Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:39 2012 Optimize a model with 400 rows, 130 columns and 800 nonzeros Presolve removed 74 rows and 3 columns Presolve time: 0.00s Presolved: 326 rows, 127 columns, 684 nonzeros Variable types: 0 continuous, 127 integer (127 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 5.700000e+01, 149 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 57.00000 0 108 42.00000 57.00000 35.7% - 0s 0 0 55.50000 0 113 42.00000 55.50000 32.1% - 0s H 0 0 43.0000000 55.50000 29.1% - 0s 0 0 55.16667 0 117 43.00000 55.16667 28.3% - 0s 0 0 54.81250 0 122 43.00000 54.81250 27.5% - 0s H 0 0 46.0000000 54.81250 19.2% - 0s 0 0 54.09375 0 120 46.00000 54.09375 17.6% - 0s 0 0 53.70400 0 123 46.00000 53.70400 16.7% - 0s 0 0 53.45000 0 124 46.00000 53.45000 16.2% - 0s 0 0 52.98434 0 126 46.00000 52.98434 15.2% - 0s 0 0 52.83120 0 125 46.00000 52.83120 14.9% - 0s 0 0 52.56804 0 125 46.00000 52.56804 14.3% - 0s 0 0 52.30605 0 125 46.00000 52.30605 13.7% - 0s 0 0 52.28605 0 123 46.00000 52.28605 13.7% - 0s 0 0 52.23677 0 123 46.00000 52.23677 13.6% - 0s 0 0 52.23677 0 123 46.00000 52.23677 13.6% - 0s H 0 0 48.0000000 52.23677 8.83% - 0s 0 2 52.23445 0 123 48.00000 52.23445 8.82% - 0s Cutting planes: Zero half: 129 Explored 311 nodes (7924 simplex iterations) in 0.28 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%