Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:08:42 2013 Optimize a model with 2032 rows, 4046 columns and 14090 nonzeros Presolve removed 23 rows and 164 columns Presolve time: 0.17s Presolved: 2009 rows, 3882 columns, 11625 nonzeros Variable types: 2021 continuous, 1861 integer (1861 binary) Root relaxation: objective 3.882564e+03, 15 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3882.56402 0 2 - 3882.56402 - - 0s 0 0 3888.33062 0 2 - 3888.33062 - - 0s 0 0 3888.40585 0 2 - 3888.40585 - - 0s 0 0 3888.45719 0 2 - 3888.45719 - - 0s 0 0 3888.47412 0 2 - 3888.47412 - - 0s 0 0 3888.49097 0 2 - 3888.49097 - - 0s 0 0 3888.50772 0 2 - 3888.50772 - - 0s 0 2 3888.50772 0 2 - 3888.50772 - - 1s * 19 3 10 3893.9001900 3893.90017 0.00% 266 1s Cutting planes: Cover: 2 Flow cover: 2 GUB cover: 1 Explored 20 nodes (5143 simplex iterations) in 1.89 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.893900189954e+03, best bound 3.893900165610e+03, gap 0.0000%