Gurobi 5.0.1 (linux64) logging started Wed Apr 24 12:57:22 2013

Optimize a model with 2420 rows, 484220 columns and 968220 nonzeros
Presolve time: 1.49s
Presolved: 2420 rows, 484220 columns, 968220 nonzeros
Variable types: 484000 continuous, 220 integer (220 binary)

Root relaxation: objective 4.559921e+05, 16745 iterations, 2.75 seconds

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

     0     0 455992.144    0    6          - 455992.144     -      -    4s
H    0     0                    471735.00000 455992.144  3.34%     -    6s
H    0     0                    461375.00000 455992.144  1.17%     -    7s
     0     0 456100.535    0    4 461375.000 456100.535  1.14%     -    8s
     0     0 456100.535    0    6 461375.000 456100.535  1.14%     -   12s
     0     0 456100.535    0    4 461375.000 456100.535  1.14%     -   13s
     0     0 456108.491    0    4 461375.000 456108.491  1.14%     -   14s
     0     0 456113.373    0    3 461375.000 456113.373  1.14%     -   14s
     0     0 456113.907    0    2 461375.000 456113.907  1.14%     -   15s
     0     0 456113.907    0    2 461375.000 456113.907  1.14%     -   15s
H    0     0                    457443.00000 456113.907  0.29%     -   17s
     0     2 456119.115    0    2 457443.000 456119.115  0.29%     -   18s
H    4     4                    456439.00000 456140.205  0.07%  99.0   19s
     5     6 456178.091    5    1 456439.000 456140.205  0.07%   121   20s
*   21     3               9    456210.00000 456207.296  0.00%  98.3   22s

Cutting planes:
  Implied bound: 91
  Flow cover: 4

Explored 22 nodes (31598 simplex iterations) in 22.89 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.562100000000e+05, best bound 4.562072956989e+05, gap 0.0006%