Gurobi 5.0.1 (linux64) logging started Mon Feb 4 19:00:23 2013 Optimize a model with 43744 rows, 4096 columns and 133120 nonzeros Presolve removed 3391 rows and 2072 columns Presolve time: 0.33s Presolved: 40353 rows, 2024 columns, 122888 nonzeros Variable types: 30 continuous, 1994 integer (1994 binary) Found heuristic solution: objective 77762.000000 Root relaxation: objective 5.404754e+04, 12430 iterations, 0.96 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54047.5385 0 19 77762.0000 54047.5385 30.5% - 1s H 0 0 54068.000000 54047.5385 0.04% - 1s H 0 0 54066.000000 54047.5385 0.03% - 1s H 0 0 54057.000000 54047.5385 0.02% - 1s 0 0 54048.0000 0 29 54057.0000 54048.0000 0.02% - 1s 0 0 54048.0000 0 18 54057.0000 54048.0000 0.02% - 2s 0 0 54048.0000 0 28 54057.0000 54048.0000 0.02% - 2s 0 0 54048.0000 0 40 54057.0000 54048.0000 0.02% - 2s 0 0 54048.0000 0 31 54057.0000 54048.0000 0.02% - 2s H 0 0 54056.000000 54048.0000 0.01% - 2s 0 0 54048.0000 0 31 54056.0000 54048.0000 0.01% - 2s 0 0 54048.0000 0 18 54056.0000 54048.0000 0.01% - 2s H 0 0 54054.000000 54048.0000 0.01% - 2s 0 0 54048.0000 0 29 54054.0000 54048.0000 0.01% - 2s 0 2 54048.0000 0 25 54054.0000 54048.0000 0.01% - 2s H 1 2 54053.000000 54048.0000 0.01% 78.0 2s Explored 2 nodes (18329 simplex iterations) in 2.65 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.405300000000e+04, best bound 5.404800000000e+04, gap 0.0093%