Gurobi 5.0.1 (linux64) logging started Thu Dec 20 12:45:34 2012 Optimize a model with 6722 rows, 6561 columns and 39720 nonzeros Presolve removed 3271 rows and 3615 columns Presolve time: 0.13s Presolved: 3451 rows, 2946 columns, 16549 nonzeros Variable types: 74 continuous, 2872 integer (2872 binary) Root relaxation: objective 5.852824e+02, 474 iterations, 0.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 585.28237 0 140 - 585.28237 - - 0s 0 0 597.51562 0 74 - 597.51562 - - 0s 0 0 598.00000 0 59 - 598.00000 - - 0s 0 0 598.00000 0 42 - 598.00000 - - 0s 0 0 598.00000 0 38 - 598.00000 - - 0s 0 0 598.00000 0 42 - 598.00000 - - 0s 0 0 598.00000 0 27 - 598.00000 - - 0s 0 0 598.00000 0 24 - 598.00000 - - 0s 0 0 598.00000 0 24 - 598.00000 - - 0s 0 0 598.00000 0 34 - 598.00000 - - 0s 0 0 598.00000 0 34 - 598.00000 - - 0s 0 0 598.00000 0 34 - 598.00000 - - 0s 0 2 598.00000 0 34 - 598.00000 - - 1s * 116 87 35 624.0000000 599.46341 3.93% 12.8 1s H 203 90 612.0000000 600.06341 1.95% 14.1 2s * 248 78 19 609.0000000 600.92258 1.33% 14.7 2s H 396 44 606.0000000 603.34884 0.44% 13.1 2s Cutting planes: Learned: 14 Gomory: 8 Cover: 22 Implied bound: 11 Clique: 1 MIR: 42 GUB cover: 19 Zero half: 4 Mod-K: 1 Explored 459 nodes (7400 simplex iterations) in 2.46 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.060000000000e+02, best bound 6.060000000000e+02, gap 0.0%