Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:18:41 2013 Optimize a model with 61698 rows, 60918 columns and 243438 nonzeros Presolve removed 2265 rows and 0 columns Presolve time: 0.38s Presolved: 59433 rows, 60918 columns, 238908 nonzeros Variable types: 60840 continuous, 78 integer (78 binary) Root relaxation: objective 9.042589e+04, 14855 iterations, 3.70 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 90425.8928 0 3 - 90425.8928 - - 4s H 0 0 91256.000000 90425.8928 0.91% - 4s H 0 0 90580.000000 90425.8928 0.17% - 4s 0 0 90428.4116 0 4 90580.0000 90428.4116 0.17% - 5s 0 0 90428.4116 0 3 90580.0000 90428.4116 0.17% - 7s 0 0 90429.5136 0 4 90580.0000 90429.5136 0.17% - 7s 0 2 90433.9465 0 4 90580.0000 90433.9465 0.16% - 8s Cutting planes: Gomory: 1 Flow cover: 5 Explored 8 nodes (21381 simplex iterations) in 9.20 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 9.058000000000e+04, best bound 9.058000000000e+04, gap 0.0%