Gurobi 5.0.1 (linux64) logging started Mon Feb 4 19:01:58 2013 Optimize a model with 50183 rows, 4489 columns and 152626 nonzeros Presolve removed 5202 rows and 2299 columns Presolve time: 0.40s Presolved: 44981 rows, 2190 columns, 136601 nonzeros Variable types: 26 continuous, 2164 integer (2164 binary) Found heuristic solution: objective 86728.000000 Root relaxation: objective 6.589710e+04, 9730 iterations, 0.86 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 65897.1048 0 10 86728.0000 65897.1048 24.0% - 1s H 0 0 65903.000000 65897.1048 0.01% - 1s Explored 0 nodes (9785 simplex iterations) in 1.50 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.590300000000e+04, best bound 6.589800000000e+04, gap 0.0076%