Gurobi 5.0.1 (linux64) logging started Sat Nov 17 03:36:32 2012 Optimize a model with 56195 rows, 49952 columns and 217423 nonzeros Presolve removed 17 rows and 3347 columns Presolve time: 1.30s Presolved: 56178 rows, 46605 columns, 213574 nonzeros Variable types: 0 continuous, 46605 integer (46605 binary) Found heuristic solution: objective 223.0000000 Root relaxation: objective 2.000000e+00, 33327 iterations, 3.05 seconds Total elapsed time = 8.72s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 400 223.00000 2.00000 99.1% - 10s H 0 0 4.0000000 2.00000 50.0% - 10s H 0 0 3.0000000 2.00000 33.3% - 10s Cutting planes: Gomory: 1 Explored 0 nodes (113682 simplex iterations) in 10.82 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 2.000000000000e+00, gap 33.3333%