Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:00 2012 Optimize a model with 418 rows, 91 columns and 836 nonzeros Presolve removed 135 rows and 0 columns Presolve time: 0.01s Presolved: 283 rows, 91 columns, 681 nonzeros Variable types: 0 continuous, 91 integer (91 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.355725e+01, 168 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.55725 0 87 26.00000 33.55725 29.1% - 0s H 0 0 27.0000000 33.55725 24.3% - 0s 0 0 32.94387 0 87 27.00000 32.94387 22.0% - 0s 0 0 32.65763 0 87 27.00000 32.65763 21.0% - 0s 0 0 32.45367 0 89 27.00000 32.45367 20.2% - 0s 0 0 32.29204 0 89 27.00000 32.29204 19.6% - 0s 0 0 32.21872 0 89 27.00000 32.21872 19.3% - 0s H 0 0 28.0000000 32.21872 15.1% - 0s 0 0 32.06224 0 89 28.00000 32.06224 14.5% - 0s 0 0 31.91981 0 89 28.00000 31.91981 14.0% - 0s 0 0 31.76437 0 89 28.00000 31.76437 13.4% - 0s H 0 0 29.0000000 31.76437 9.53% - 0s 0 0 31.68643 0 90 29.00000 31.68643 9.26% - 0s 0 0 31.68643 0 91 29.00000 31.68643 9.26% - 0s 0 0 31.68643 0 89 29.00000 31.68643 9.26% - 0s 0 2 31.67864 0 89 29.00000 31.67864 9.24% - 0s Cutting planes: Clique: 1 Zero half: 52 Explored 27 nodes (1452 simplex iterations) in 0.10 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.900000000000e+01, best bound 2.900000000000e+01, gap 0.0%