Re: [Help-glpk] memory usage seems very high

[Andrew Makhorin]

Marc,

> Attached is the zipped model.

Thank you.

> I have run many large models with this particular build that was
> compiled using Visual Studio 2008 C++ express.

> Running Joey's model, I received no error messages - just the first
> 12 or so "generating Cx" statements, and then the command prompt.

To build glpk 4.38 I used two batch files w32/Build_GLPK_with_VC9.bat
and w32/Build_GLPK_with_VC9_DLL.bat included in the glpk distribution.
In both cases glpsol successfully generated and solved the model
(please see the output below, which is identical in both cases).


Andrew Makhorin


GLPSOL: GLPK LP/MIP Solver 4.38
Reading model section from big2.mod...
Reading data section from big2.mod...
7105 lines were read
Generating z...
Generating c0...
Generating c1...
Generating c2...
Generating c3...
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Generating ca...
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Generating cc...
Generating cd...
Generating ce...
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Generating c10...
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Generating c50...
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Generating c5a...
Generating c5b...
Model has been successfully generated
glp_simplex: original LP has 93 rows, 5256 columns, 84143 non-zeros
glp_simplex: presolved LP has 82 rows, 5256 columns, 77163 non-zeros
Scaling...
 A: min|aij| = 1.000e+000  max|aij| = 1.600e+002  ratio = 1.600e+002
GM: min|aij| = 4.952e-001  max|aij| = 2.019e+000  ratio = 4.077e+000
EQ: min|aij| = 2.471e-001  max|aij| = 1.000e+000  ratio = 4.048e+000
Crashing...
Size of triangular part = 82
      0: obj =  0.000000000e+000  infeas = 5.657e+000 (0)
*    50: obj =  1.410800000e+000  infeas = 0.000e+000 (0)
*    80: obj = -7.209526707e-032  infeas = 2.776e-017 (0)
OPTIMAL SOLUTION FOUND
Time used:   0.2 secs
Memory used: 1340.1 Mb (1405234153 bytes)
reached the end
Model has been successfully processed