Gurobi 5.0.1 (linux64) logging started Sun Dec 9 06:10:58 2012 Optimize a model with 570 rows, 540 columns and 1787 nonzeros Presolve removed 32 rows and 19 columns Presolve time: 0.01s Presolved: 538 rows, 521 columns, 1711 nonzeros Variable types: 347 continuous, 174 integer (174 binary) Root relaxation: objective 5.071357e+04, 259 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 50713.5666 0 83 - 50713.5666 - - 0s H 0 0 75854.000000 50713.5666 33.1% - 0s 0 0 58438.9495 0 15 75854.0000 58438.9495 23.0% - 0s 0 0 58545.6942 0 16 75854.0000 58545.6942 22.8% - 0s 0 0 58604.7724 0 9 75854.0000 58604.7724 22.7% - 0s 0 0 58607.8509 0 10 75854.0000 58607.8509 22.7% - 0s H 0 0 75814.000000 58607.8509 22.7% - 0s 0 2 58640.5261 0 10 75814.0000 58640.5261 22.7% - 0s H 23 23 60432.989054 58656.6602 2.94% 2.0 0s * 24 15 22 58841.000000 58656.6602 0.31% 2.0 0s Cutting planes: Gomory: 14 Flow cover: 58 Flow path: 36 Explored 191 nodes (941 simplex iterations) in 0.09 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.884100000000e+04, best bound 5.883752862482e+04, gap 0.0059%