Gurobi 5.0.1 (linux64) logging started Fri Nov 16 21:55:00 2012 Optimize a model with 31855 rows, 32942 columns and 127603 nonzeros Presolve removed 29 rows and 4889 columns Presolve time: 0.69s Presolved: 31826 rows, 28053 columns, 122364 nonzeros Variable types: 0 continuous, 28053 integer (28053 binary) Found heuristic solution: objective 181.0000000 Root relaxation: objective 2.000000e+00, 20031 iterations, 1.36 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 274 181.00000 2.00000 98.9% - 4s H 0 0 178.0000000 2.00000 98.9% - 4s H 0 0 4.0000000 2.00000 50.0% - 4s 0 0 2.20000 0 455 4.00000 2.20000 45.0% - 19s H 0 0 3.0000000 2.20000 26.7% - 19s Cutting planes: Zero half: 8 Explored 0 nodes (85919 simplex iterations) in 19.54 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 3.000000000000e+00, gap 0.0%