 0 infeasible 0 3.00000 2.00000 33.3% - 0s Explored 0 nodes (237 simplex iterations) in 0.14 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 3.000000000000e+00, gap 0.0%