Gurobi 5.0.1 (linux64) logging started Fri Nov 16 08:39:47 2012 Optimize a model with 11967 rows, 4160 columns and 39742 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.34s Presolved: 12029 rows, 4158 columns, 43464 nonzeros Variable types: 0 continuous, 4158 integer (4158 binary) Found heuristic solution: objective 64.0000000 Root relaxation: objective 2.000000e+00, 3136 iterations, 0.10 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 128 64.00000 2.00000 96.9% - 0s H 0 0 55.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 667 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 1875 5.00000 2.66667 46.7% - 2s H 0 0 4.0000000 2.66667 33.3% - 6s 0 0 2.66667 0 154 4.00000 2.66667 33.3% - 10s 0 0 2.67027 0 3232 4.00000 2.67027 33.2% - 12s 0 0 2.67027 0 3192 4.00000 2.67027 33.2% - 13s 0 0 2.67027 0 3189 4.00000 2.67027 33.2% - 14s 0 0 2.67027 0 3213 4.00000 2.67027 33.2% - 14s 0 0 2.67027 0 3146 4.00000 2.67027 33.2% - 16s 0 0 2.67027 0 3198 4.00000 2.67027 33.2% - 17s 0 0 2.67027 0 3201 4.00000 2.67027 33.2% - 19s 0 0 2.67027 0 3145 4.00000 2.67027 33.2% - 20s 0 0 2.67027 0 3089 4.00000 2.67027 33.2% - 22s 0 0 2.67027 0 3064 4.00000 2.67027 33.2% - 24s 0 0 2.67027 0 3044 4.00000 2.67027 33.2% - 25s 0 0 2.67027 0 3099 4.00000 2.67027 33.2% - 27s 0 0 2.67027 0 2969 4.00000 2.67027 33.2% - 28s 0 0 2.67027 0 2978 4.00000 2.67027 33.2% - 29s 0 0 2.67027 0 2978 4.00000 2.67027 33.2% - 30s 0 2 2.80000 0 2978 4.00000 2.80000 30.0% - 35s Cutting planes: Clique: 62 Zero half: 13 Explored 11 nodes (98593 simplex iterations) in 37.93 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%