Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:38 2012 Optimize a model with 452 rows, 130 columns and 904 nonzeros Presolve removed 109 rows and 6 columns Presolve time: 0.00s Presolved: 343 rows, 124 columns, 743 nonzeros Variable types: 0 continuous, 124 integer (124 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 5.450000e+01, 181 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54.50000 0 97 40.00000 54.50000 36.2% - 0s H 0 0 41.0000000 54.50000 32.9% - 0s 0 0 53.34211 0 121 41.00000 53.34211 30.1% - 0s 0 0 53.00000 0 115 41.00000 53.00000 29.3% - 0s 0 0 52.67494 0 119 41.00000 52.67494 28.5% - 0s H 0 0 45.0000000 52.67494 17.1% - 0s 0 0 52.43605 0 123 45.00000 52.43605 16.5% - 0s 0 0 52.23625 0 121 45.00000 52.23625 16.1% - 0s 0 0 51.92572 0 123 45.00000 51.92572 15.4% - 0s 0 0 51.78220 0 123 45.00000 51.78220 15.1% - 0s 0 0 51.68937 0 122 45.00000 51.68937 14.9% - 0s 0 0 51.61194 0 123 45.00000 51.61194 14.7% - 0s 0 0 51.53392 0 123 45.00000 51.53392 14.5% - 0s 0 0 51.44076 0 123 45.00000 51.44076 14.3% - 0s 0 0 51.32927 0 124 45.00000 51.32927 14.1% - 0s 0 0 51.28674 0 124 45.00000 51.28674 14.0% - 0s 0 0 51.28674 0 124 45.00000 51.28674 14.0% - 0s H 0 0 47.0000000 51.28674 9.12% - 0s 0 2 51.28511 0 124 47.00000 51.28511 9.12% - 0s Cutting planes: Gomory: 2 Zero half: 95 Explored 217 nodes (6584 simplex iterations) in 0.27 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%