Gurobi 5.6.3 (linux64) logging started Tue Oct 7 20:28:43 2014 Optimize a model with 1561 rows, 1560 columns and 4602 nonzeros Presolve time: 0.02s Presolved: 1561 rows, 1560 columns, 4602 nonzeros Variable types: 0 continuous, 1560 integer (1560 binary) Found heuristic solution: objective 7.9195934 Root relaxation: objective 6.400299e+00, 496 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 6.4002991 6.40030 0.00% - 0s Explored 0 nodes (496 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.400299073071e+00, best bound 6.400299073071e+00, gap 0.0%