Gurobi 5.0.1 (linux64) logging started Mon Feb  4 19:01:55 2013

Optimize a model with 50183 rows, 4489 columns and 152626 nonzeros
Presolve removed 4535 rows and 2287 columns
Presolve time: 0.35s
Presolved: 45648 rows, 2202 columns, 138671 nonzeros
Variable types: 27 continuous, 2175 integer (2175 binary)
Found heuristic solution: objective 102139.00000

Root relaxation: objective 7.891290e+04, 11823 iterations, 0.98 seconds

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

     0     0 78912.9000    0   10 102139.000 78912.9000  22.7%     -    1s
H    0     0                    78927.000000 78912.9000  0.02%     -    1s
H    0     0                    78922.000000 78912.9000  0.01%     -    1s
H    0     0                    78921.000000 78912.9000  0.01%     -    1s
     0     0 78912.9000    0   23 78921.0000 78912.9000  0.01%     -    1s
     0     0 78912.9000    0   13 78921.0000 78912.9000  0.01%     -    2s
     0     0 78912.9000    0   22 78921.0000 78912.9000  0.01%     -    2s
     0     2 78912.9000    0   16 78921.0000 78912.9000  0.01%     -    2s
H    1     2                    78919.000000 78912.9000  0.01%  31.0    2s

Explored 2 nodes (13660 simplex iterations) in 2.22 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.891900000000e+04, best bound 7.891300000000e+04, gap 0.0076%