Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:35 2012 Optimize a model with 573 rows, 110 columns and 1146 nonzeros Presolve removed 211 rows and 0 columns Presolve time: 0.00s Presolved: 362 rows, 110 columns, 902 nonzeros Variable types: 0 continuous, 110 integer (110 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.927559e+01, 248 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 39.27559 0 107 26.00000 39.27559 51.1% - 0s H 0 0 29.0000000 39.27559 35.4% - 0s 0 0 38.68293 0 108 29.00000 38.68293 33.4% - 0s 0 0 38.47636 0 108 29.00000 38.47636 32.7% - 0s 0 0 38.34581 0 109 29.00000 38.34581 32.2% - 0s H 0 0 30.0000000 38.34581 27.8% - 0s 0 0 38.10327 0 107 30.00000 38.10327 27.0% - 0s H 0 0 31.0000000 38.10327 22.9% - 0s 0 0 37.87148 0 108 31.00000 37.87148 22.2% - 0s 0 0 37.76049 0 109 31.00000 37.76049 21.8% - 0s 0 0 37.73586 0 109 31.00000 37.73586 21.7% - 0s 0 0 37.60295 0 108 31.00000 37.60295 21.3% - 0s 0 0 37.53729 0 109 31.00000 37.53729 21.1% - 0s 0 0 37.41916 0 109 31.00000 37.41916 20.7% - 0s 0 0 37.33807 0 108 31.00000 37.33807 20.4% - 0s 0 0 37.32360 0 108 31.00000 37.32360 20.4% - 0s 0 0 37.32360 0 108 31.00000 37.32360 20.4% - 0s 0 2 37.32281 0 108 31.00000 37.32281 20.4% - 0s * 10 10 8 32.0000000 37.32281 16.6% 35.8 0s * 29 18 12 33.0000000 37.21142 12.8% 30.2 0s Cutting planes: Zero half: 57 Explored 250 nodes (7431 simplex iterations) in 0.34 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.300000000000e+01, best bound 3.300000000000e+01, gap 0.0%