Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:43:40 2012 Optimize a model with 15904 rows, 5112 columns and 52540 nonzeros Presolve time: 0.12s Presolved: 15904 rows, 5112 columns, 52694 nonzeros Variable types: 0 continuous, 5112 integer (5112 binary) Found heuristic solution: objective 39.0000000 Root relaxation: objective 2.000000e+00, 5693 iterations, 0.31 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 142 39.00000 2.00000 94.9% - 2s H 0 0 11.0000000 2.00000 81.8% - 2s H 0 0 5.0000000 2.00000 60.0% - 2s 0 0 2.00000 0 142 5.00000 2.00000 60.0% - 4s 0 0 2.00000 0 142 5.00000 2.00000 60.0% - 13s H 0 0 4.0000000 2.00000 50.0% - 13s 0 0 2.00000 0 142 4.00000 2.00000 50.0% - 21s 0 0 2.00000 0 142 4.00000 2.00000 50.0% - 30s 0 0 2.00000 0 142 4.00000 2.00000 50.0% - 37s 0 0 2.00000 0 142 4.00000 2.00000 50.0% - 43s 0 2 2.00000 0 142 4.00000 2.00000 50.0% - 65s 1 3 2.50000 1 258 4.00000 2.00000 50.0% 39529 73s 2 4 2.50000 1 829 4.00000 2.50000 37.5% 37816 88s 4 6 2.66667 3 260 4.00000 2.50000 37.5% 20599 90s 5 7 2.66667 3 557 4.00000 2.50000 37.5% 19699 97s 23 7 2.66667 2 188 4.00000 2.50000 37.5% 4953 101s 41 7 2.66667 2 306 4.00000 2.66667 33.3% 3354 107s 71 9 2.66667 4 543 4.00000 2.66667 33.3% 2114 110s Cutting planes: Clique: 138 Zero half: 4 Explored 151 nodes (279027 simplex iterations) in 112.85 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%