Gurobi 5.0.1 (linux64) logging started Sat Nov 17 23:38:40 2012 Optimize a model with 1 rows, 31 columns and 31 nonzeros Model has 50 quadratic objective terms Presolve time: 0.00s Presolved: 51 rows, 81 columns, 181 nonzeros Variable types: 0 continuous, 81 integer (81 binary) Found heuristic solution: objective 17.0000000 Root relaxation: objective 0.000000e+00, 61 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 19 17.00000 0.00000 100% - 0s H 0 0 16.0000000 0.00000 100% - 0s 0 0 0.00000 0 21 16.00000 0.00000 100% - 0s 0 0 0.00000 0 12 16.00000 0.00000 100% - 0s H 0 0 12.0000000 0.00000 100% - 0s H 0 0 10.0000000 0.00000 100% - 0s 0 0 0.00000 0 16 10.00000 0.00000 100% - 0s 0 0 0.00000 0 16 10.00000 0.00000 100% - 0s 0 2 0.00000 0 16 10.00000 0.00000 100% - 0s * 162 53 9 9.0000000 2.00000 77.8% 5.5 0s * 184 29 6 8.0000000 4.00000 50.0% 7.3 0s Cutting planes: Cover: 90 Explored 216 nodes (1762 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%