Gurobi 5.0.1 (linux64) logging started Fri Nov 16 08:34:05 2012 Optimize a model with 12991 rows, 4160 columns and 42814 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.41s Presolved: 12989 rows, 4158 columns, 42408 nonzeros Variable types: 0 continuous, 4158 integer (4158 binary) Found heuristic solution: objective 64.0000000 Root relaxation: objective 2.000000e+00, 3150 iterations, 0.12 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 128 64.00000 2.00000 96.9% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 3.00000 0 2069 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 4s 0 0 infeasible 0 4.00000 3.00001 25.0% - 5s Cutting planes: Clique: 87 Zero half: 2 Explored 0 nodes (18992 simplex iterations) in 5.25 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%