Gurobi 5.0.1 (linux64) logging started Mon Feb 4 17:43:51 2013 Optimize a model with 7175 rows, 1225 columns and 22050 nonzeros Presolve removed 1124 rows and 631 columns Presolve time: 0.05s Presolved: 6051 rows, 594 columns, 18631 nonzeros Variable types: 15 continuous, 579 integer (579 binary) Found heuristic solution: objective 24997.000000 Root relaxation: objective 1.913650e+04, 2109 iterations, 0.06 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 19136.5000 0 7 24997.0000 19136.5000 23.4% - 0s H 0 0 19142.000000 19136.5000 0.03% - 0s H 0 0 19139.000000 19136.5000 0.01% - 0s 0 0 19136.8331 0 19 19139.0000 19136.8331 0.01% - 0s 0 0 19136.8331 0 8 19139.0000 19136.8331 0.01% - 0s 0 0 19136.8788 0 19 19139.0000 19136.8788 0.01% - 0s 0 0 cutoff 0 19139.0000 19138.0191 0.01% - 0s Cutting planes: Cover: 4 Implied bound: 3 Clique: 3 MIR: 6 GUB cover: 1 Explored 0 nodes (2289 simplex iterations) in 0.19 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.913900000000e+04, best bound 1.913900000000e+04, gap 0.0%