Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:10:26 2013 Optimize a model with 25550 rows, 25050 columns and 100050 nonzeros Presolve removed 2502 rows and 0 columns Presolve time: 0.14s Presolved: 23048 rows, 25050 columns, 95046 nonzeros Variable types: 25000 continuous, 50 integer (50 binary) Root relaxation: objective 5.068134e+04, 4046 iterations, 0.40 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 50681.3396 0 5 - 50681.3396 - - 0s H 0 0 51676.000000 50681.3396 1.92% - 0s 0 0 50682.6890 0 7 51676.0000 50682.6890 1.92% - 0s 0 0 50683.7576 0 7 51676.0000 50683.7576 1.92% - 1s 0 0 50684.3047 0 7 51676.0000 50684.3047 1.92% - 1s H 0 0 50780.000000 50684.3047 0.19% - 1s 0 0 50686.0625 0 5 50780.0000 50686.0625 0.18% - 1s 0 0 50689.2586 0 6 50780.0000 50689.2586 0.18% - 2s 0 0 50689.2586 0 6 50780.0000 50689.2586 0.18% - 2s 0 2 50693.2848 0 6 50780.0000 50693.2848 0.17% - 2s Cutting planes: Gomory: 2 Flow cover: 5 Explored 8 nodes (5872 simplex iterations) in 2.55 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.078000000000e+04, best bound 5.078000000000e+04, gap 0.0%