Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:14:03 2012 Optimize a model with 7991 rows, 2970 columns and 26674 nonzeros Presolve removed 3 rows and 56 columns Presolve time: 0.16s Presolved: 7988 rows, 2914 columns, 26324 nonzeros Variable types: 0 continuous, 2914 integer (2914 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 2.000000e+00, 2222 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 106 54.00000 2.00000 96.3% - 0s H 0 0 51.0000000 2.00000 96.1% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 2520 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 971 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 2508 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 139 4.00000 2.66667 33.3% - 5s 0 0 2.67097 0 2120 4.00000 2.67097 33.2% - 7s 0 0 2.67097 0 2165 4.00000 2.67097 33.2% - 7s 0 0 2.67097 0 2166 4.00000 2.67097 33.2% - 9s 0 0 2.67097 0 2251 4.00000 2.67097 33.2% - 11s 0 0 2.67097 0 2114 4.00000 2.67097 33.2% - 13s 0 0 2.67097 0 2170 4.00000 2.67097 33.2% - 15s 0 0 2.67097 0 2065 4.00000 2.67097 33.2% - 17s 0 0 2.67097 0 2091 4.00000 2.67097 33.2% - 20s 0 0 2.67097 0 2091 4.00000 2.67097 33.2% - 21s 0 2 2.80000 0 2091 4.00000 2.80000 30.0% - 27s Cutting planes: Clique: 31 Zero half: 8 Explored 13 nodes (98240 simplex iterations) in 28.41 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%