Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:30:52 2013 Optimize a model with 52632 rows, 51912 columns and 207432 nonzeros Presolve removed 2809 rows and 0 columns Presolve time: 0.33s Presolved: 49823 rows, 51912 columns, 201814 nonzeros Variable types: 51840 continuous, 72 integer (72 binary) Root relaxation: objective 8.568105e+04, 12389 iterations, 2.65 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 85681.0515 0 4 - 85681.0515 - - 3s H 0 0 88075.000000 85681.0515 2.72% - 3s H 0 0 86816.000000 85681.0515 1.31% - 3s 0 0 85681.1245 0 5 86816.0000 85681.1245 1.31% - 3s 0 0 85681.1245 0 5 86816.0000 85681.1245 1.31% - 4s 0 2 85688.4632 0 5 86816.0000 85688.4632 1.30% - 5s H 5 5 86522.444444 86086.1734 0.50% 305 6s * 6 6 5 86238.000000 86086.1734 0.18% 268 6s Cutting planes: Gomory: 1 Flow cover: 3 Explored 12 nodes (14427 simplex iterations) in 6.80 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.623800000000e+04, best bound 8.623800000000e+04, gap 0.0%