Gurobi 5.0.1 (linux64) logging started Thu Jan 17 23:16:25 2013 Optimize a model with 320 rows, 4160 columns and 8340 nonzeros Presolve removed 40 rows and 60 columns Presolve time: 0.01s Presolved: 280 rows, 4100 columns, 8200 nonzeros Variable types: 4080 continuous, 20 integer (20 binary) Root relaxation: objective 4.013975e+04, 396 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 40139.7487 0 2 - 40139.7487 - - 0s 0 0 40139.7487 0 2 - 40139.7487 - - 0s 0 0 40139.7487 0 2 - 40139.7487 - - 0s 0 0 40141.0492 0 2 - 40141.0492 - - 0s 0 0 40141.0492 0 2 - 40141.0492 - - 0s H 0 0 40186.519006 40141.0492 0.11% - 0s 0 1 40147.7455 0 2 40186.5190 40147.7455 0.10% - 0s Cutting planes: Flow cover: 4 Explored 3 nodes (416 simplex iterations) in 0.08 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.018651900561e+04, best bound 4.018478729092e+04, gap 0.0043%