Gurobi 5.0.1 (linux64) logging started Fri Nov 16 17:44:04 2012 Optimize a model with 4608 rows, 9312 columns and 22752 nonzeros Presolve removed 227 rows and 3360 columns Presolve time: 0.13s Presolved: 4381 rows, 5952 columns, 18912 nonzeros Variable types: 0 continuous, 5952 integer (5952 binary) Found heuristic solution: objective 21.0000000 Found heuristic solution: objective 3.0000000 Root relaxation: cutoff, 6413 iterations, 0.17 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 cutoff 0 3.00000 2.00000 33.3% - 0s Explored 0 nodes (6413 simplex iterations) in 0.31 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%