Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:37:29 2013 Optimize a model with 54093 rows, 53363 columns and 213233 nonzeros Presolve removed 2634 rows and 0 columns Presolve time: 0.33s Presolved: 51459 rows, 53363 columns, 207965 nonzeros Variable types: 53290 continuous, 73 integer (73 binary) Root relaxation: objective 8.709588e+04, 11903 iterations, 2.25 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 87095.8783 0 4 - 87095.8783 - - 2s H 0 0 89546.000000 87095.8783 2.74% - 2s H 0 0 87338.000000 87095.8783 0.28% - 3s 0 0 87099.2283 0 5 87338.0000 87099.2283 0.27% - 3s 0 0 87099.2283 0 5 87338.0000 87099.2283 0.27% - 3s 0 0 87287.8377 0 3 87338.0000 87287.8377 0.06% - 4s 0 0 cutoff 0 87338.0000 87338.0000 0.0% - 4s Cutting planes: Flow cover: 1 Explored 0 nodes (12312 simplex iterations) in 4.53 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.733800000000e+04, best bound 8.733800000000e+04, gap 0.0%