Gurobi 5.0.1 (linux64) logging started Wed Apr 24 00:58:54 2013 Optimize a model with 440 rows, 16040 columns and 32040 nonzeros Presolve time: 0.02s Presolved: 440 rows, 16040 columns, 32040 nonzeros Variable types: 16000 continuous, 40 integer (40 binary) Root relaxation: objective 4.308335e+04, 919 iterations, 0.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 43083.3466 0 7 - 43083.3466 - - 0s H 0 0 44750.000000 43083.3466 3.72% - 0s H 0 0 43818.000000 43083.3466 1.68% - 0s 0 0 43365.0382 0 6 43818.0000 43365.0382 1.03% - 0s 0 0 43430.1736 0 5 43818.0000 43430.1736 0.89% - 0s 0 0 43482.4246 0 4 43818.0000 43482.4246 0.77% - 0s 0 0 43499.0310 0 4 43818.0000 43499.0310 0.73% - 0s 0 0 43507.8991 0 4 43818.0000 43507.8991 0.71% - 0s 0 0 43511.6638 0 4 43818.0000 43511.6638 0.70% - 0s 0 0 43512.8403 0 4 43818.0000 43512.8403 0.70% - 0s 0 0 43512.8403 0 4 43818.0000 43512.8403 0.70% - 0s 0 2 43515.4034 0 4 43818.0000 43515.4034 0.69% - 0s Cutting planes: Implied bound: 80 Flow cover: 5 Explored 8 nodes (1541 simplex iterations) in 0.41 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.381800000000e+04, best bound 4.381800000000e+04, gap 0.0%