Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:23:38 2012 Optimize a model with 8931 rows, 3422 columns and 29926 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.20s Presolved: 8929 rows, 3420 columns, 29618 nonzeros Variable types: 0 continuous, 3420 integer (3420 binary) Found heuristic solution: objective 58.0000000 Root relaxation: objective 2.000000e+00, 2228 iterations, 0.06 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 116 58.00000 2.00000 96.6% - 0s H 0 0 55.0000000 2.00000 96.4% - 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 0 548 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 573 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 329 4.00000 2.66667 33.3% - 6s 0 0 2.68712 0 2317 4.00000 2.68712 32.8% - 10s 0 0 2.68712 0 2584 4.00000 2.68712 32.8% - 12s 0 0 2.68712 0 2341 4.00000 2.68712 32.8% - 16s 0 0 2.68712 0 2420 4.00000 2.68712 32.8% - 20s 0 0 2.68712 0 2522 4.00000 2.68712 32.8% - 23s 0 0 2.68712 0 2565 4.00000 2.68712 32.8% - 27s 0 0 2.68712 0 2560 4.00000 2.68712 32.8% - 29s 0 0 2.68712 0 2500 4.00000 2.68712 32.8% - 33s 0 0 2.68712 0 2596 4.00000 2.68712 32.8% - 37s 0 0 2.68712 0 2596 4.00000 2.68712 32.8% - 38s 0 1 3.00000 0 2596 4.00000 3.00000 25.0% - 49s 1 2 3.00000 1 127 4.00000 3.00000 25.0% 8054 50s Cutting planes: Clique: 95 Zero half: 8 Explored 8 nodes (159856 simplex iterations) in 50.67 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%