Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:45:12 2013 Optimize a model with 55574 rows, 54834 columns and 219114 nonzeros Presolve removed 3054 rows and 0 columns Presolve time: 0.33s Presolved: 52520 rows, 54834 columns, 213006 nonzeros Variable types: 54760 continuous, 74 integer (74 binary) Root relaxation: objective 7.813405e+04, 10595 iterations, 1.92 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 78134.0513 0 4 - 78134.0513 - - 2s H 0 0 79980.000000 78134.0513 2.31% - 2s H 0 0 78665.000000 78134.0513 0.67% - 2s 0 0 78138.6454 0 5 78665.0000 78138.6454 0.67% - 3s 0 0 78138.8991 0 5 78665.0000 78138.8991 0.67% - 3s 0 0 78138.9969 0 5 78665.0000 78138.9969 0.67% - 3s 0 0 78138.9969 0 5 78665.0000 78138.9969 0.67% - 4s 0 0 78138.9969 0 4 78665.0000 78138.9969 0.67% - 4s 0 0 78138.9969 0 4 78665.0000 78138.9969 0.67% - 7s 0 0 78138.9969 0 4 78665.0000 78138.9969 0.67% - 7s 0 0 78138.9969 0 4 78665.0000 78138.9969 0.67% - 7s 0 2 78140.3439 0 4 78665.0000 78140.3439 0.67% - 8s H 8 8 78645.000000 78228.1186 0.53% 113 9s * 9 8 8 78411.000000 78228.1186 0.23% 122 9s Cutting planes: Gomory: 2 Flow cover: 10 Explored 25 nodes (17728 simplex iterations) in 9.66 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.841100000000e+04, best bound 7.841100000000e+04, gap 0.0%