Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:18:49 2012 Optimize a model with 5999 rows, 2550 columns and 20298 nonzeros Presolve removed 1402 rows and 2 columns Presolve time: 0.14s Presolved: 4597 rows, 2548 columns, 16764 nonzeros Variable types: 0 continuous, 2548 integer (2548 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 3.000000e+00, 4376 iterations, 0.50 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 64 50.00000 3.00000 94.0% - 2s H 0 0 25.0000000 3.00000 88.0% - 2s H 0 0 23.0000000 3.00000 87.0% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s 0 0 3.00000 0 97 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 infeasible 0 4.00000 3.00001 25.0% - 3s Cutting planes: Gomory: 2 Zero half: 44 Explored 0 nodes (19672 simplex iterations) in 3.17 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%