Gurobi 5.0.1 (linux64) logging started Mon Feb 4 16:00:57 2013 Optimize a model with 311 rows, 1638 columns and 51637 nonzeros Presolve removed 19 rows and 14 columns Presolve time: 0.38s Presolved: 292 rows, 1624 columns, 50594 nonzeros Variable types: 0 continuous, 1624 integer (1624 binary) Found heuristic solution: objective 1033.0000000 Root relaxation: objective 8.640000e+02, 322 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 864.00000 0 14 1033.00000 864.00000 16.4% - 0s H 0 0 991.0000000 864.00000 12.8% - 0s 0 0 880.50000 0 12 991.00000 880.50000 11.2% - 0s H 0 0 900.0000000 880.50000 2.17% - 0s H 0 0 887.0000000 880.50000 0.73% - 0s * 0 0 0 881.0000000 881.00000 0.0% - 0s Cutting planes: Clique: 3 Zero half: 3 Explored 0 nodes (556 simplex iterations) in 0.51 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.810000000000e+02, best bound 8.810000000000e+02, gap 0.0%