Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:28:21 2012 Optimize a model with 7088 rows, 2652 columns and 23662 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.13s Presolved: 7137 rows, 2650 columns, 25985 nonzeros Variable types: 0 continuous, 2650 integer (2650 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 2.000000e+00, 2061 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 0 102 51.00000 2.00000 96.1% - 0s H 0 0 49.0000000 2.00000 95.9% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 2272 5.00000 2.66667 46.7% - 0s H 0 0 4.0000000 2.66667 33.3% - 1s 0 0 2.67586 0 2315 4.00000 2.67586 33.1% - 1s 0 0 2.67586 0 2309 4.00000 2.67586 33.1% - 2s 0 0 2.67586 0 2296 4.00000 2.67586 33.1% - 2s 0 0 2.67586 0 2304 4.00000 2.67586 33.1% - 3s 0 0 2.67586 0 1886 4.00000 2.67586 33.1% - 4s 0 0 2.67586 0 1987 4.00000 2.67586 33.1% - 5s 0 0 2.67586 0 1963 4.00000 2.67586 33.1% - 6s 0 0 2.67586 0 1935 4.00000 2.67586 33.1% - 7s 0 0 2.67586 0 1954 4.00000 2.67586 33.1% - 8s 0 0 2.67586 0 1948 4.00000 2.67586 33.1% - 8s 0 0 2.67586 0 2049 4.00000 2.67586 33.1% - 9s 0 0 2.67586 0 2049 4.00000 2.67586 33.1% - 10s 0 1 3.00000 0 2049 4.00000 3.00000 25.0% - 12s Cutting planes: Clique: 89 Zero half: 4 Explored 6 nodes (32720 simplex iterations) in 12.69 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%