Gurobi 5.0.1 (linux64) logging started Mon Feb 4 16:26:38 2013 Optimize a model with 967 rows, 18952 columns and 731716 nonzeros Presolve removed 14 rows and 29 columns (presolve time = 5s) ... Presolve removed 14 rows and 29 columns Presolve time: 5.06s Presolved: 953 rows, 18923 columns, 730115 nonzeros Variable types: 0 continuous, 18923 integer (18923 binary) Found heuristic solution: objective 9586.0000000 Root relaxation: objective 6.162307e+03, 3740 iterations, 1.27 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 6162.30667 0 109 9586.00000 6162.30667 35.7% - 6s H 0 0 6181.0000000 6162.30667 0.30% - 7s * 0 0 0 6166.0000000 6166.00000 0.0% - 8s Cutting planes: Clique: 15 Zero half: 34 Explored 0 nodes (4042 simplex iterations) in 8.26 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.166000000000e+03, best bound 6.166000000000e+03, gap 0.0%