Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:14 2012 Optimize a model with 564 rows, 152 columns and 1128 nonzeros Presolve removed 118 rows and 2 columns Presolve time: 0.00s Presolved: 446 rows, 150 columns, 965 nonzeros Variable types: 0 continuous, 150 integer (150 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 6.481818e+01, 279 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.81818 0 144 54.00000 64.81818 20.0% - 0s H 0 0 56.0000000 64.81818 15.7% - 0s 0 0 63.54949 0 147 56.00000 63.54949 13.5% - 0s 0 0 62.50000 0 137 56.00000 62.50000 11.6% - 0s 0 0 62.22340 0 145 56.00000 62.22340 11.1% - 0s 0 0 61.48529 0 147 56.00000 61.48529 9.80% - 0s 0 0 61.09060 0 149 56.00000 61.09060 9.09% - 0s 0 0 60.94474 0 145 56.00000 60.94474 8.83% - 0s H 0 0 57.0000000 60.94474 6.92% - 0s 0 0 60.83286 0 147 57.00000 60.83286 6.72% - 0s 0 0 60.81042 0 146 57.00000 60.81042 6.68% - 0s 0 0 60.72529 0 147 57.00000 60.72529 6.54% - 0s H 0 0 58.0000000 60.72529 4.70% - 0s 0 0 60.71125 0 147 58.00000 60.71125 4.67% - 0s 0 0 60.71125 0 146 58.00000 60.71125 4.67% - 0s 0 2 60.70843 0 146 58.00000 60.70843 4.67% - 0s H 3 3 59.0000000 60.69403 2.87% 36.3 0s Cutting planes: Zero half: 56 Explored 24 nodes (1746 simplex iterations) in 0.14 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%