Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:15:49 2013 Optimize a model with 28673 rows, 28143 columns and 112413 nonzeros Presolve removed 1284 rows and 0 columns Presolve time: 0.16s Presolved: 27389 rows, 28143 columns, 109845 nonzeros Variable types: 28090 continuous, 53 integer (53 binary) Root relaxation: objective 5.513750e+04, 5250 iterations, 0.60 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55137.4970 0 3 - 55137.4970 - - 0s H 0 0 55610.000000 55137.4970 0.85% - 0s H 0 0 55247.000000 55137.4970 0.20% - 1s 0 0 55152.3285 0 4 55247.0000 55152.3285 0.17% - 1s 0 0 55152.3285 0 4 55247.0000 55152.3285 0.17% - 1s 0 0 55215.3556 0 1 55247.0000 55215.3556 0.06% - 1s 0 0 55215.3556 0 1 55247.0000 55215.3556 0.06% - 2s 0 0 55215.3556 0 1 55247.0000 55215.3556 0.06% - 2s 0 0 cutoff 0 55247.0000 55247.0000 0.0% - 2s Cutting planes: Flow cover: 1 Explored 0 nodes (6471 simplex iterations) in 2.14 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.524700000000e+04, best bound 5.524700000000e+04, gap 0.0%