Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:23:31 2012 Optimize a model with 19709 rows, 5402 columns and 64165 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.68s Presolved: 19780 rows, 5400 columns, 68954 nonzeros Variable types: 0 continuous, 5400 integer (5400 binary) Found heuristic solution: objective 73.0000000 Root relaxation: objective 2.000000e+00, 3793 iterations, 0.16 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 146 73.00000 2.00000 97.3% - 1s H 0 0 71.0000000 2.00000 97.2% - 1s H 0 0 6.0000000 2.00000 66.7% - 3s 0 0 2.66667 0 202 6.00000 2.66667 55.6% - 15s 0 0 2.66981 0 4831 6.00000 2.66981 55.5% - 15s 0 0 2.66981 0 4824 6.00000 2.66981 55.5% - 18s 0 0 2.66981 0 4825 6.00000 2.66981 55.5% - 19s 0 0 2.66981 0 4382 6.00000 2.66981 55.5% - 22s 0 0 2.66981 0 4368 6.00000 2.66981 55.5% - 24s 0 0 2.66981 0 4323 6.00000 2.66981 55.5% - 26s 0 0 2.66981 0 4356 6.00000 2.66981 55.5% - 27s 0 0 2.66981 0 4354 6.00000 2.66981 55.5% - 29s 0 0 2.66981 0 4329 6.00000 2.66981 55.5% - 31s 0 0 2.66981 0 4334 6.00000 2.66981 55.5% - 33s 0 0 2.66981 0 4358 6.00000 2.66981 55.5% - 36s 0 0 2.66981 0 4301 6.00000 2.66981 55.5% - 38s 0 0 2.66981 0 4297 6.00000 2.66981 55.5% - 39s 0 0 2.66981 0 4296 6.00000 2.66981 55.5% - 41s 0 0 2.66981 0 4292 6.00000 2.66981 55.5% - 41s 0 0 2.66981 0 4291 6.00000 2.66981 55.5% - 43s 0 0 2.66981 0 4295 6.00000 2.66981 55.5% - 45s 0 0 2.66981 0 4249 6.00000 2.66981 55.5% - 46s 0 2 2.66981 0 4249 6.00000 2.66981 55.5% - 60s H 27 15 5.0000000 3.00000 40.0% 319 64s * 30 4 19 4.0000000 3.00000 25.0% 293 64s 34 0 cutoff 1 4.00000 4.00000 0.0% 450 65s Cutting planes: Clique: 117 Zero half: 3 Explored 35 nodes (92449 simplex iterations) in 65.56 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%