Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:13 2012 Optimize a model with 500 rows, 138 columns and 1000 nonzeros Presolve removed 102 rows and 0 columns Presolve time: 0.00s Presolved: 398 rows, 138 columns, 859 nonzeros Variable types: 0 continuous, 138 integer (138 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 5.675000e+01, 221 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 56.75000 0 116 40.00000 56.75000 41.9% - 0s H 0 0 42.0000000 56.75000 35.1% - 0s 0 0 56.00000 0 132 42.00000 56.00000 33.3% - 0s H 0 0 43.0000000 56.00000 30.2% - 0s 0 0 55.07816 0 136 43.00000 55.07816 28.1% - 0s 0 0 54.20721 0 135 43.00000 54.20721 26.1% - 0s H 0 0 44.0000000 54.20721 23.2% - 0s 0 0 53.54795 0 134 44.00000 53.54795 21.7% - 0s 0 0 53.19187 0 132 44.00000 53.19187 20.9% - 0s H 0 0 45.0000000 53.19187 18.2% - 0s 0 0 52.94444 0 132 45.00000 52.94444 17.7% - 0s 0 0 52.86462 0 135 45.00000 52.86462 17.5% - 0s 0 0 52.80051 0 134 45.00000 52.80051 17.3% - 0s 0 0 52.75988 0 134 45.00000 52.75988 17.2% - 0s 0 0 52.75988 0 133 45.00000 52.75988 17.2% - 0s H 0 0 46.0000000 52.75988 14.7% - 0s 0 2 52.75924 0 133 46.00000 52.75924 14.7% - 0s * 23 15 9 47.0000000 52.68263 12.1% 42.5 0s H 51 21 48.0000000 52.13902 8.62% 37.4 0s Cutting planes: Gomory: 1 Zero half: 115 Explored 402 nodes (13110 simplex iterations) in 0.49 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.800000000000e+01, best bound 4.800000000000e+01, gap 0.0%