Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:57:44 2013 Optimize a model with 34279 rows, 3481 columns and 104430 nonzeros Presolve removed 3886 rows and 1785 columns Presolve time: 0.24s Presolved: 30393 rows, 1696 columns, 92520 nonzeros Variable types: 24 continuous, 1672 integer (1672 binary) Found heuristic solution: objective 86576.000000 Root relaxation: objective 6.930317e+04, 9605 iterations, 0.60 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 69303.1708 0 6 86576.0000 69303.1708 20.0% - 0s H 0 0 69305.000000 69303.1708 0.00% - 0s Explored 0 nodes (9609 simplex iterations) in 0.94 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.930500000000e+04, best bound 6.930400000000e+04, gap 0.0014%