Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:45:10 2012 Optimize a model with 7747 rows, 2756 columns and 25738 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.15s Presolved: 7797 rows, 2754 columns, 28144 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 2.000000e+00, 1988 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 0 104 50.00000 2.00000 96.0% - 0s H 0 0 47.0000000 2.00000 95.7% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 810 5.00000 2.66667 46.7% - 0s 0 0 2.66667 0 2203 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 141 5.00000 2.66667 46.7% - 4s H 0 0 4.0000000 2.66667 33.3% - 5s 0 0 2.67114 0 1937 4.00000 2.67114 33.2% - 7s 0 0 2.67114 0 1939 4.00000 2.67114 33.2% - 7s 0 0 2.67114 0 1761 4.00000 2.67114 33.2% - 9s 0 0 2.67114 0 1984 4.00000 2.67114 33.2% - 11s 0 0 2.67114 0 1889 4.00000 2.67114 33.2% - 13s 0 0 2.67114 0 2062 4.00000 2.67114 33.2% - 15s 0 0 2.67114 0 2023 4.00000 2.67114 33.2% - 17s 0 0 2.67114 0 2012 4.00000 2.67114 33.2% - 19s 0 0 2.67114 0 2011 4.00000 2.67114 33.2% - 21s 0 0 2.67114 0 2001 4.00000 2.67114 33.2% - 23s 0 0 2.67114 0 2035 4.00000 2.67114 33.2% - 24s 0 0 2.67114 0 2082 4.00000 2.67114 33.2% - 26s 0 0 2.67114 0 2082 4.00000 2.67114 33.2% - 27s 0 2 2.80000 0 2078 4.00000 2.80000 30.0% - 32s Cutting planes: Clique: 50 Zero half: 10 Explored 13 nodes (116246 simplex iterations) in 33.85 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%