Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:22:06 2012 Optimize a model with 12260 rows, 3782 columns and 40258 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.33s Presolved: 12258 rows, 3780 columns, 39856 nonzeros Variable types: 0 continuous, 3780 integer (3780 binary) Found heuristic solution: objective 61.0000000 Root relaxation: objective 2.000000e+00, 2832 iterations, 0.10 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 122 61.00000 2.00000 96.7% - 0s H 0 0 51.0000000 2.00000 96.1% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 476 5.00000 2.66667 46.7% - 2s H 0 0 4.0000000 2.66667 33.3% - 2s 0 0 2.69006 0 3567 4.00000 2.69006 32.7% - 3s 0 0 2.69006 0 3546 4.00000 2.69006 32.7% - 5s 0 0 2.69006 0 3533 4.00000 2.69006 32.7% - 5s 0 0 2.69006 0 3518 4.00000 2.69006 32.7% - 6s 0 0 2.69006 0 3522 4.00000 2.69006 32.7% - 7s 0 0 2.69006 0 3367 4.00000 2.69006 32.7% - 10s 0 0 2.69006 0 3184 4.00000 2.69006 32.7% - 11s 0 0 2.69006 0 3189 4.00000 2.69006 32.7% - 12s 0 0 2.69006 0 3210 4.00000 2.69006 32.7% - 14s 0 0 2.69006 0 3228 4.00000 2.69006 32.7% - 15s 0 0 2.69006 0 3228 4.00000 2.69006 32.7% - 16s 0 1 3.00000 0 3228 4.00000 3.00000 25.0% - 20s Cutting planes: Clique: 287 Zero half: 4 Explored 14 nodes (43697 simplex iterations) in 21.58 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%