Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:00:02 2013 Optimize a model with 1800 rows, 27150 columns and 57250 nonzeros Presolve removed 50 rows and 50 columns Presolve time: 0.19s Presolved: 1750 rows, 27100 columns, 56200 nonzeros Variable types: 26100 continuous, 1000 integer (1000 binary) Root relaxation: objective 2.208160e+05, 1916 iterations, 0.08 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 220815.985 0 8 - 220815.985 - - 0s 0 0 220887.269 0 8 - 220887.269 - - 0s 0 0 220903.236 0 8 - 220903.236 - - 0s 0 0 220903.993 0 8 - 220903.993 - - 0s 0 0 220905.661 0 4 - 220905.661 - - 0s 0 0 220905.661 0 4 - 220905.661 - - 0s 0 0 220905.661 0 4 - 220905.661 - - 0s 0 0 220905.661 0 4 - 220905.661 - - 1s 0 0 220905.661 0 4 - 220905.661 - - 1s 0 2 220905.661 0 4 - 220905.661 - - 2s * 37 11 19 221476.88753 221222.880 0.11% 91.8 3s * 41 6 21 221476.58715 221222.880 0.11% 83.5 3s Cutting planes: Implied bound: 15 Flow cover: 9 Explored 48 nodes (6778 simplex iterations) in 3.81 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.214765871511e+05, best bound 2.214592107076e+05, gap 0.0078%