Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012 Optimize a model with 330 rows, 81 columns and 660 nonzeros Presolve removed 124 rows and 3 columns Presolve time: 0.00s Presolved: 206 rows, 78 columns, 493 nonzeros Variable types: 0 continuous, 78 integer (78 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.050000e+01, 123 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 30.50000 0 62 24.00000 30.50000 27.1% - 0s H 0 0 25.0000000 30.50000 22.0% - 0s 0 0 30.00000 0 65 25.00000 30.00000 20.0% - 0s H 0 0 27.0000000 30.00000 11.1% - 0s 0 0 29.89362 0 78 27.00000 29.89362 10.7% - 0s 0 0 29.50000 0 77 27.00000 29.50000 9.26% - 0s 0 0 29.40000 0 70 27.00000 29.40000 8.89% - 0s 0 0 29.37838 0 75 27.00000 29.37838 8.81% - 0s 0 0 29.18000 0 75 27.00000 29.18000 8.07% - 0s 0 0 29.14286 0 75 27.00000 29.14286 7.94% - 0s 0 0 29.12500 0 75 27.00000 29.12500 7.87% - 0s 0 0 29.07143 0 75 27.00000 29.07143 7.67% - 0s 0 0 29.04167 0 72 27.00000 29.04167 7.56% - 0s 0 0 29.02778 0 74 27.00000 29.02778 7.51% - 0s 0 0 29.02778 0 72 27.00000 29.02778 7.51% - 0s 0 2 29.00000 0 72 27.00000 29.00000 7.41% - 0s * 5 3 4 28.0000000 28.80000 2.86% 28.6 0s Cutting planes: Zero half: 21 Explored 6 nodes (709 simplex iterations) in 0.05 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%