Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:38 2013 Optimize a model with 4320 rows, 12060 columns and 36100 nonzeros Presolve removed 20 rows and 20 columns Presolve time: 0.18s Presolved: 4300 rows, 12040 columns, 32080 nonzeros Variable types: 8040 continuous, 4000 integer (4000 binary) Root relaxation: objective 3.709539e+04, 459 iterations, 0.03 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 37095.3933 0 8 - 37095.3933 - - 0s 0 0 37122.6820 0 4 - 37122.6820 - - 0s 0 0 37130.2721 0 5 - 37130.2721 - - 0s 0 0 37132.0600 0 6 - 37132.0600 - - 0s 0 0 37135.8150 0 5 - 37135.8150 - - 0s 0 0 37138.3958 0 7 - 37138.3958 - - 0s 0 0 37140.2817 0 5 - 37140.2817 - - 0s 0 0 37140.7109 0 5 - 37140.7109 - - 0s 0 0 37140.7850 0 7 - 37140.7850 - - 0s 0 0 37142.0262 0 5 - 37142.0262 - - 0s 0 0 37142.2069 0 8 - 37142.2069 - - 0s 0 0 37142.5984 0 8 - 37142.5984 - - 0s 0 0 37142.7627 0 10 - 37142.7627 - - 0s 0 0 37142.9235 0 10 - 37142.9235 - - 0s 0 0 37143.3661 0 10 - 37143.3661 - - 0s 0 0 37143.5224 0 10 - 37143.5224 - - 1s 0 0 37143.5606 0 5 - 37143.5606 - - 1s 0 0 37143.5802 0 11 - 37143.5802 - - 1s 0 0 37143.5802 0 11 - 37143.5802 - - 1s 0 2 37143.5802 0 11 - 37143.5802 - - 2s * 14 6 7 37269.725700 37252.7062 0.05% 40.4 2s * 23 6 12 37253.494793 37252.7062 0.00% 26.4 2s Cutting planes: Gomory: 2 Implied bound: 29 Flow cover: 5 Explored 24 nodes (1528 simplex iterations) in 2.31 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.725349479311e+04, best bound 3.725270623004e+04, gap 0.0021%