Gurobi 5.0.1 (linux64) logging started Sat Nov 17 08:34:56 2012 Optimize a model with 77279 rows, 57840 columns and 288478 nonzeros Presolve removed 22 rows and 5280 columns (presolve time = 5s) ... Presolve removed 24 rows and 5282 columns Presolve time: 6.32s Presolved: 77255 rows, 52558 columns, 282554 nonzeros Variable types: 0 continuous, 52558 integer (52558 binary) Found heuristic solution: objective 240.0000000 Root relaxation: objective 2.000000e+00, 39521 iterations, 4.53 seconds Total elapsed time = 17.14s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 432 240.00000 2.00000 99.2% - 19s H 0 0 221.0000000 2.00000 99.1% - 19s H 0 0 4.0000000 2.00000 50.0% - 19s 0 0 2.20000 0 21287 4.00000 2.20000 45.0% - 105s H 0 0 3.0000000 2.20000 26.7% - 165s Cutting planes: Gomory: 1 Zero half: 14 Explored 0 nodes (192712 simplex iterations) in 165.62 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 3.000000000000e+00, gap 0.0%