Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:03:58 2012 Optimize a model with 18530 rows, 5112 columns and 60348 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.64s Presolved: 18528 rows, 5110 columns, 59826 nonzeros Variable types: 0 continuous, 5110 integer (5110 binary) Found heuristic solution: objective 71.0000000 Root relaxation: objective 2.000000e+00, 3960 iterations, 0.14 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 142 71.00000 2.00000 97.2% - 1s H 0 0 64.0000000 2.00000 96.9% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 662 5.00000 2.66667 46.7% - 11s H 0 0 4.0000000 2.66667 33.3% - 14s 0 0 2.66667 0 1515 4.00000 2.66667 33.3% - 14s 0 0 2.66667 0 186 4.00000 2.66667 33.3% - 17s 0 0 2.66990 0 4131 4.00000 2.66990 33.3% - 19s 0 0 2.66990 0 4202 4.00000 2.66990 33.3% - 21s 0 0 2.66990 0 4134 4.00000 2.66990 33.3% - 23s 0 0 2.66990 0 4132 4.00000 2.66990 33.3% - 24s 0 0 2.66990 0 4100 4.00000 2.66990 33.3% - 26s 0 0 2.66990 0 4155 4.00000 2.66990 33.3% - 27s 0 0 2.66990 0 4209 4.00000 2.66990 33.3% - 29s 0 0 2.66990 0 4196 4.00000 2.66990 33.3% - 31s 0 0 2.66990 0 4252 4.00000 2.66990 33.3% - 33s 0 0 2.66990 0 4171 4.00000 2.66990 33.3% - 34s 0 0 2.66990 0 4229 4.00000 2.66990 33.3% - 35s 0 0 2.66990 0 4229 4.00000 2.66990 33.3% - 36s 0 2 2.80000 0 4229 4.00000 2.80000 30.0% - 53s Cutting planes: Clique: 118 Zero half: 6 Explored 9 nodes (85180 simplex iterations) in 53.86 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%