Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:02:52 2012 Optimize a model with 15731 rows, 4830 columns and 51679 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.52s Presolved: 15729 rows, 4828 columns, 51223 nonzeros Variable types: 0 continuous, 4828 integer (4828 binary) Found heuristic solution: objective 69.0000000 Root relaxation: objective 2.000000e+00, 3320 iterations, 0.13 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 138 69.00000 2.00000 97.1% - 0s H 0 0 68.0000000 2.00000 97.1% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 255 5.00000 2.66667 46.7% - 5s 0 0 2.67337 0 4155 5.00000 2.67337 46.5% - 5s 0 0 2.67337 0 4109 5.00000 2.67337 46.5% - 7s 0 0 2.67337 0 4117 5.00000 2.67337 46.5% - 8s 0 0 2.67337 0 3933 5.00000 2.67337 46.5% - 11s 0 0 2.67337 0 3732 5.00000 2.67337 46.5% - 15s 0 0 2.67337 0 3744 5.00000 2.67337 46.5% - 19s 0 0 2.67337 0 3706 5.00000 2.67337 46.5% - 21s 0 0 2.67337 0 3717 5.00000 2.67337 46.5% - 24s 0 0 2.67337 0 3611 5.00000 2.67337 46.5% - 26s 0 0 2.67337 0 3530 5.00000 2.67337 46.5% - 29s 0 0 2.67337 0 3664 5.00000 2.67337 46.5% - 31s 0 0 2.67337 0 3696 5.00000 2.67337 46.5% - 34s 0 0 2.67337 0 3661 5.00000 2.67337 46.5% - 36s 0 2 3.00000 0 3661 5.00000 3.00000 40.0% - 52s * 16 6 12 4.0000000 3.00000 25.0% 528 53s Cutting planes: Clique: 125 Zero half: 16 Explored 25 nodes (111784 simplex iterations) in 53.50 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%