Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:20:44 2012 Optimize a model with 7649 rows, 2550 columns and 25248 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.14s Presolved: 7647 rows, 2548 columns, 24942 nonzeros Variable types: 0 continuous, 2548 integer (2548 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 2.000000e+00, 1860 iterations, 0.05 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 100 50.00000 2.00000 96.0% - 0s H 0 0 41.0000000 2.00000 95.1% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 3.00000 0 1416 5.00000 3.00000 40.0% - 0s 0 0 3.00000 0 1688 5.00000 3.00000 40.0% - 1s 0 0 3.00000 0 72 5.00000 3.00000 40.0% - 6s H 0 0 4.0000000 3.00000 25.0% - 6s 0 0 infeasible 0 4.00000 3.00001 25.0% - 6s Cutting planes: Clique: 32 Zero half: 34 Mod-K: 1 Explored 0 nodes (31493 simplex iterations) in 6.55 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%