Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:57:54 2013 Optimize a model with 34279 rows, 3481 columns and 104430 nonzeros Presolve removed 3243 rows and 1774 columns Presolve time: 0.24s Presolved: 31036 rows, 1707 columns, 94393 nonzeros Variable types: 23 continuous, 1684 integer (1684 binary) Found heuristic solution: objective 76878.000000 Root relaxation: objective 5.666506e+04, 6748 iterations, 0.43 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 56665.0620 0 9 76878.0000 56665.0620 26.3% - 0s H 0 0 56671.000000 56665.0620 0.01% - 0s H 0 0 56668.000000 56665.0620 0.01% - 0s Explored 0 nodes (6758 simplex iterations) in 0.80 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.666800000000e+04, best bound 5.666600000000e+04, gap 0.0035%