Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:12 2012 Optimize a model with 465 rows, 98 columns and 930 nonzeros Presolve removed 162 rows and 0 columns Presolve time: 0.00s Presolved: 303 rows, 98 columns, 739 nonzeros Variable types: 0 continuous, 98 integer (98 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.539683e+01, 210 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 35.39683 0 92 27.00000 35.39683 31.1% - 0s 0 0 34.98538 0 96 27.00000 34.98538 29.6% - 0s H 0 0 28.0000000 34.98538 24.9% - 0s H 0 0 31.0000000 34.98538 12.9% - 0s 0 0 34.82117 0 96 31.00000 34.82117 12.3% - 0s 0 0 34.63694 0 97 31.00000 34.63694 11.7% - 0s 0 0 34.43893 0 97 31.00000 34.43893 11.1% - 0s 0 0 34.30340 0 97 31.00000 34.30340 10.7% - 0s 0 0 34.19870 0 97 31.00000 34.19870 10.3% - 0s 0 0 34.13156 0 97 31.00000 34.13156 10.1% - 0s 0 0 34.05128 0 96 31.00000 34.05128 9.84% - 0s 0 0 33.99909 0 97 31.00000 33.99909 9.67% - 0s 0 0 33.99794 0 96 31.00000 33.99794 9.67% - 0s 0 0 33.98017 0 97 31.00000 33.98017 9.61% - 0s 0 0 33.96688 0 97 31.00000 33.96688 9.57% - 0s 0 0 33.96688 0 96 31.00000 33.96688 9.57% - 0s 0 2 33.96089 0 96 31.00000 33.96089 9.55% - 0s Cutting planes: Zero half: 40 Explored 40 nodes (1839 simplex iterations) in 0.13 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%