Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:52 2012 Optimize a model with 548 rows, 106 columns and 1096 nonzeros Presolve removed 184 rows and 0 columns Presolve time: 0.00s Presolved: 364 rows, 106 columns, 874 nonzeros Variable types: 0 continuous, 106 integer (106 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.807692e+01, 211 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38.07692 0 95 28.00000 38.07692 36.0% - 0s H 0 0 31.0000000 38.07692 22.8% - 0s 0 0 37.37946 0 101 31.00000 37.37946 20.6% - 0s 0 0 36.85192 0 102 31.00000 36.85192 18.9% - 0s 0 0 36.56585 0 101 31.00000 36.56585 18.0% - 0s 0 0 36.48910 0 102 31.00000 36.48910 17.7% - 0s 0 0 36.41325 0 101 31.00000 36.41325 17.5% - 0s H 0 0 32.0000000 36.41325 13.8% - 0s 0 0 36.30481 0 98 32.00000 36.30481 13.5% - 0s 0 0 36.24042 0 101 32.00000 36.24042 13.3% - 0s 0 0 36.09138 0 99 32.00000 36.09138 12.8% - 0s 0 0 35.90372 0 102 32.00000 35.90372 12.2% - 0s 0 0 35.88355 0 101 32.00000 35.88355 12.1% - 0s 0 0 35.86934 0 100 32.00000 35.86934 12.1% - 0s 0 0 35.86670 0 100 32.00000 35.86670 12.1% - 0s 0 0 35.86670 0 100 32.00000 35.86670 12.1% - 0s 0 2 35.86670 0 100 32.00000 35.86670 12.1% - 0s Cutting planes: Clique: 1 Zero half: 54 Explored 117 nodes (4337 simplex iterations) in 0.22 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%