Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:52 2012 Optimize a model with 328 rows, 84 columns and 656 nonzeros Presolve removed 95 rows and 2 columns Presolve time: 0.00s Presolved: 233 rows, 82 columns, 539 nonzeros Variable types: 0 continuous, 82 integer (82 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.400000e+01, 131 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 34.00000 0 56 28.00000 34.00000 21.4% - 0s 0 0 33.38095 0 79 28.00000 33.38095 19.2% - 0s H 0 0 29.0000000 33.38095 15.1% - 0s 0 0 32.91160 0 78 29.00000 32.91160 13.5% - 0s 0 0 32.53655 0 79 29.00000 32.53655 12.2% - 0s 0 0 32.40113 0 78 29.00000 32.40113 11.7% - 0s 0 0 32.28234 0 81 29.00000 32.28234 11.3% - 0s H 0 0 30.0000000 32.28234 7.61% - 0s 0 0 32.19956 0 82 30.00000 32.19956 7.33% - 0s 0 0 32.17687 0 80 30.00000 32.17687 7.26% - 0s 0 0 32.14860 0 81 30.00000 32.14860 7.16% - 0s 0 0 32.10627 0 80 30.00000 32.10627 7.02% - 0s 0 0 31.99371 0 78 30.00000 31.99371 6.65% - 0s 0 0 31.95451 0 80 30.00000 31.95451 6.52% - 0s 0 0 31.95212 0 81 30.00000 31.95212 6.51% - 0s 0 0 31.95212 0 81 30.00000 31.95212 6.51% - 0s 0 2 31.95212 0 81 30.00000 31.95212 6.51% - 0s Cutting planes: Zero half: 41 Explored 21 nodes (1031 simplex iterations) in 0.07 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0%