Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:38:55 2012 Optimize a model with 600 rows, 156 columns and 1200 nonzeros Presolve removed 129 rows and 0 columns Presolve time: 0.00s Presolved: 471 rows, 156 columns, 1025 nonzeros Variable types: 0 continuous, 156 integer (156 binary) Found heuristic solution: objective 53.0000000 Root relaxation: objective 6.450000e+01, 307 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.50000 0 117 53.00000 64.50000 21.7% - 0s 0 0 63.75000 0 152 53.00000 63.75000 20.3% - 0s 0 0 63.16000 0 154 53.00000 63.16000 19.2% - 0s 0 0 62.48980 0 155 53.00000 62.48980 17.9% - 0s H 0 0 54.0000000 62.48980 15.7% - 0s 0 0 62.10000 0 152 54.00000 62.10000 15.0% - 0s 0 0 61.84759 0 154 54.00000 61.84759 14.5% - 0s 0 0 61.69240 0 155 54.00000 61.69240 14.2% - 0s H 0 0 55.0000000 61.69240 12.2% - 0s 0 0 61.54488 0 154 55.00000 61.54488 11.9% - 0s 0 0 61.46096 0 155 55.00000 61.46096 11.7% - 0s 0 0 61.39998 0 155 55.00000 61.39998 11.6% - 0s 0 0 61.38889 0 155 55.00000 61.38889 11.6% - 0s 0 0 61.38889 0 153 55.00000 61.38889 11.6% - 0s H 0 0 56.0000000 61.38889 9.62% - 0s 0 2 61.38812 0 153 56.00000 61.38812 9.62% - 0s Cutting planes: Zero half: 112 Explored 557 nodes (19856 simplex iterations) in 0.80 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%