Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:52:44 2012 Optimize a model with 679 rows, 117 columns and 1358 nonzeros Presolve removed 257 rows and 0 columns Presolve time: 0.00s Presolved: 422 rows, 117 columns, 1061 nonzeros Variable types: 0 continuous, 117 integer (117 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 4.033893e+01, 298 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 40.33893 0 117 25.00000 40.33893 61.4% - 0s H 0 0 26.0000000 40.33893 55.1% - 0s H 0 0 27.0000000 40.33893 49.4% - 0s H 0 0 28.0000000 40.33893 44.1% - 0s 0 0 39.94792 0 117 28.00000 39.94792 42.7% - 0s 0 0 39.78416 0 116 28.00000 39.78416 42.1% - 0s 0 0 39.55250 0 117 28.00000 39.55250 41.3% - 0s 0 0 39.45196 0 115 28.00000 39.45196 40.9% - 0s H 0 0 30.0000000 39.45196 31.5% - 0s 0 0 39.32241 0 116 30.00000 39.32241 31.1% - 0s 0 0 39.23922 0 117 30.00000 39.23922 30.8% - 0s 0 0 39.14210 0 116 30.00000 39.14210 30.5% - 0s 0 0 39.03549 0 116 30.00000 39.03549 30.1% - 0s 0 0 39.01284 0 116 30.00000 39.01284 30.0% - 0s 0 0 38.98063 0 116 30.00000 38.98063 29.9% - 0s 0 0 38.96932 0 116 30.00000 38.96932 29.9% - 0s 0 0 38.96932 0 116 30.00000 38.96932 29.9% - 0s 0 2 38.96196 0 116 30.00000 38.96196 29.9% - 0s H 27 14 31.0000000 38.96196 25.7% 25.7 0s * 3405 602 25 32.0000000 34.72500 8.52% 22.5 3s Explored 5272 nodes (106671 simplex iterations) in 4.17 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%