Gurobi 5.0.1 (linux64) logging started Mon Feb 4 16:37:45 2013 Optimize a model with 1153 rows, 25967 columns and 1081164 nonzeros Presolve removed 40 rows and 195 columns Presolve time: 3.62s Presolved: 1113 rows, 25772 columns, 1072062 nonzeros Variable types: 0 continuous, 25772 integer (25772 binary) Found heuristic solution: objective 13372.000000 Root relaxation: objective 8.475000e+03, 6709 iterations, 3.31 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 8475.00000 0 72 13372.0000 8475.00000 36.6% - 7s H 0 0 9452.0000000 8475.00000 10.3% - 8s H 0 0 9366.0000000 8475.00000 9.51% - 10s H 0 0 9325.0000000 8475.00000 9.12% - 11s 0 0 8501.66667 0 64 9325.00000 8501.66667 8.83% - 12s * 0 0 0 8505.0000000 8505.00000 0.0% - 14s Cutting planes: Clique: 9 Zero half: 40 Explored 0 nodes (8773 simplex iterations) in 14.53 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.505000000000e+03, best bound 8.505000000000e+03, gap 0.0%