Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:16:06 2013 Optimize a model with 28673 rows, 28143 columns and 112413 nonzeros Presolve removed 3343 rows and 0 columns Presolve time: 0.16s Presolved: 25330 rows, 28143 columns, 105727 nonzeros Variable types: 28090 continuous, 53 integer (53 binary) Root relaxation: objective 7.252177e+04, 6213 iterations, 0.57 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 72521.7696 0 2 - 72521.7696 - - 0s H 0 0 72778.000000 72521.7696 0.35% - 0s H 0 0 72569.000000 72521.7696 0.07% - 0s 0 0 72524.0513 0 2 72569.0000 72524.0513 0.06% - 1s 0 0 72524.0513 0 2 72569.0000 72524.0513 0.06% - 1s 0 0 72524.0513 0 2 72569.0000 72524.0513 0.06% - 1s 0 0 72536.9168 0 2 72569.0000 72536.9168 0.04% - 1s 0 0 72566.0000 0 1 72569.0000 72566.0000 0.00% - 1s Cutting planes: Gomory: 1 Explored 0 nodes (6346 simplex iterations) in 1.66 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.256900000000e+04, best bound 7.256600000000e+04, gap 0.0041%