Gurobi 5.0.1 (linux64) logging started Mon Feb 4 16:32:03 2013 Optimize a model with 1331 rows, 28926 columns and 1484707 nonzeros Presolve removed 57 rows and 316 columns (presolve time = 5s) ... Presolve removed 64 rows and 427 columns Presolve time: 7.98s Presolved: 1267 rows, 28499 columns, 1457785 nonzeros Variable types: 0 continuous, 28499 integer (28499 binary) Found heuristic solution: objective 17363.000000 Root relaxation: objective 1.163900e+04, 7844 iterations, 4.32 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 11639.0000 0 142 17363.0000 11639.0000 33.0% - 13s H 0 0 14174.000000 11639.0000 17.9% - 14s H 0 0 13891.000000 11639.0000 16.2% - 15s H 0 0 12763.000000 11639.0000 8.81% - 15s 0 0 11655.5000 0 263 12763.0000 11655.5000 8.68% - 19s * 0 0 0 11674.000000 11674.0000 0.0% - 25s Cutting planes: Clique: 47 Zero half: 8 Explored 0 nodes (10590 simplex iterations) in 25.14 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.167400000000e+04, best bound 1.167400000000e+04, gap 0.0000%