Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:56:55 2013 Optimize a model with 44286 rows, 43626 columns and 174306 nonzeros Presolve removed 2543 rows and 0 columns Presolve time: 0.26s Presolved: 41743 rows, 43626 columns, 169220 nonzeros Variable types: 43560 continuous, 66 integer (66 binary) Root relaxation: objective 6.862722e+04, 7893 iterations, 1.31 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 68627.2229 0 3 - 68627.2229 - - 1s H 0 0 69411.000000 68627.2229 1.13% - 1s H 0 0 68773.000000 68627.2229 0.21% - 1s 0 0 68627.9725 0 4 68773.0000 68627.9725 0.21% - 2s 0 0 68628.0553 0 4 68773.0000 68628.0553 0.21% - 2s 0 0 68628.0578 0 4 68773.0000 68628.0578 0.21% - 2s 0 0 68630.2039 0 2 68773.0000 68630.2039 0.21% - 3s 0 0 68630.2039 0 2 68773.0000 68630.2039 0.21% - 4s 0 0 68630.4345 0 3 68773.0000 68630.4345 0.21% - 4s 0 0 68630.5110 0 3 68773.0000 68630.5110 0.21% - 4s 0 0 68630.5211 0 3 68773.0000 68630.5211 0.21% - 4s 0 2 68630.7939 0 3 68773.0000 68630.7939 0.21% - 5s * 7 4 4 68704.000000 68688.4697 0.02% 55.0 5s * 10 2 3 68691.000000 68688.5385 0.00% 44.5 5s Cutting planes: Gomory: 1 Flow cover: 4 Explored 11 nodes (11019 simplex iterations) in 5.66 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.869100000000e+04, best bound 6.868853846154e+04, gap 0.0036%