Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:25 2012 Optimize a model with 491 rows, 140 columns and 982 nonzeros Presolve removed 100 rows and 0 columns Presolve time: 0.00s Presolved: 391 rows, 140 columns, 846 nonzeros Variable types: 0 continuous, 140 integer (140 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 5.850000e+01, 249 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.50000 0 121 47.00000 58.50000 24.5% - 0s 0 0 57.77778 0 131 47.00000 57.77778 22.9% - 0s H 0 0 51.0000000 57.77778 13.3% - 0s 0 0 56.90698 0 136 51.00000 56.90698 11.6% - 0s 0 0 56.28889 0 137 51.00000 56.28889 10.4% - 0s 0 0 56.01724 0 138 51.00000 56.01724 9.84% - 0s 0 0 55.79878 0 139 51.00000 55.79878 9.41% - 0s 0 0 55.54545 0 134 51.00000 55.54545 8.91% - 0s 0 0 55.34682 0 138 51.00000 55.34682 8.52% - 0s 0 0 55.22116 0 139 51.00000 55.22116 8.28% - 0s 0 0 55.10543 0 138 51.00000 55.10543 8.05% - 0s 0 0 55.09030 0 138 51.00000 55.09030 8.02% - 0s 0 0 55.09030 0 138 51.00000 55.09030 8.02% - 0s H 0 0 52.0000000 55.09030 5.94% - 0s 0 2 55.08937 0 138 52.00000 55.08937 5.94% - 0s Cutting planes: Gomory: 1 Zero half: 85 Explored 53 nodes (2970 simplex iterations) in 0.17 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%