Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:58:32 2013 Optimize a model with 37881 rows, 3721 columns and 115351 nonzeros Presolve removed 4727 rows and 1918 columns Presolve time: 0.28s Presolved: 33154 rows, 1803 columns, 100910 nonzeros Variable types: 25 continuous, 1778 integer (1778 binary) Found heuristic solution: objective 91848.000000 Root relaxation: objective 7.512262e+04, 12062 iterations, 1.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 75122.6200 0 5 91848.0000 75122.6200 18.2% - 1s H 0 0 75139.000000 75122.6200 0.02% - 1s H 0 0 75137.000000 75122.6200 0.02% - 1s H 0 0 75128.000000 75122.6200 0.01% - 1s Explored 0 nodes (12072 simplex iterations) in 1.44 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.512800000000e+04, best bound 7.512300000000e+04, gap 0.0067%