Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:21:20 2012 Optimize a model with 6349 rows, 2550 columns and 21348 nonzeros Presolve removed 2102 rows and 2 columns Presolve time: 0.13s Presolved: 4297 rows, 2548 columns, 18828 nonzeros Variable types: 0 continuous, 2548 integer (2548 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 4.000000e+00, 3530 iterations, 0.31 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 4.00000 0 34 50.00000 4.00000 92.0% - 1s H 0 0 5.0000000 4.00000 20.0% - 1s H 0 0 4.0000000 4.00000 0.0% - 1s Explored 0 nodes (12339 simplex iterations) in 1.33 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%