Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:08:37 2013 Optimize a model with 60137 rows, 59367 columns and 237237 nonzeros Presolve removed 3577 rows and 0 columns Presolve time: 0.40s Presolved: 56560 rows, 59367 columns, 230083 nonzeros Variable types: 59290 continuous, 77 integer (77 binary) Root relaxation: objective 8.845431e+04, 13087 iterations, 2.53 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 88454.3101 0 5 - 88454.3101 - - 3s H 0 0 92151.000000 88454.3101 4.01% - 3s 0 0 88460.0750 0 7 92151.0000 88460.0750 4.01% - 3s H 0 0 88597.000000 88460.0750 0.15% - 4s 0 0 88460.6880 0 6 88597.0000 88460.6880 0.15% - 4s 0 0 88460.6880 0 5 88597.0000 88460.6880 0.15% - 6s 0 0 88460.6880 0 7 88597.0000 88460.6880 0.15% - 6s 0 0 88460.6880 0 6 88597.0000 88460.6880 0.15% - 6s 0 0 88460.6880 0 6 88597.0000 88460.6880 0.15% - 7s 0 0 88510.3520 0 5 88597.0000 88510.3520 0.10% - 7s 0 2 88518.7627 0 5 88597.0000 88518.7627 0.09% - 8s * 6 4 5 88582.000000 88539.2698 0.05% 42.8 8s Cutting planes: Flow cover: 2 Explored 11 nodes (18849 simplex iterations) in 8.34 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.858200000000e+04, best bound 8.858200000000e+04, gap 0.0%