Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:42:21 2012 Optimize a model with 635 rows, 159 columns and 1270 nonzeros Presolve removed 121 rows and 0 columns Presolve time: 0.00s Presolved: 514 rows, 159 columns, 1103 nonzeros Variable types: 0 continuous, 159 integer (159 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 6.750000e+01, 239 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.50000 0 127 51.00000 67.50000 32.4% - 0s H 0 0 52.0000000 67.50000 29.8% - 0s 0 0 65.60000 0 155 52.00000 65.60000 26.2% - 0s H 0 0 55.0000000 65.60000 19.3% - 0s 0 0 64.93393 0 157 55.00000 64.93393 18.1% - 0s H 0 0 56.0000000 64.93393 16.0% - 0s 0 0 64.17366 0 158 56.00000 64.17366 14.6% - 0s 0 0 63.37592 0 157 56.00000 63.37592 13.2% - 0s 0 0 62.97754 0 157 56.00000 62.97754 12.5% - 0s H 0 0 57.0000000 62.97754 10.5% - 0s 0 0 62.61195 0 157 57.00000 62.61195 9.85% - 0s 0 0 62.44737 0 157 57.00000 62.44737 9.56% - 0s 0 0 62.44737 0 157 57.00000 62.44737 9.56% - 0s 0 0 62.44737 0 156 57.00000 62.44737 9.56% - 0s H 0 0 58.0000000 62.44737 7.67% - 0s 0 2 62.44737 0 156 58.00000 62.44737 7.67% - 0s H 73 20 59.0000000 61.48467 4.21% 47.4 0s Cutting planes: Gomory: 2 Zero half: 97 Explored 126 nodes (6545 simplex iterations) in 0.34 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%