Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:22:35 2013 Optimize a model with 9177 rows, 1444 columns and 28158 nonzeros Presolve removed 3155 rows and 813 columns Presolve time: 0.07s Presolved: 6022 rows, 631 columns, 18345 nonzeros Variable types: 8 continuous, 623 integer (623 binary) Found heuristic solution: objective 31198.000000 Root relaxation: objective 2.688000e+04, 797 iterations, 0.03 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 26880.0000 0 8 31198.0000 26880.0000 13.8% - 0s H 0 0 26891.000000 26880.0000 0.04% - 0s 0 0 26880.2786 0 18 26891.0000 26880.2786 0.04% - 0s 0 0 26880.2786 0 8 26891.0000 26880.2786 0.04% - 0s H 0 0 26889.000000 26880.2786 0.03% - 0s 0 0 26880.3460 0 21 26889.0000 26880.3460 0.03% - 0s H 0 0 26885.000000 26880.3460 0.02% - 0s 0 1 26880.3815 0 21 26885.0000 26880.3815 0.02% - 0s Cutting planes: Cover: 3 MIR: 6 GUB cover: 1 Zero half: 1 Explored 5 nodes (1002 simplex iterations) in 0.20 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.688500000000e+04, best bound 2.688300000000e+04, gap 0.0074%