Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:12 2012 Optimize a model with 304 rows, 36 columns and 608 nonzeros Presolve removed 212 rows and 0 columns Presolve time: 0.00s Presolved: 92 rows, 36 columns, 442 nonzeros Variable types: 0 continuous, 36 integer (36 binary) Found heuristic solution: objective 5.0000000 Root relaxation: objective 7.666667e+00, 50 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 7.66667 0 27 5.00000 7.66667 53.3% - 0s H 0 0 6.0000000 7.66667 27.8% - 0s 0 0 7.33102 0 35 6.00000 7.33102 22.2% - 0s 0 0 7.22727 0 30 6.00000 7.22727 20.5% - 0s 0 0 7.18213 0 33 6.00000 7.18213 19.7% - 0s 0 0 7.15152 0 30 6.00000 7.15152 19.2% - 0s 0 0 7.14943 0 32 6.00000 7.14943 19.2% - 0s 0 0 7.14943 0 31 6.00000 7.14943 19.2% - 0s 0 2 7.13139 0 31 6.00000 7.13139 18.9% - 0s Cutting planes: Clique: 9 Zero half: 5 Explored 4 nodes (173 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+00, best bound 6.000000000000e+00, gap 0.0%