Gurobi 5.0.1 (linux64) logging started Wed Apr 24 15:34:57 2013 Optimize a model with 3410 rows, 961310 columns and 1922310 nonzeros Presolve removed 0 rows and 0 columns (presolve time = 7s) ... Presolve time: 7.91s Presolved: 3410 rows, 961310 columns, 1922310 nonzeros Variable types: 961000 continuous, 310 integer (310 binary) Starting sifting (using dual simplex for sub-problems)... Iter Pivots Primal Obj Dual Obj Time 0 0 infinity 5.1874000e+04 0s 1 14227 1.6811000e+10 7.3872348e+04 0s 2 24344 9.5679729e+07 7.7101208e+04 1s 3 32422 1.4238527e+06 8.0122475e+04 1s 4 44631 1.0119679e+06 1.3466521e+05 1s 5 57125 8.4423632e+05 2.4497844e+05 2s 6 72592 8.2529845e+05 4.1775424e+05 2s 7 85313 8.2394222e+05 7.7277013e+05 2s 8 94413 8.2343429e+05 8.2189707e+05 3s 9 98823 8.2338889e+05 8.2262126e+05 3s Sifting complete Root relaxation: objective 8.233877e+05, 103063 iterations, 2.83 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 823387.745 0 6 - 823387.745 - - 11s H 0 0 891087.00000 823387.745 7.60% - 15s 0 0 823567.580 0 4 891087.000 823567.580 7.58% - 19s 0 0 823617.170 0 3 891087.000 823617.170 7.57% - 23s H 0 0 850077.03393 823617.170 3.11% - 23s H 0 0 849377.00000 823617.170 3.03% - 25s 0 0 823645.043 0 3 849377.000 823645.043 3.03% - 27s 0 0 823645.043 0 6 849377.000 823645.043 3.03% - 41s 0 0 823645.043 0 4 849377.000 823645.043 3.03% - 46s 0 0 823645.043 0 3 849377.000 823645.043 3.03% - 48s 0 0 823645.043 0 3 849377.000 823645.043 3.03% - 51s 0 0 823655.455 0 3 849377.000 823655.455 3.03% - 53s H 0 0 849088.00000 823655.455 3.00% - 53s 0 0 823663.405 0 3 849088.000 823663.405 2.99% - 55s H 0 0 841909.00000 823663.405 2.17% - 55s 0 0 823663.405 0 3 841909.000 823663.405 2.17% - 56s 0 0 823664.937 0 3 841909.000 823664.937 2.17% - 58s 0 0 823664.937 0 3 841909.000 823664.937 2.17% - 60s 0 0 823665.293 0 3 841909.000 823665.293 2.17% - 62s 0 0 823665.293 0 3 841909.000 823665.293 2.17% - 64s 0 2 823676.079 0 3 841909.000 823676.079 2.17% - 71s 1 3 823708.671 1 3 841909.000 823708.671 2.16% 438 75s H 2 2 829329.00000 823708.671 0.68% 219 75s H 9 9 826021.00000 823708.671 0.28% 97.4 80s 18 18 823800.484 18 1 826021.000 823708.671 0.28% 62.4 85s H 22 10 824869.00000 823708.671 0.14% 55.2 86s H 23 7 824181.00000 823708.671 0.06% 53.7 87s * 28 7 26 824139.00000 823708.671 0.05% 47.7 88s * 31 6 27 824108.00000 823708.671 0.05% 43.6 89s 32 7 823942.961 2 3 824108.000 823716.063 0.05% 59.3 90s 40 8 823944.945 6 2 824108.000 823814.336 0.04% 82.7 95s 53 10 823942.311 11 1 824108.000 823941.400 0.02% 94.4 100s Cutting planes: Implied bound: 149 Flow cover: 3 Explored 66 nodes (137899 simplex iterations) in 104.65 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.241080000000e+05, best bound 8.240388672128e+05, gap 0.0084%