Gurobi 5.0.1 (linux64) logging started Mon Feb 4 19:01:27 2013 Optimize a model with 47971 rows, 4356 columns and 145926 nonzeros Presolve removed 4966 rows and 2231 columns Presolve time: 0.35s Presolved: 43005 rows, 2125 columns, 130588 nonzeros Variable types: 25 continuous, 2100 integer (2100 binary) Found heuristic solution: objective 86538.000000 Root relaxation: objective 6.484415e+04, 13331 iterations, 1.19 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64844.1538 0 13 86538.0000 64844.1538 25.1% - 1s H 0 0 64858.000000 64844.1538 0.02% - 1s H 0 0 64853.000000 64844.1538 0.01% - 1s 0 0 64845.0190 0 20 64853.0000 64845.0190 0.01% - 1s 0 0 64845.0190 0 12 64853.0000 64845.0190 0.01% - 2s H 0 0 64852.000000 64845.0190 0.01% - 2s 0 0 64845.0190 0 18 64852.0000 64845.0190 0.01% - 2s 0 2 64845.0667 0 17 64852.0000 64845.0667 0.01% - 2s H 10 7 64850.000000 64845.0968 0.01% 2.2 2s Cutting planes: Gomory: 1 MIR: 8 Zero half: 2 Explored 10 nodes (16345 simplex iterations) in 2.37 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.485000000000e+04, best bound 6.484600000000e+04, gap 0.0062%