Gurobi 5.0.1 (linux64) logging started Mon Feb 4 17:08:42 2013 Optimize a model with 4991 rows, 961 columns and 15376 nonzeros Presolve removed 786 rows and 495 columns Presolve time: 0.04s Presolved: 4205 rows, 466 columns, 12947 nonzeros Variable types: 12 continuous, 454 integer (454 binary) Found heuristic solution: objective 16845.000000 Root relaxation: objective 1.273417e+04, 1435 iterations, 0.04 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 12734.1739 0 7 16845.0000 12734.1739 24.4% - 0s H 0 0 12743.000000 12734.1739 0.07% - 0s H 0 0 12740.000000 12734.1739 0.05% - 0s 0 0 12735.0000 0 13 12740.0000 12735.0000 0.04% - 0s 0 0 12735.0000 0 8 12740.0000 12735.0000 0.04% - 0s 0 0 12735.1879 0 18 12740.0000 12735.1879 0.04% - 0s 0 0 12735.7946 0 22 12740.0000 12735.7946 0.03% - 0s 0 0 12735.8462 0 23 12740.0000 12735.8462 0.03% - 0s 0 0 12736.1875 0 22 12740.0000 12736.1875 0.03% - 0s 0 0 12736.4023 0 27 12740.0000 12736.4023 0.03% - 0s 0 0 12736.6753 0 28 12740.0000 12736.6753 0.03% - 0s 0 0 12736.8563 0 28 12740.0000 12736.8563 0.02% - 0s 0 0 12736.9674 0 31 12740.0000 12736.9674 0.02% - 0s 0 0 12737.2832 0 30 12740.0000 12737.2832 0.02% - 0s 0 0 12737.3032 0 30 12740.0000 12737.3032 0.02% - 0s 0 0 12737.3061 0 30 12740.0000 12737.3061 0.02% - 0s 0 0 12737.3418 0 29 12740.0000 12737.3418 0.02% - 0s 0 2 12737.3788 0 29 12740.0000 12737.3788 0.02% - 0s Cutting planes: Gomory: 1 Cover: 9 MIR: 33 GUB cover: 1 Explored 46 nodes (2282 simplex iterations) in 0.18 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.274000000000e+04, best bound 1.273900000000e+04, gap 0.0078%