Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:02:29 2013 Optimize a model with 484 rows, 19404 columns and 38764 nonzeros Presolve time: 0.03s Presolved: 484 rows, 19404 columns, 38764 nonzeros Variable types: 19360 continuous, 44 integer (44 binary) Root relaxation: objective 5.119809e+04, 923 iterations, 0.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 51198.0918 0 6 - 51198.0918 - - 0s H 0 0 51548.000000 51198.0918 0.68% - 0s 0 0 51334.7380 0 3 51548.0000 51334.7380 0.41% - 0s H 0 0 51342.000000 51334.7380 0.01% - 0s 0 0 51336.5358 0 2 51342.0000 51336.5358 0.01% - 0s 0 0 51336.5358 0 6 51342.0000 51336.5358 0.01% - 0s 0 0 51336.5358 0 2 51342.0000 51336.5358 0.01% - 0s 0 0 51337.8879 0 2 51342.0000 51337.8879 0.01% - 0s Cutting planes: Implied bound: 34 Flow cover: 3 Explored 0 nodes (1719 simplex iterations) in 0.25 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.134200000000e+04, best bound 5.133788785047e+04, gap 0.0080%