Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:00 2012 Optimize a model with 423 rows, 91 columns and 846 nonzeros Presolve removed 154 rows and 0 columns Presolve time: 0.00s Presolved: 269 rows, 91 columns, 675 nonzeros Variable types: 0 continuous, 91 integer (91 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.320833e+01, 203 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.20833 0 86 23.00000 33.20833 44.4% - 0s H 0 0 25.0000000 33.20833 32.8% - 0s H 0 0 26.0000000 33.20833 27.7% - 0s 0 0 32.43590 0 88 26.00000 32.43590 24.8% - 0s 0 0 32.23018 0 90 26.00000 32.23018 24.0% - 0s 0 0 31.98707 0 88 26.00000 31.98707 23.0% - 0s 0 0 31.85434 0 87 26.00000 31.85434 22.5% - 0s 0 0 31.73175 0 88 26.00000 31.73175 22.0% - 0s H 0 0 27.0000000 31.73175 17.5% - 0s 0 0 31.67010 0 88 27.00000 31.67010 17.3% - 0s 0 0 31.53076 0 88 27.00000 31.53076 16.8% - 0s 0 0 31.46370 0 89 27.00000 31.46370 16.5% - 0s 0 0 31.24967 0 90 27.00000 31.24967 15.7% - 0s 0 0 31.16614 0 90 27.00000 31.16614 15.4% - 0s 0 0 31.15356 0 90 27.00000 31.15356 15.4% - 0s 0 0 31.15356 0 90 27.00000 31.15356 15.4% - 0s 0 2 31.15301 0 90 27.00000 31.15301 15.4% - 0s * 11 7 8 28.0000000 31.15070 11.3% 31.4 0s Cutting planes: Clique: 2 Zero half: 40 Explored 63 nodes (2414 simplex iterations) in 0.12 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%