Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:56:26 2013 Optimize a model with 27775 rows, 3025 columns and 84700 nonzeros Presolve removed 2710 rows and 1542 columns Presolve time: 0.19s Presolved: 25065 rows, 1483 columns, 76287 nonzeros Variable types: 21 continuous, 1462 integer (1462 binary) Found heuristic solution: objective 69764.000000 Root relaxation: objective 5.665895e+04, 8394 iterations, 0.53 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 56658.9500 0 9 69764.0000 56658.9500 18.8% - 0s H 0 0 56673.000000 56658.9500 0.02% - 0s H 0 0 56666.000000 56658.9500 0.01% - 0s 0 0 56661.0012 0 17 56666.0000 56661.0012 0.01% - 0s Cutting planes: Gomory: 1 Implied bound: 1 MIR: 7 Mod-K: 2 Explored 0 nodes (8483 simplex iterations) in 0.93 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.666600000000e+04, best bound 5.666100120332e+04, gap 0.0088%