Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:27:56 2012 Optimize a model with 7853 rows, 2652 columns and 25957 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.14s Presolved: 7902 rows, 2650 columns, 28250 nonzeros Variable types: 0 continuous, 2650 integer (2650 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 2.000000e+00, 1954 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 50.0000000 2.00000 96.0% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 135 5.00000 2.66667 46.7% - 1s 0 0 2.67123 0 2416 5.00000 2.67123 46.6% - 1s 0 0 2.67123 0 2435 5.00000 2.67123 46.6% - 2s 0 0 2.67123 0 2044 5.00000 2.67123 46.6% - 3s 0 0 2.67123 0 2027 5.00000 2.67123 46.6% - 4s 0 0 2.67123 0 2051 5.00000 2.67123 46.6% - 5s 0 0 2.67123 0 2005 5.00000 2.67123 46.6% - 5s 0 0 2.67123 0 2006 5.00000 2.67123 46.6% - 6s 0 0 2.67123 0 2001 5.00000 2.67123 46.6% - 7s 0 0 2.67123 0 1952 5.00000 2.67123 46.6% - 8s 0 0 2.67123 0 1961 5.00000 2.67123 46.6% - 8s 0 0 2.67123 0 1958 5.00000 2.67123 46.6% - 9s 0 0 2.67123 0 1958 5.00000 2.67123 46.6% - 10s 0 0 2.67123 0 1958 5.00000 2.67123 46.6% - 10s 0 2 3.00000 0 1958 5.00000 3.00000 40.0% - 12s * 20 4 12 4.0000000 4.00000 0.0% 289 13s Cutting planes: Clique: 57 Zero half: 6 Explored 21 nodes (37817 simplex iterations) in 13.60 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%