Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:48:48 2012 Optimize a model with 21023 rows, 5256 columns and 67966 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.67s Presolved: 21093 rows, 5254 columns, 72566 nonzeros Variable types: 0 continuous, 5254 integer (5254 binary) Found heuristic solution: objective 71.0000000 Root relaxation: objective 2.000000e+00, 3930 iterations, 0.16 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 144 71.00000 2.00000 97.2% - 1s H 0 0 6.0000000 2.00000 66.7% - 1s 0 0 3.00000 0 2086 6.00000 3.00000 50.0% - 12s 0 0 3.00000 0 1494 6.00000 3.00000 50.0% - 14s 0 0 3.00000 0 1281 6.00000 3.00000 50.0% - 16s 0 0 3.00000 0 2318 6.00000 3.00000 50.0% - 25s 0 0 3.00000 0 2047 6.00000 3.00000 50.0% - 35s 0 0 3.00000 0 2327 6.00000 3.00000 50.0% - 44s 0 0 3.00000 0 2324 6.00000 3.00000 50.0% - 53s 0 0 3.00000 0 2045 6.00000 3.00000 50.0% - 62s 0 0 3.00000 0 2317 6.00000 3.00000 50.0% - 70s H 0 0 5.0000000 3.00000 40.0% - 70s 0 0 3.00000 0 2315 5.00000 3.00000 40.0% - 79s 0 0 3.00000 0 183 5.00000 3.00000 40.0% - 90s H 0 0 4.0000000 3.00000 25.0% - 91s 0 0 infeasible 0 4.00000 3.00001 25.0% - 99s Cutting planes: Clique: 107 Zero half: 148 Explored 0 nodes (237365 simplex iterations) in 99.78 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%