Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:20 2012 Optimize a model with 720 rows, 53 columns and 1440 nonzeros Presolve removed 508 rows and 0 columns Presolve time: 0.01s Presolved: 212 rows, 53 columns, 1259 nonzeros Variable types: 0 continuous, 53 integer (53 binary) Found heuristic solution: objective 6.0000000 Root relaxation: objective 9.008299e+00, 121 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 9.00830 0 50 6.00000 9.00830 50.1% - 0s H 0 0 8.0000000 9.00830 12.6% - 0s Cutting planes: Gomory: 1 Explored 0 nodes (121 simplex iterations) in 0.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.000000000000e+00, best bound 9.000000000000e+00, gap 12.5000%