Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:44:45 2012 Optimize a model with 1671 rows, 81 columns and 3342 nonzeros Presolve removed 1172 rows and 0 columns Presolve time: 0.05s Presolved: 499 rows, 81 columns, 3326 nonzeros Variable types: 0 continuous, 81 integer (81 binary) Found heuristic solution: objective 6.0000000 Root relaxation: objective 1.176780e+01, 311 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 11.76780 0 77 6.00000 11.76780 96.1% - 0s H 0 0 7.0000000 11.76780 68.1% - 0s 0 0 11.47795 0 81 7.00000 11.47795 64.0% - 0s H 0 0 8.0000000 11.47795 43.5% - 0s 0 0 11.43121 0 81 8.00000 11.43121 42.9% - 0s 0 0 11.40307 0 81 8.00000 11.40307 42.5% - 0s 0 0 11.39030 0 81 8.00000 11.39030 42.4% - 0s 0 0 11.38320 0 81 8.00000 11.38320 42.3% - 0s 0 0 11.37547 0 81 8.00000 11.37547 42.2% - 0s 0 0 11.37272 0 81 8.00000 11.37272 42.2% - 0s 0 0 11.36952 0 81 8.00000 11.36952 42.1% - 0s 0 0 11.36866 0 81 8.00000 11.36866 42.1% - 0s 0 0 11.36788 0 81 8.00000 11.36788 42.1% - 0s 0 2 11.36739 0 81 8.00000 11.36739 42.1% - 0s Cutting planes: Clique: 43 Zero half: 6 Explored 64 nodes (3965 simplex iterations) in 0.66 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%