Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:00 2012 Optimize a model with 123 rows, 62 columns and 246 nonzeros Presolve removed 49 rows and 18 columns Presolve time: 0.00s Presolved: 74 rows, 44 columns, 150 nonzeros Variable types: 0 continuous, 44 integer (44 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.000000e+01, 51 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 30.00000 0 36 27.00000 30.00000 11.1% - 0s H 0 0 28.0000000 30.00000 7.14% - 0s 0 0 29.50000 0 37 28.00000 29.50000 5.36% - 0s 0 0 29.33333 0 38 28.00000 29.33333 4.76% - 0s 0 0 cutoff 0 28.00000 28.99997 3.57% - 0s Cutting planes: Zero half: 29 Explored 0 nodes (117 simplex iterations) in 0.00 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%