Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:20:50 2012 Optimize a model with 7349 rows, 2550 columns and 24348 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.13s Presolved: 7397 rows, 2548 columns, 26554 nonzeros Variable types: 0 continuous, 2548 integer (2548 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 2.000000e+00, 1780 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 42.0000000 2.00000 95.2% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 143 4.00000 2.66667 33.3% - 0s 0 0 2.67133 0 2178 4.00000 2.67133 33.2% - 1s 0 0 2.67133 0 2166 4.00000 2.67133 33.2% - 1s 0 0 2.67133 0 2175 4.00000 2.67133 33.2% - 2s 0 0 2.67133 0 1959 4.00000 2.67133 33.2% - 3s 0 0 2.67133 0 1980 4.00000 2.67133 33.2% - 3s 0 0 2.67133 0 1954 4.00000 2.67133 33.2% - 4s 0 0 2.67133 0 1973 4.00000 2.67133 33.2% - 4s 0 0 2.67133 0 1962 4.00000 2.67133 33.2% - 5s 0 0 2.67133 0 1973 4.00000 2.67133 33.2% - 6s 0 0 2.67133 0 1971 4.00000 2.67133 33.2% - 7s 0 0 2.67133 0 1972 4.00000 2.67133 33.2% - 8s 0 0 2.67133 0 1972 4.00000 2.67133 33.2% - 8s 0 2 3.00000 0 1972 4.00000 3.00000 25.0% - 10s Cutting planes: Clique: 68 Zero half: 7 Explored 7 nodes (25681 simplex iterations) in 10.54 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%