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[Help-glpk] DIMACS, mincost and GLPSOL

From: Meketon, Marc
Subject: [Help-glpk] DIMACS, mincost and GLPSOL
Date: Tue, 5 Apr 2011 16:26:36 -0500

I am trying to run an assignment problem.  I created the DIMACS "mincost" file, I used the "glpsol --mincost filename" option.  Everything runs, but I'm not sure if it's using the out-of-kilter algorithm or the Simplex.  It kinda seems like the simplex, see below for the first few lines and last few lines.  If it is using the Simplex, does GLPSOL have an option for call the out-of-kilter method?  I couldn't find it in the documentation.
GLPSOL: GLPK LP/MIP Solver, v4.45
Parameter(s) specified in the command line:
 --mincost aa.lp --log log.txt --output out.txt --write solution.txt
Reading min-cost flow problem data from `aa.lp'...
Flow network has 30490 nodes and 3257988 arcs
3288479 lines were read
GLPK Simplex Optimizer, v4.45
30490 rows, 3257988 columns, 6515976 non-zeros
19360 rows, 3252321 columns, 6504642 non-zeros
 A: min|aij| = 1.000e+000  max|aij| = 1.000e+000  ratio = 1.000e+000
Problem data seem to be well scaled
Constructing initial basis...
Size of triangular part = 19346
      0: obj =  1.208490761e+009  infeas = 1.828e+004 (14)
    500: obj =  1.181597022e+009  infeas = 1.653e+004 (13)
*269500: obj =  6.601862690e+008  infeas = 0.000e+000 (3)
*269719: obj =  6.601862010e+008  infeas = 0.000e+000 (3)
Time used:   10526.6 secs
Memory used: 2543.0 Mb (2666503012 bytes)
Writing basic solution to `out.txt'...
Writing basic solution to `solution.txt'...
3288480 lines were written

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