Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:11:07 2012 Optimize a model with 18215 rows, 4830 columns and 59131 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.59s Presolved: 18282 rows, 4828 columns, 63364 nonzeros Variable types: 0 continuous, 4828 integer (4828 binary) Found heuristic solution: objective 69.0000000 Root relaxation: objective 2.000000e+00, 3331 iterations, 0.13 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 138 69.00000 2.00000 97.1% - 1s H 0 0 66.0000000 2.00000 97.0% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 3.00000 0 3408 5.00000 3.00000 40.0% - 15s 0 0 3.00000 0 3285 5.00000 3.00000 40.0% - 19s 0 0 3.00000 0 2951 5.00000 3.00000 40.0% - 20s H 0 0 4.0000000 3.00000 25.0% - 21s 0 0 3.00000 0 2822 4.00000 3.00000 25.0% - 21s 0 0 3.00000 0 2844 4.00000 3.00000 25.0% - 23s 0 0 3.00000 0 193 4.00000 3.00000 25.0% - 33s Cutting planes: Clique: 15 Zero half: 2 Explored 0 nodes (91468 simplex iterations) in 34.40 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%