Gurobi 5.0.1 (linux64) logging started Wed Apr 24 13:30:45 2013

Optimize a model with 2750 rows, 625250 columns and 1250250 nonzeros
Presolve time: 2.33s
Presolved: 2750 rows, 625250 columns, 1250250 nonzeros
Variable types: 625000 continuous, 250 integer (250 binary)

Root relaxation: objective 6.144638e+05, 19579 iterations, 3.49 seconds

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

     0     0 614463.756    0    7          - 614463.756     -      -    6s
H    0     0                    658955.00000 614463.756  6.75%     -    7s
H    0     0                    621257.00000 614463.756  1.09%     -    9s
     0     0 614724.304    0    4 621257.000 614724.304  1.05%     -   11s
     0     0 614724.304    0    7 621257.000 614724.304  1.05%     -   16s
     0     0 614724.678    0    3 621257.000 614724.678  1.05%     -   19s
     0     0 614739.827    0    2 621257.000 614739.827  1.05%     -   20s
     0     0 614740.644    0    2 621257.000 614740.644  1.05%     -   21s
     0     0 614740.714    0    2 621257.000 614740.714  1.05%     -   21s
     0     0 614742.766    0    2 621257.000 614742.766  1.05%     -   22s
     0     0 614744.590    0    3 621257.000 614744.590  1.05%     -   24s
     0     0 614746.133    0    3 621257.000 614746.133  1.05%     -   24s
     0     0 614748.229    0    3 621257.000 614748.229  1.05%     -   25s
     0     0 614750.479    0    3 621257.000 614750.479  1.05%     -   26s
     0     0 614751.998    0    3 621257.000 614751.998  1.05%     -   27s
     0     0 614752.591    0    3 621257.000 614752.591  1.05%     -   28s
     0     0 614752.931    0    3 621257.000 614752.931  1.05%     -   29s
     0     0 614753.221    0    3 621257.000 614753.221  1.05%     -   30s
     0     0 614753.246    0    3 621257.000 614753.246  1.05%     -   31s
     0     2 614786.622    0    3 621257.000 614786.622  1.04%     -   34s
     1     4 614843.703    1    2 621257.000 614843.703  1.03%   426   36s
H    5     5                    619081.08824 614864.642  0.68%   162   38s
H    7     7                    618707.88756 614864.642  0.62%   172   40s
H    8     8                    617955.00000 614864.642  0.50%   224   41s
H   10     8                    615462.00000 614864.642  0.10%   205   42s
H   12     8                    615459.91515 614864.642  0.10%   176   42s
*   14     6              12    615235.00000 614864.642  0.06%   157   43s
    23     6 615176.066    2    3 615235.000 614944.212  0.05%   171   45s

Cutting planes:
  Implied bound: 228
  Flow cover: 8

Explored 34 nodes (41928 simplex iterations) in 48.19 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.152350000000e+05, best bound 6.151994970927e+05, gap 0.0058%