Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:42 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 4.013975e+04, 456 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 40139.7487 0 4 - 40139.7487 - - 0s 0 0 40145.0626 0 4 - 40145.0626 - - 0s 0 0 40148.4236 0 4 - 40148.4236 - - 0s 0 0 40149.3074 0 8 - 40149.3074 - - 0s 0 0 40150.0992 0 5 - 40150.0992 - - 0s 0 0 40151.2932 0 4 - 40151.2932 - - 0s 0 0 40151.4916 0 8 - 40151.4916 - - 0s 0 0 40152.2928 0 6 - 40152.2928 - - 0s 0 0 40152.3488 0 6 - 40152.3488 - - 0s 0 0 40152.8468 0 9 - 40152.8468 - - 0s 0 0 40153.0002 0 4 - 40153.0002 - - 0s 0 0 40153.0320 0 10 - 40153.0320 - - 0s 0 0 40153.8493 0 10 - 40153.8493 - - 0s 0 0 40154.0229 0 13 - 40154.0229 - - 1s 0 0 40154.2711 0 10 - 40154.2711 - - 1s 0 0 40154.3444 0 13 - 40154.3444 - - 1s 0 0 40154.3647 0 10 - 40154.3647 - - 1s 0 0 40154.3949 0 13 - 40154.3949 - - 1s 0 0 40154.3949 0 13 - 40154.3949 - - 1s 0 2 40154.3949 0 13 - 40154.3949 - - 2s * 36 6 18 40195.185018 40195.1850 0.0% 37.8 3s Cutting planes: Gomory: 3 Implied bound: 53 Flow cover: 4 Explored 37 nodes (2510 simplex iterations) in 3.08 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.019518501810e+04, best bound 4.019518501810e+04, gap 0.0%