Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:40:31 2012 Optimize a model with 1 rows, 172 columns and 172 nonzeros Model has 170 quadratic objective terms Presolve removed 0 rows and 27 columns Presolve time: 0.00s Presolved: 171 rows, 315 columns, 655 nonzeros Variable types: 0 continuous, 315 integer (314 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 0.000000e+00, 215 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 51 51.00000 0.00000 100% - 0s 0 0 0.00000 0 33 51.00000 0.00000 100% - 0s H 0 0 32.0000000 0.00000 100% - 0s H 0 0 31.0000000 0.00000 100% - 0s 0 0 0.00000 0 52 31.00000 0.00000 100% - 0s 0 0 0.00000 0 27 31.00000 0.00000 100% - 0s H 0 0 23.0000000 0.00000 100% - 0s 0 0 0.00000 0 38 23.00000 0.00000 100% - 0s 0 0 0.00000 0 20 23.00000 0.00000 100% - 0s H 0 0 18.0000000 0.00000 100% - 0s H 0 0 15.0000000 0.00000 100% - 0s 0 2 0.00000 0 20 15.00000 0.00000 100% - 0s H 108 80 13.0000000 0.00000 100% 2.4 0s H 352 230 11.0000000 0.00000 100% 10.3 0s * 504 280 19 10.0000000 0.00000 100% 11.7 0s H 514 259 9.0000000 0.00000 100% 12.4 0s 40805 28270 7.00000 69 20 9.00000 1.00000 88.9% 1.5 7s H40895 26896 8.0000000 1.72175 78.5% 1.8 9s 40914 26902 6.09621 52 56 8.00000 1.72175 78.5% 1.8 10s Cutting planes: Gomory: 70 Cover: 190 MIR: 114 Flow cover: 144 Zero half: 315 Explored 41280 nodes (94953 simplex iterations) in 12.19 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%