Gurobi 5.0.1 (linux64) logging started Sat Nov 17 03:17:18 2012 Optimize a model with 55943 rows, 49506 columns and 216226 nonzeros Presolve removed 23 rows and 4664 columns Presolve time: 1.29s Presolved: 55920 rows, 44842 columns, 211060 nonzeros Variable types: 0 continuous, 44842 integer (44842 binary) Found heuristic solution: objective 222.0000000 Root relaxation: objective 2.000000e+00, 31570 iterations, 2.68 seconds Total elapsed time = 7.98s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 390 222.00000 2.00000 99.1% - 9s H 0 0 4.0000000 2.00000 50.0% - 9s H 0 0 3.0000000 2.00000 33.3% - 9s Cutting planes: Gomory: 1 Zero half: 1 Explored 0 nodes (105813 simplex iterations) in 9.56 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%