Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:43:23 2012 Optimize a model with 830 rows, 183 columns and 1660 nonzeros Presolve removed 185 rows and 0 columns Presolve time: 0.01s Presolved: 645 rows, 183 columns, 1416 nonzeros Variable types: 0 continuous, 183 integer (183 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 7.375000e+01, 362 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 73.75000 0 145 54.00000 73.75000 36.6% - 0s 0 0 72.58824 0 181 54.00000 72.58824 34.4% - 0s 0 0 71.07184 0 178 54.00000 71.07184 31.6% - 0s 0 0 70.08526 0 179 54.00000 70.08526 29.8% - 0s 0 0 69.54149 0 180 54.00000 69.54149 28.8% - 0s 0 0 69.22740 0 182 54.00000 69.22740 28.2% - 0s 0 0 68.91271 0 181 54.00000 68.91271 27.6% - 0s H 0 0 56.0000000 68.91271 23.1% - 0s 0 0 68.66718 0 182 56.00000 68.66718 22.6% - 0s 0 0 68.45768 0 183 56.00000 68.45768 22.2% - 0s 0 0 68.32072 0 181 56.00000 68.32072 22.0% - 0s 0 0 68.29285 0 183 56.00000 68.29285 22.0% - 0s 0 0 68.29285 0 181 56.00000 68.29285 22.0% - 0s 0 2 68.29257 0 181 56.00000 68.29257 22.0% - 0s * 91 58 16 57.0000000 67.88172 19.1% 52.9 0s H 219 83 59.0000000 66.69404 13.0% 48.3 0s 613 258 61.35000 11 182 59.00000 65.46205 11.0% 49.6 5s 2268 811 60.22222 30 125 59.00000 64.30488 8.99% 46.0 10s 5720 1534 60.72308 25 134 59.00000 62.69912 6.27% 36.4 15s 9720 1331 cutoff 32 59.00000 61.62500 4.45% 32.3 20s Cutting planes: Gomory: 8 Zero half: 69 Mod-K: 1 Explored 12914 nodes (387865 simplex iterations) in 23.22 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.900000000000e+01, best bound 5.900000000000e+01, gap 0.0%