Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:28 2012 Optimize a model with 420 rows, 124 columns and 840 nonzeros Presolve removed 74 rows and 3 columns Presolve time: 0.00s Presolved: 346 rows, 121 columns, 737 nonzeros Variable types: 0 continuous, 121 integer (121 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 5.430000e+01, 206 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54.30000 0 112 42.00000 54.30000 29.3% - 0s 0 0 52.75000 0 120 42.00000 52.75000 25.6% - 0s H 0 0 43.0000000 52.75000 22.7% - 0s 0 0 52.00000 0 112 43.00000 52.00000 20.9% - 0s H 0 0 44.0000000 52.00000 18.2% - 0s 0 0 51.75000 0 120 44.00000 51.75000 17.6% - 0s 0 0 51.54545 0 120 44.00000 51.54545 17.1% - 0s 0 0 51.22943 0 121 44.00000 51.22943 16.4% - 0s H 0 0 45.0000000 51.22943 13.8% - 0s 0 0 51.10431 0 120 45.00000 51.10431 13.6% - 0s 0 0 50.89089 0 120 45.00000 50.89089 13.1% - 0s 0 0 50.61720 0 120 45.00000 50.61720 12.5% - 0s 0 0 50.42082 0 121 45.00000 50.42082 12.0% - 0s 0 0 50.34961 0 120 45.00000 50.34961 11.9% - 0s 0 0 50.28377 0 121 45.00000 50.28377 11.7% - 0s 0 0 50.25193 0 121 45.00000 50.25193 11.7% - 0s 0 0 50.25193 0 121 45.00000 50.25193 11.7% - 0s 0 2 50.24259 0 121 45.00000 50.24259 11.7% - 0s * 57 16 12 46.0000000 49.93239 8.55% 27.6 0s Cutting planes: Gomory: 1 Zero half: 109 Explored 229 nodes (6094 simplex iterations) in 0.25 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.600000000000e+01, best bound 4.600000000000e+01, gap 0.0%