Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:15:34 2013 Optimize a model with 3000 rows, 121100 columns and 402800 nonzeros Presolve removed 100 rows and 100 columns Presolve time: 0.53s Presolved: 2900 rows, 121000 columns, 382700 nonzeros Variable types: 120200 continuous, 800 integer (800 binary) Root relaxation: objective 7.672886e+05, 6459 iterations, 0.51 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 767288.564 0 9 - 767288.564 - - 1s 0 0 767326.242 0 6 - 767326.242 - - 2s 0 0 767326.242 0 6 - 767326.242 - - 2s 0 0 767326.242 0 6 - 767326.242 - - 2s 0 0 767326.242 0 6 - 767326.242 - - 3s 0 0 767326.242 0 6 - 767326.242 - - 3s 0 0 767326.242 0 6 - 767326.242 - - 3s 0 0 767326.242 0 6 - 767326.242 - - 4s 0 2 767328.627 0 6 - 767328.627 - - 9s 1 3 767582.838 1 3 - 767582.838 - 533 10s 37 39 768346.004 35 3 - 767589.151 - 45.3 15s 68 70 768386.727 66 3 - 767589.151 - 26.8 20s 106 108 768403.539 104 3 - 767589.151 - 18.2 25s 135 137 768427.273 133 3 - 767589.151 - 14.9 30s 174 176 768501.858 172 3 - 767589.151 - 12.1 35s * 232 130 230 768655.85966 767589.151 0.14% 9.4 37s 305 184 768525.383 57 1 768655.860 767645.970 0.13% 11.0 40s * 384 23 31 768362.22809 767710.920 0.08% 10.3 41s * 445 20 25 768355.33837 768190.660 0.02% 11.0 43s Cutting planes: Flow cover: 5 Explored 464 nodes (13858 simplex iterations) in 44.05 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.683553383700e+05, best bound 7.682837503713e+05, gap 0.0093%