Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:08:39 2013 Optimize a model with 24549 rows, 24059 columns and 96089 nonzeros Presolve removed 2435 rows and 0 columns Presolve time: 0.14s Presolved: 22114 rows, 24059 columns, 91219 nonzeros Variable types: 24010 continuous, 49 integer (49 binary) Root relaxation: objective 5.258777e+04, 3513 iterations, 0.26 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 52587.7674 0 3 - 52587.7674 - - 0s H 0 0 52634.000000 52587.7674 0.09% - 0s 0 0 52590.8091 0 4 52634.0000 52590.8091 0.08% - 0s 0 0 52590.8091 0 3 52634.0000 52590.8091 0.08% - 1s 0 0 52590.8091 0 4 52634.0000 52590.8091 0.08% - 1s 0 0 52590.8814 0 4 52634.0000 52590.8814 0.08% - 1s 0 0 52620.2469 0 2 52634.0000 52620.2469 0.03% - 1s 0 0 cutoff 0 52634.0000 52634.0000 0.0% - 1s Cutting planes: Flow cover: 1 Explored 0 nodes (4945 simplex iterations) in 1.24 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.263400000000e+04, best bound 5.263400000000e+04, gap 0.0%