Gurobi 5.6.3 (linux64) logging started Wed Oct  8 03:19:20 2014

Optimize a model with 44311 rows, 44310 columns and 132510 nonzeros
Presolve time: 1.23s
Presolved: 44311 rows, 44310 columns, 132510 nonzeros
Variable types: 0 continuous, 44310 integer (44310 binary)
Found heuristic solution: objective 22.3263881

Root relaxation: objective 1.530127e+01, 2750 iterations, 0.36 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

*    0     0               0      15.3012735   15.30127  0.00%     -    1s

Explored 0 nodes (2750 simplex iterations) in 1.71 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.530127352673e+01, best bound 1.530127352673e+01, gap 0.0%