Gurobi 5.0.1 (linux64) logging started Mon Feb 4 19:05:38 2013 Optimize a model with 64897 rows, 5329 columns and 197173 nonzeros Presolve removed 5088 rows and 2703 columns Presolve time: 0.50s Presolved: 59809 rows, 2626 columns, 181734 nonzeros Variable types: 33 continuous, 2593 integer (2593 binary) Found heuristic solution: objective 109140.00000 Root relaxation: objective 8.192107e+04, 15584 iterations, 1.54 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 81921.0682 0 12 109140.000 81921.0682 24.9% - 2s H 0 0 81935.000000 81921.0682 0.02% - 2s H 0 0 81934.000000 81921.0682 0.02% - 2s H 0 0 81931.000000 81921.0682 0.01% - 2s 0 0 81923.0516 0 36 81931.0000 81923.0516 0.01% - 2s Cutting planes: Gomory: 6 Implied bound: 2 MIR: 8 Explored 0 nodes (15775 simplex iterations) in 2.68 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.193100000000e+04, best bound 8.192400000000e+04, gap 0.0085%