Gurobi 5.0.1 (linux64) logging started Sat Nov 17 07:45:58 2012 Optimize a model with 70327 rows, 55932 columns and 265734 nonzeros Presolve removed 20 rows and 4720 columns (presolve time = 5s) ... Presolve removed 22 rows and 4722 columns Presolve time: 5.33s Presolved: 70305 rows, 51210 columns, 260418 nonzeros Variable types: 0 continuous, 51210 integer (51210 binary) Found heuristic solution: objective 236.0000000 Root relaxation: objective 2.000000e+00, 37833 iterations, 3.80 seconds Total elapsed time = 14.49s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 428 236.00000 2.00000 99.2% - 16s H 0 0 229.0000000 2.00000 99.1% - 16s H 0 0 4.0000000 2.00000 50.0% - 16s H 0 0 3.0000000 2.00000 33.3% - 16s Cutting planes: Zero half: 30 Explored 0 nodes (123703 simplex iterations) in 16.58 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%