Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:44:21 2012 Optimize a model with 644 rows, 161 columns and 1288 nonzeros Presolve removed 125 rows and 0 columns Presolve time: 0.00s Presolved: 519 rows, 161 columns, 1118 nonzeros Variable types: 0 continuous, 161 integer (161 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 6.533333e+01, 317 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 65.33333 0 147 51.00000 65.33333 28.1% - 0s 0 0 63.70612 0 159 51.00000 63.70612 24.9% - 0s H 0 0 53.0000000 63.70612 20.2% - 0s 0 0 63.33333 0 159 53.00000 63.33333 19.5% - 0s 0 0 63.01467 0 160 53.00000 63.01467 18.9% - 0s 0 0 62.85984 0 161 53.00000 62.85984 18.6% - 0s 0 0 62.68705 0 160 53.00000 62.68705 18.3% - 0s 0 0 62.61056 0 161 53.00000 62.61056 18.1% - 0s 0 0 62.50059 0 161 53.00000 62.50059 17.9% - 0s 0 0 62.26773 0 160 53.00000 62.26773 17.5% - 0s 0 0 62.19585 0 161 53.00000 62.19585 17.4% - 0s 0 0 62.11662 0 160 53.00000 62.11662 17.2% - 0s 0 0 62.09160 0 160 53.00000 62.09160 17.2% - 0s 0 0 62.09160 0 160 53.00000 62.09160 17.2% - 0s 0 2 62.08403 0 160 53.00000 62.08403 17.1% - 0s H 11 11 54.0000000 62.08403 15.0% 64.3 0s H 12 12 55.0000000 62.08403 12.9% 63.7 0s * 51 18 8 56.0000000 61.40738 9.66% 46.9 0s Cutting planes: Gomory: 3 Zero half: 116 Explored 661 nodes (24346 simplex iterations) in 0.98 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%