Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:57:48 2012 Optimize a model with 732 rows, 123 columns and 1464 nonzeros Presolve removed 277 rows and 0 columns Presolve time: 0.00s Presolved: 455 rows, 123 columns, 1164 nonzeros Variable types: 0 continuous, 123 integer (123 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 4.172785e+01, 308 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 41.72785 0 120 31.00000 41.72785 34.6% - 0s 0 0 41.23558 0 122 31.00000 41.23558 33.0% - 0s 0 0 41.04228 0 121 31.00000 41.04228 32.4% - 0s 0 0 40.87081 0 121 31.00000 40.87081 31.8% - 0s 0 0 40.82440 0 121 31.00000 40.82440 31.7% - 0s 0 0 40.62331 0 122 31.00000 40.62331 31.0% - 0s 0 0 40.55079 0 123 31.00000 40.55079 30.8% - 0s 0 0 40.49128 0 122 31.00000 40.49128 30.6% - 0s 0 0 40.43381 0 121 31.00000 40.43381 30.4% - 0s 0 0 40.36829 0 121 31.00000 40.36829 30.2% - 0s 0 0 40.32781 0 122 31.00000 40.32781 30.1% - 0s 0 0 40.29289 0 123 31.00000 40.29289 30.0% - 0s 0 0 40.28688 0 123 31.00000 40.28688 30.0% - 0s 0 0 40.28688 0 123 31.00000 40.28688 30.0% - 0s 0 2 40.28413 0 123 31.00000 40.28413 29.9% - 0s H 40 27 32.0000000 40.16732 25.5% 32.5 0s * 52 22 7 33.0000000 39.84627 20.7% 37.3 0s H 273 74 34.0000000 38.19695 12.3% 34.1 0s Cutting planes: Clique: 2 Zero half: 38 Explored 954 nodes (28612 simplex iterations) in 1.12 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.400000000000e+01, best bound 3.400000000000e+01, gap 0.0%