Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:54 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 4.370285e+04, 655 iterations, 0.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 43702.8549 0 6 - 43702.8549 - - 0s 0 0 43704.3626 0 6 - 43704.3626 - - 0s 0 0 43704.4228 0 7 - 43704.4228 - - 0s 0 0 43704.4228 0 7 - 43704.4228 - - 0s 0 0 43704.4613 0 7 - 43704.4613 - - 0s 0 0 43704.4613 0 7 - 43704.4613 - - 0s 0 0 43704.4613 0 7 - 43704.4613 - - 0s H 0 0 46193.382195 43704.4613 5.39% - 0s 0 2 43709.0127 0 7 46193.3822 43709.0127 5.38% - 0s * 19 10 18 44047.126891 43852.1895 0.44% 11.4 0s * 37 14 13 44040.353095 43878.1429 0.37% 9.7 0s * 77 24 20 44017.632026 43900.7573 0.27% 7.5 0s * 85 22 27 43950.743160 43900.7573 0.11% 7.0 0s H 88 18 43945.708401 43900.7573 0.10% 6.8 0s * 90 20 27 43944.441226 43900.7573 0.10% 6.9 0s * 92 18 28 43943.499231 43900.7573 0.10% 6.8 0s * 97 7 12 43903.219162 43900.8161 0.01% 6.6 0s Cutting planes: Flow cover: 8 Explored 98 nodes (1565 simplex iterations) in 0.93 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.390321916219e+04, best bound 4.390081613063e+04, gap 0.0055%