Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:43 2012 Optimize a model with 250 rows, 69 columns and 500 nonzeros Presolve removed 72 rows and 0 columns Presolve time: 0.00s Presolved: 178 rows, 69 columns, 412 nonzeros Variable types: 0 continuous, 69 integer (69 binary) Found heuristic solution: objective 21.0000000 Root relaxation: objective 2.687097e+01, 123 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 26.87097 0 67 21.00000 26.87097 28.0% - 0s H 0 0 22.0000000 26.87097 22.1% - 0s H 0 0 23.0000000 26.87097 16.8% - 0s 0 0 26.31183 0 66 23.00000 26.31183 14.4% - 0s 0 0 26.00000 0 63 23.00000 26.00000 13.0% - 0s 0 0 25.94828 0 66 23.00000 25.94828 12.8% - 0s 0 0 25.71329 0 64 23.00000 25.71329 11.8% - 0s 0 0 25.63218 0 67 23.00000 25.63218 11.4% - 0s 0 0 25.62579 0 66 23.00000 25.62579 11.4% - 0s 0 0 25.61902 0 66 23.00000 25.61902 11.4% - 0s 0 0 25.61902 0 66 23.00000 25.61902 11.4% - 0s H 0 0 24.0000000 25.61902 6.75% - 0s 0 2 25.61902 0 66 24.00000 25.61902 6.75% - 0s * 17 1 4 25.0000000 25.08333 0.33% 15.2 0s Cutting planes: Gomory: 1 Zero half: 24 Explored 18 nodes (584 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0%