Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:22:38 2013 Optimize a model with 9177 rows, 1444 columns and 28158 nonzeros Presolve removed 1284 rows and 738 columns Presolve time: 0.06s Presolved: 7893 rows, 706 columns, 24377 nonzeros Variable types: 20 continuous, 686 integer (686 binary) Found heuristic solution: objective 28061.000000 Root relaxation: objective 1.995163e+04, 4751 iterations, 0.16 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 19951.6333 0 10 28061.0000 19951.6333 28.9% - 0s H 0 0 19959.000000 19951.6333 0.04% - 0s H 0 0 19956.000000 19951.6333 0.02% - 0s 0 0 19952.5333 0 7 19956.0000 19952.5333 0.02% - 0s 0 0 19952.5333 0 7 19956.0000 19952.5333 0.02% - 0s 0 0 19952.5333 0 15 19956.0000 19952.5333 0.02% - 0s 0 0 19952.5835 0 14 19956.0000 19952.5835 0.02% - 0s 0 0 19953.1778 0 27 19956.0000 19953.1778 0.01% - 0s 0 0 19953.5040 0 21 19956.0000 19953.5040 0.01% - 0s 0 1 19953.7297 0 21 19956.0000 19953.7297 0.01% - 0s Cutting planes: Gomory: 7 Cover: 3 Implied bound: 5 Clique: 1 MIR: 9 GUB cover: 1 Zero half: 3 Explored 4 nodes (5037 simplex iterations) in 0.35 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.995600000000e+04, best bound 1.995600000000e+04, gap 0.0%