Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:06 2012 Optimize a model with 240 rows, 92 columns and 480 nonzeros Presolve removed 59 rows and 9 columns Presolve time: 0.00s Presolved: 181 rows, 83 columns, 384 nonzeros Variable types: 0 continuous, 83 integer (83 binary) Found heuristic solution: objective 37.0000000 Root relaxation: objective 4.150000e+01, 108 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 41.50000 0 67 37.00000 41.50000 12.2% - 0s 0 0 40.50000 0 77 37.00000 40.50000 9.46% - 0s H 0 0 38.0000000 40.50000 6.58% - 0s 0 0 39.66667 0 81 38.00000 39.66667 4.39% - 0s 0 0 39.30435 0 81 38.00000 39.30435 3.43% - 0s 0 0 39.24390 0 78 38.00000 39.24390 3.27% - 0s 0 0 39.12698 0 78 38.00000 39.12698 2.97% - 0s 0 0 39.00000 0 81 38.00000 39.00000 2.63% - 0s 0 0 39.00000 0 78 38.00000 39.00000 2.63% - 0s 0 0 cutoff 0 38.00000 38.99996 2.63% - 0s Cutting planes: Zero half: 26 Explored 0 nodes (329 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.800000000000e+01, best bound 3.800000000000e+01, gap 0.0%