Gurobi 5.0.1 (linux64) logging started Wed Apr 24 16:15:58 2013

Optimize a model with 3520 rows, 1024320 columns and 2048320 nonzeros
Presolve removed 0 rows and 0 columns (presolve time = 9s) ...
Presolve removed 0 rows and 0 columns (presolve time = 10s) ...
Presolve time: 10.81s
Presolved: 3520 rows, 1024320 columns, 2048320 nonzeros
Variable types: 1024000 continuous, 320 integer (320 binary)

Starting sifting (using dual simplex for sub-problems)...

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0          0     infinity      5.5012000e+04      0s
       1      14701   1.7528000e+10   8.3360797e+04      0s
       2      25441   6.9675128e+07   8.4569677e+04      1s
       3      33872   1.6294991e+06   9.6937982e+04      1s
       4      45407   9.7869220e+05   1.4717283e+05      1s
       5      58381   9.1195612e+05   3.0685183e+05      2s
       6      72310   8.9935576e+05   7.3547873e+05      2s
       7      82819   8.9826762e+05   8.4160153e+05      2s
       8      91237   8.9183240e+05   8.7576395e+05      3s

Sifting complete


Root relaxation: objective 8.916359e+05, 97599 iterations, 2.74 seconds

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

     0     0 891635.915    0    4          - 891635.915     -      -   14s
H    0     0                    935769.00000 891635.915  4.72%     -   16s
H    0     0                    897532.00000 891635.915  0.66%     -   19s
     0     0 891826.263    0    3 897532.000 891826.263  0.64%     -   22s
     0     0 891826.263    0    4 897532.000 891826.263  0.64%     -   31s
     0     0 891827.415    0    3 897532.000 891827.415  0.64%     -   35s
     0     0 891832.821    0    2 897532.000 891832.821  0.63%     -   36s
     0     0 891832.821    0    2 897532.000 891832.821  0.63%     -   37s
     0     0 891832.821    0    2 897532.000 891832.821  0.63%     -   38s
     0     2 891835.056    0    2 897532.000 891835.056  0.63%     -   42s
     1     4 891908.159    1    3 897532.000 891908.159  0.63%   470   45s
H    5     5                    896436.00000 892000.699  0.49%   243   49s
H    8     6                    892310.00000 892000.699  0.03%   210   49s
     9     6 892221.938    8    2 892310.000 892000.699  0.03%   241   51s
*   10     5               9    892122.00000 892000.699  0.01%   217   51s

Cutting planes:
  Implied bound: 105
  Flow cover: 3

Explored 14 nodes (116758 simplex iterations) in 52.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.921220000000e+05, best bound 8.920793511027e+05, gap 0.0048%