Gurobi 5.0.1 (linux64) logging started Mon Feb 4 17:01:14 2013 Optimize a model with 4525 rows, 900 columns and 13950 nonzeros Presolve removed 660 rows and 459 columns Presolve time: 0.04s Presolved: 3865 rows, 441 columns, 11970 nonzeros Variable types: 14 continuous, 427 integer (427 binary) Found heuristic solution: objective 16813.000000 Root relaxation: objective 1.263707e+04, 2051 iterations, 0.05 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 12637.0690 0 7 16813.0000 12637.0690 24.8% - 0s H 0 0 12650.000000 12637.0690 0.10% - 0s H 0 0 12649.000000 12637.0690 0.09% - 0s 0 0 12639.2046 0 18 12649.0000 12639.2046 0.08% - 0s 0 0 12639.2046 0 9 12649.0000 12639.2046 0.08% - 0s 0 0 12640.1740 0 19 12649.0000 12640.1740 0.07% - 0s 0 1 12640.1751 0 19 12649.0000 12640.1751 0.07% - 0s H 6 5 12647.000000 12644.5657 0.02% 0.3 0s H 6 5 12646.000000 12644.5657 0.01% 0.3 0s Cutting planes: Gomory: 8 Cover: 1 Implied bound: 2 Clique: 1 MIR: 15 GUB cover: 1 Zero half: 3 Explored 7 nodes (2314 simplex iterations) in 0.18 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.264600000000e+04, best bound 1.264600000000e+04, gap 0.0%