Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:58:24 2013 Optimize a model with 36050 rows, 3600 columns and 109800 nonzeros Presolve removed 2935 rows and 1818 columns Presolve time: 0.27s Presolved: 33115 rows, 1782 columns, 101165 nonzeros Variable types: 32 continuous, 1750 integer (1750 binary) Found heuristic solution: objective 69407.000000 Root relaxation: objective 4.872587e+04, 13336 iterations, 0.93 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 48725.8667 0 12 69407.0000 48725.8667 29.8% - 1s H 0 0 48731.000000 48725.8667 0.01% - 1s 0 0 48726.1556 0 19 48731.0000 48726.1556 0.01% - 1s Cutting planes: Gomory: 8 MIR: 9 Zero half: 1 Explored 0 nodes (13583 simplex iterations) in 1.56 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.873100000000e+04, best bound 4.872700000000e+04, gap 0.0082%