Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:38:16 2013 Optimize a model with 54093 rows, 53363 columns and 213233 nonzeros Presolve removed 2664 rows and 0 columns Presolve time: 0.34s Presolved: 51429 rows, 53363 columns, 207905 nonzeros Variable types: 53290 continuous, 73 integer (73 binary) Root relaxation: objective 7.160784e+04, 8367 iterations, 1.43 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 71607.8438 0 4 - 71607.8438 - - 1s H 0 0 72533.000000 71607.8438 1.28% - 2s 0 0 71617.2126 0 6 72533.0000 71617.2126 1.26% - 2s 0 0 71617.8915 0 6 72533.0000 71617.8915 1.26% - 2s H 0 0 72293.000000 71617.8915 0.93% - 3s 0 0 71617.8915 0 4 72293.0000 71617.8915 0.93% - 5s 0 0 71633.0668 0 5 72293.0000 71633.0668 0.91% - 6s 0 0 71633.4600 0 5 72293.0000 71633.4600 0.91% - 6s 0 0 71633.6526 0 5 72293.0000 71633.6526 0.91% - 6s 0 0 71633.6526 0 5 72293.0000 71633.6526 0.91% - 7s 0 0 71633.6526 0 5 72293.0000 71633.6526 0.91% - 7s 0 0 71633.8118 0 5 72293.0000 71633.8118 0.91% - 7s 0 2 71638.8799 0 5 72293.0000 71638.8799 0.90% - 8s H 2 2 72054.431751 71761.4234 0.41% 39.0 8s H 3 3 71945.283186 71774.7699 0.24% 68.7 8s H 4 2 71941.047619 71780.4286 0.22% 66.0 8s H 8 2 71900.722222 71793.4360 0.15% 80.1 9s * 9 1 7 71847.000000 71793.4360 0.07% 82.6 9s Cutting planes: Gomory: 1 Flow cover: 5 Explored 11 nodes (15112 simplex iterations) in 9.09 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.184700000000e+04, best bound 7.184700000000e+04, gap 0.0%