Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:20 2012 Optimize a model with 590 rows, 109 columns and 1180 nonzeros Presolve removed 225 rows and 0 columns Presolve time: 0.00s Presolved: 365 rows, 109 columns, 920 nonzeros Variable types: 0 continuous, 109 integer (109 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.855385e+01, 239 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38.55385 0 104 28.00000 38.55385 37.7% - 0s H 0 0 30.0000000 38.55385 28.5% - 0s 0 0 38.09015 0 107 30.00000 38.09015 27.0% - 0s 0 0 37.90801 0 107 30.00000 37.90801 26.4% - 0s 0 0 37.66116 0 105 30.00000 37.66116 25.5% - 0s 0 0 37.34001 0 105 30.00000 37.34001 24.5% - 0s H 0 0 31.0000000 37.34001 20.5% - 0s 0 0 37.10352 0 104 31.00000 37.10352 19.7% - 0s 0 0 37.00347 0 106 31.00000 37.00347 19.4% - 0s 0 0 36.93711 0 107 31.00000 36.93711 19.2% - 0s 0 0 36.76610 0 106 31.00000 36.76610 18.6% - 0s 0 0 36.71090 0 106 31.00000 36.71090 18.4% - 0s 0 0 36.68602 0 105 31.00000 36.68602 18.3% - 0s 0 0 36.66307 0 106 31.00000 36.66307 18.3% - 0s 0 0 36.65598 0 107 31.00000 36.65598 18.2% - 0s 0 0 36.65598 0 107 31.00000 36.65598 18.2% - 0s 0 2 36.65598 0 107 31.00000 36.65598 18.2% - 0s * 175 33 9 32.0000000 35.14723 9.84% 28.7 0s Cutting planes: Clique: 5 Zero half: 43 Explored 390 nodes (11028 simplex iterations) in 0.44 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%