Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:46:00 2012 Optimize a model with 9439 rows, 3540 columns and 31563 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.22s Presolved: 9496 rows, 3538 columns, 34724 nonzeros Variable types: 0 continuous, 3538 integer (3538 binary) Found heuristic solution: objective 59.0000000 Root relaxation: objective 2.000000e+00, 2575 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 118 59.00000 2.00000 96.6% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 1130 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 3063 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 293 5.00000 2.66667 46.7% - 4s H 0 0 4.0000000 2.66667 33.3% - 5s 0 0 2.68263 0 2616 4.00000 2.68263 32.9% - 7s 0 0 2.68263 0 2623 4.00000 2.68263 32.9% - 7s 0 0 2.68263 0 2614 4.00000 2.68263 32.9% - 9s 0 0 2.68263 0 2621 4.00000 2.68263 32.9% - 10s 0 0 2.68263 0 2602 4.00000 2.68263 32.9% - 12s 0 0 2.68263 0 2602 4.00000 2.68263 32.9% - 13s 0 0 2.68263 0 2555 4.00000 2.68263 32.9% - 14s 0 0 2.68263 0 2620 4.00000 2.68263 32.9% - 15s 0 0 2.68263 0 2620 4.00000 2.68263 32.9% - 16s 0 1 3.00000 0 2620 4.00000 3.00000 25.0% - 19s 9 0 cutoff 3 4.00000 4.00000 0.0% 594 20s Cutting planes: Clique: 131 Zero half: 1 Explored 10 nodes (48604 simplex iterations) in 20.05 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%