Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:25:00 2012 Optimize a model with 8931 rows, 3422 columns and 29926 nonzeros Presolve removed 3 rows and 60 columns Presolve time: 0.20s Presolved: 8928 rows, 3362 columns, 29560 nonzeros Variable types: 0 continuous, 3362 integer (3362 binary) Found heuristic solution: objective 58.0000000 Root relaxation: objective 2.000000e+00, 2359 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 114 58.00000 2.00000 96.6% - 0s H 0 0 51.0000000 2.00000 96.1% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 142 4.00000 2.66667 33.3% - 1s 0 0 2.67066 0 2769 4.00000 2.67066 33.2% - 1s 0 0 2.67066 0 2781 4.00000 2.67066 33.2% - 2s 0 0 2.67066 0 2549 4.00000 2.67066 33.2% - 3s 0 0 2.67066 0 2495 4.00000 2.67066 33.2% - 4s 0 0 2.67066 0 2331 4.00000 2.67066 33.2% - 5s 0 0 2.67066 0 2311 4.00000 2.67066 33.2% - 6s 0 0 2.67066 0 2407 4.00000 2.67066 33.2% - 7s 0 0 2.67066 0 2420 4.00000 2.67066 33.2% - 8s 0 0 2.67066 0 2353 4.00000 2.67066 33.2% - 9s 0 0 2.67066 0 2310 4.00000 2.67066 33.2% - 10s 0 0 2.67066 0 2290 4.00000 2.67066 33.2% - 11s 0 0 2.67066 0 2288 4.00000 2.67066 33.2% - 12s 0 0 2.67066 0 2300 4.00000 2.67066 33.2% - 13s 0 0 2.67066 0 2285 4.00000 2.67066 33.2% - 14s 0 0 2.67066 0 2298 4.00000 2.67066 33.2% - 15s 0 0 2.67066 0 2298 4.00000 2.67066 33.2% - 16s 0 2 2.80000 0 2298 4.00000 2.80000 30.0% - 18s Cutting planes: Clique: 59 Zero half: 17 Explored 17 nodes (64174 simplex iterations) in 19.74 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%