Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:45:10 2012 Optimize a model with 12585 rows, 3906 columns and 41352 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.34s Presolved: 12583 rows, 3904 columns, 40946 nonzeros Variable types: 0 continuous, 3904 integer (3904 binary) Found heuristic solution: objective 62.0000000 Root relaxation: objective 2.000000e+00, 3075 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 0 124 62.00000 2.00000 96.8% - 0s H 0 0 56.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 1091 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 3360 5.00000 2.66667 46.7% - 2s H 0 0 4.0000000 2.66667 33.3% - 3s 0 0 2.66667 0 164 4.00000 2.66667 33.3% - 7s 0 0 2.67039 0 2988 4.00000 2.67039 33.2% - 10s 0 0 2.67039 0 3121 4.00000 2.67039 33.2% - 11s 0 0 2.67039 0 3046 4.00000 2.67039 33.2% - 12s 0 0 2.67039 0 3049 4.00000 2.67039 33.2% - 14s 0 0 2.67039 0 2991 4.00000 2.67039 33.2% - 16s 0 0 2.67039 0 2919 4.00000 2.67039 33.2% - 19s 0 0 2.67039 0 3052 4.00000 2.67039 33.2% - 21s 0 0 2.67039 0 3039 4.00000 2.67039 33.2% - 23s 0 0 2.67039 0 3100 4.00000 2.67039 33.2% - 25s 0 0 2.67039 0 3023 4.00000 2.67039 33.2% - 27s 0 0 2.67039 0 3027 4.00000 2.67039 33.2% - 29s 0 0 2.67039 0 3027 4.00000 2.67039 33.2% - 30s 0 2 2.80000 0 3027 4.00000 2.80000 30.0% - 36s Cutting planes: Clique: 81 Zero half: 7 Explored 7 nodes (99571 simplex iterations) in 39.50 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%