Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:16:43 2012 Optimize a model with 19271 rows, 5402 columns and 62851 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.68s Presolved: 19269 rows, 5400 columns, 62323 nonzeros Variable types: 0 continuous, 5400 integer (5400 binary) Found heuristic solution: objective 73.0000000 Root relaxation: objective 2.000000e+00, 3706 iterations, 0.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 146 73.00000 2.00000 97.3% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 1372 5.00000 2.66667 46.7% - 8s 0 0 2.66667 0 1042 5.00000 2.66667 46.7% - 8s 0 0 2.66667 0 659 5.00000 2.66667 46.7% - 8s H 0 0 4.0000000 2.66667 33.3% - 12s 0 0 2.68269 0 4614 4.00000 2.68269 32.9% - 14s 0 0 2.68269 0 4619 4.00000 2.68269 32.9% - 17s 0 0 2.68269 0 4072 4.00000 2.68269 32.9% - 21s 0 0 2.68269 0 4008 4.00000 2.68269 32.9% - 25s 0 0 2.68269 0 3962 4.00000 2.68269 32.9% - 28s 0 0 2.68269 0 3938 4.00000 2.68269 32.9% - 30s 0 0 2.68269 0 3942 4.00000 2.68269 32.9% - 33s 0 0 2.68269 0 4125 4.00000 2.68269 32.9% - 37s 0 0 2.68269 0 4021 4.00000 2.68269 32.9% - 40s 0 0 2.68269 0 4042 4.00000 2.68269 32.9% - 43s 0 0 2.68269 0 4042 4.00000 2.68269 32.9% - 45s 0 1 3.00000 0 4042 4.00000 3.00000 25.0% - 84s 6 1 infeasible 4 4.00000 3.00000 25.0% 1589 85s Cutting planes: Clique: 255 Zero half: 23 Explored 8 nodes (117076 simplex iterations) in 85.24 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%