Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:58:10 2013 Optimize a model with 36050 rows, 3600 columns and 109800 nonzeros Presolve removed 5598 rows and 1883 columns Presolve time: 0.25s Presolved: 30452 rows, 1717 columns, 92322 nonzeros Variable types: 17 continuous, 1700 integer (1700 binary) Found heuristic solution: objective 85079.000000 Root relaxation: objective 7.215745e+04, 8161 iterations, 0.51 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 72157.4507 0 10 85079.0000 72157.4507 15.2% - 0s H 0 0 72188.000000 72157.4507 0.04% - 0s H 0 0 72179.000000 72157.4507 0.03% - 0s 0 0 72158.1796 0 20 72179.0000 72158.1796 0.03% - 1s 0 0 72158.1796 0 7 72179.0000 72158.1796 0.03% - 1s H 0 0 72162.000000 72158.1796 0.01% - 1s Explored 0 nodes (9426 simplex iterations) in 1.26 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.216200000000e+04, best bound 7.215900000000e+04, gap 0.0042%