Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:17:42 2012 Optimize a model with 20497 rows, 5550 columns and 66672 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.71s Presolved: 20569 rows, 5548 columns, 71594 nonzeros Variable types: 0 continuous, 5548 integer (5548 binary) Found heuristic solution: objective 74.0000000 Root relaxation: objective 2.000000e+00, 3936 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 0 148 74.00000 2.00000 97.3% - 1s H 0 0 72.0000000 2.00000 97.2% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 3473 5.00000 2.66667 46.7% - 9s H 0 0 4.0000000 2.66667 33.3% - 14s 0 0 2.66667 0 3473 4.00000 2.66667 33.3% - 14s 0 0 2.66667 0 196 4.00000 2.66667 33.3% - 17s 0 0 2.66977 0 4483 4.00000 2.66977 33.3% - 19s 0 0 2.66977 0 4538 4.00000 2.66977 33.3% - 22s 0 0 2.66977 0 4493 4.00000 2.66977 33.3% - 23s 0 0 2.66977 0 4500 4.00000 2.66977 33.3% - 25s 0 0 2.66977 0 4386 4.00000 2.66977 33.3% - 27s 0 0 2.66977 0 4321 4.00000 2.66977 33.3% - 28s 0 0 2.66977 0 4417 4.00000 2.66977 33.3% - 29s 0 0 2.66977 0 4369 4.00000 2.66977 33.3% - 31s 0 0 2.66977 0 4372 4.00000 2.66977 33.3% - 33s 0 0 2.66977 0 4377 4.00000 2.66977 33.3% - 34s 0 0 2.66977 0 4377 4.00000 2.66977 33.3% - 35s 0 2 2.80000 0 4377 4.00000 2.80000 30.0% - 37s Cutting planes: Clique: 140 Zero half: 9 Explored 9 nodes (68098 simplex iterations) in 37.61 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%