Gurobi 5.0.1 (linux64) logging started Mon Feb 4 16:01:38 2013 Optimize a model with 175 rows, 100 columns and 550 nonzeros Presolve removed 67 rows and 53 columns Presolve time: 0.00s Presolved: 108 rows, 47 columns, 352 nonzeros Variable types: 4 continuous, 43 integer (43 binary) Found heuristic solution: objective 1041.0000000 Root relaxation: objective 8.809263e+02, 6 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 880.92629 0 4 1041.00000 880.92629 15.4% - 0s H 0 0 902.0000000 880.92629 2.34% - 0s H 0 0 897.0000000 880.92629 1.79% - 0s 0 0 884.45349 0 7 897.00000 884.45349 1.40% - 0s H 0 0 893.0000000 884.45349 0.96% - 0s 0 0 885.85315 0 10 893.00000 885.85315 0.80% - 0s 0 0 887.32582 0 13 893.00000 887.32582 0.64% - 0s 0 0 888.13223 0 13 893.00000 888.13223 0.55% - 0s 0 0 888.14158 0 14 893.00000 888.14158 0.54% - 0s 0 0 888.80103 0 16 893.00000 888.80103 0.47% - 0s 0 0 888.89029 0 14 893.00000 888.89029 0.46% - 0s 0 0 888.89029 0 7 893.00000 888.89029 0.46% - 0s 0 0 889.14242 0 13 893.00000 889.14242 0.43% - 0s 0 0 889.66995 0 10 893.00000 889.66995 0.37% - 0s 0 0 890.08642 0 12 893.00000 890.08642 0.33% - 0s 0 0 890.14286 0 9 893.00000 890.14286 0.32% - 0s 0 0 890.14286 0 4 893.00000 890.14286 0.32% - 0s 0 2 891.00000 0 4 893.00000 891.00000 0.22% - 0s Cutting planes: Cover: 3 Clique: 1 MIR: 6 Explored 4 nodes (174 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.930000000000e+02, best bound 8.930000000000e+02, gap 0.0%