Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:45:44 2012 Optimize a model with 7487 rows, 2756 columns and 24958 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.14s Presolved: 7537 rows, 2754 columns, 27374 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 2.000000e+00, 2115 iterations, 0.05 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 104 52.00000 2.00000 96.2% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 2233 4.00000 2.66667 33.3% - 0s 0 0 2.66667 0 1481 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 2415 4.00000 2.66667 33.3% - 1s 0 0 2.67568 0 2184 4.00000 2.67568 33.1% - 7s 0 0 2.67568 0 2120 4.00000 2.67568 33.1% - 7s 0 0 2.67568 0 2163 4.00000 2.67568 33.1% - 8s 0 0 2.67568 0 2083 4.00000 2.67568 33.1% - 11s 0 0 2.67568 0 2130 4.00000 2.67568 33.1% - 13s 0 0 2.67568 0 2175 4.00000 2.67568 33.1% - 15s 0 0 2.67568 0 2157 4.00000 2.67568 33.1% - 17s 0 0 2.67568 0 2271 4.00000 2.67568 33.1% - 19s 0 0 2.67568 0 2273 4.00000 2.67568 33.1% - 22s 0 0 2.67568 0 2273 4.00000 2.67568 33.1% - 23s 0 1 3.00000 0 2273 4.00000 3.00000 25.0% - 27s Cutting planes: Clique: 81 Zero half: 7 Explored 10 nodes (86913 simplex iterations) in 28.47 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%