Gurobi 5.0.1 (linux64) logging started Fri Nov 16 01:11:56 2012 Optimize a model with 3824 rows, 650 columns and 11998 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.07s Presolved: 3822 rows, 648 columns, 18395 nonzeros Variable types: 0 continuous, 648 integer (648 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 4.628571e+00, 2679 iterations, 0.12 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 4.62857 0 266 25.00000 4.62857 81.5% - 0s H 0 0 18.0000000 4.62857 74.3% - 0s 0 0 6.00000 0 82 18.00000 6.00000 66.7% - 0s H 0 0 15.0000000 6.00000 60.0% - 0s H 0 0 7.0000000 6.00000 14.3% - 0s 0 0 6.00000 0 16 7.00000 6.00000 14.3% - 0s 0 0 6.00000 0 44 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 78 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 30 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 42 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 37 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 16 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 14 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 28 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 28 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 28 7.00000 6.00000 14.3% - 1s 0 2 6.00000 0 28 7.00000 6.00000 14.3% - 1s Cutting planes: Clique: 1 Zero half: 3 Explored 15 nodes (11366 simplex iterations) in 1.29 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.000000000000e+00, best bound 7.000000000000e+00, gap 0.0%