Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:48 2013 Optimize a model with 600 rows, 8220 columns and 48560 nonzeros Presolve removed 20 rows and 20 columns Presolve time: 0.06s Presolved: 580 rows, 8200 columns, 44540 nonzeros Variable types: 8040 continuous, 160 integer (160 binary) Root relaxation: objective 3.839329e+04, 462 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38393.2919 0 6 - 38393.2919 - - 0s 0 0 38394.7977 0 6 - 38394.7977 - - 0s 0 0 38397.8392 0 9 - 38397.8392 - - 0s 0 0 38398.0868 0 9 - 38398.0868 - - 0s 0 0 38398.3233 0 12 - 38398.3233 - - 0s 0 0 38398.3798 0 13 - 38398.3798 - - 0s 0 0 38398.3798 0 13 - 38398.3798 - - 0s H 0 0 41679.510759 38398.3798 7.87% - 0s 0 2 38398.3934 0 13 41679.5108 38398.3934 7.87% - 0s H 27 9 38638.402502 38513.4243 0.32% 9.2 0s * 38 10 35 38638.294584 38513.4243 0.32% 7.4 0s Cutting planes: Flow cover: 8 Explored 46 nodes (952 simplex iterations) in 0.92 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.863829458371e+04, best bound 3.863464296250e+04, gap 0.0095%