Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:18:01 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 3.894400e+04, 460 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38944.0027 0 6 - 38944.0027 - - 0s 0 0 38947.1436 0 6 - 38947.1436 - - 0s 0 0 38947.4567 0 8 - 38947.4567 - - 0s 0 0 38948.6460 0 10 - 38948.6460 - - 0s 0 0 38948.7481 0 10 - 38948.7481 - - 0s 0 0 38948.7481 0 10 - 38948.7481 - - 0s 0 2 38953.3960 0 10 - 38953.3960 - - 0s * 28 11 27 39260.198825 39115.2199 0.37% 9.4 0s * 50 12 19 39252.247566 39217.4826 0.09% 7.7 0s * 54 9 19 39252.214105 39217.4826 0.09% 7.3 0s H 57 2 39247.135892 39245.6787 0.00% 7.0 0s Cutting planes: Flow cover: 6 Explored 57 nodes (1066 simplex iterations) in 0.89 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.924713589172e+04, best bound 3.924567868870e+04, gap 0.0037%