Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:51:25 2012 Optimize a model with 615 rows, 113 columns and 1230 nonzeros Presolve removed 215 rows and 1 columns Presolve time: 0.00s Presolved: 400 rows, 112 columns, 974 nonzeros Variable types: 0 continuous, 112 integer (112 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 4.018421e+01, 242 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 40.18421 0 112 28.00000 40.18421 43.5% - 0s H 0 0 29.0000000 40.18421 38.6% - 0s 0 0 39.67062 0 112 29.00000 39.67062 36.8% - 0s 0 0 39.45275 0 112 29.00000 39.45275 36.0% - 0s 0 0 39.25915 0 111 29.00000 39.25915 35.4% - 0s H 0 0 30.0000000 39.25915 30.9% - 0s 0 0 39.06329 0 112 30.00000 39.06329 30.2% - 0s 0 0 38.97910 0 112 30.00000 38.97910 29.9% - 0s 0 0 38.92421 0 112 30.00000 38.92421 29.7% - 0s 0 0 38.88041 0 112 30.00000 38.88041 29.6% - 0s 0 0 38.83803 0 112 30.00000 38.83803 29.5% - 0s H 0 0 31.0000000 38.83803 25.3% - 0s 0 0 38.74324 0 112 31.00000 38.74324 25.0% - 0s 0 0 38.50400 0 112 31.00000 38.50400 24.2% - 0s 0 0 38.46780 0 112 31.00000 38.46780 24.1% - 0s 0 0 38.44807 0 112 31.00000 38.44807 24.0% - 0s 0 2 38.44619 0 112 31.00000 38.44619 24.0% - 0s H 6 6 32.0000000 38.28020 19.6% 95.0 0s * 68 23 9 33.0000000 37.85294 14.7% 31.4 0s Cutting planes: Clique: 1 Zero half: 51 Explored 499 nodes (15153 simplex iterations) in 0.60 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%