Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:05 2012 Optimize a model with 457 rows, 136 columns and 914 nonzeros Presolve removed 94 rows and 3 columns Presolve time: 0.00s Presolved: 363 rows, 133 columns, 775 nonzeros Variable types: 0 continuous, 133 integer (133 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 5.825000e+01, 205 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.25000 0 110 47.00000 58.25000 23.9% - 0s 0 0 56.80000 0 121 47.00000 56.80000 20.9% - 0s H 0 0 49.0000000 56.80000 15.9% - 0s 0 0 56.00000 0 126 49.00000 56.00000 14.3% - 0s H 0 0 50.0000000 56.00000 12.0% - 0s 0 0 55.28161 0 128 50.00000 55.28161 10.6% - 0s 0 0 54.90909 0 127 50.00000 54.90909 9.82% - 0s 0 0 54.73488 0 128 50.00000 54.73488 9.47% - 0s 0 0 54.50904 0 129 50.00000 54.50904 9.02% - 0s 0 0 54.47500 0 131 50.00000 54.47500 8.95% - 0s 0 0 54.44239 0 129 50.00000 54.44239 8.88% - 0s 0 0 54.37931 0 129 50.00000 54.37931 8.76% - 0s 0 0 54.32433 0 132 50.00000 54.32433 8.65% - 0s 0 0 54.27652 0 132 50.00000 54.27652 8.55% - 0s 0 0 54.26507 0 132 50.00000 54.26507 8.53% - 0s 0 0 54.26507 0 129 50.00000 54.26507 8.53% - 0s 0 2 54.26486 0 129 50.00000 54.26486 8.53% - 0s H 28 4 51.0000000 54.19758 6.27% 31.0 0s Cutting planes: Zero half: 82 Explored 81 nodes (3377 simplex iterations) in 0.17 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%