[SCIP] Too long solving time

[Matthias Miltenberger]

Dear Yu Chen,

your model has some numerical issues. The matrix coefficients are in the 
of 1e-05 to 1e+11. Such a large range can easily cause difficulties and 
violations in the final result.
To make matters worse, you are disabling presolving/simplification (-s0) 
and enforce very small tolerances (1e-10).

Testing other solvers on this instances also yielded warnings and 
violations due to the bad numerics.

My advice: Try to improve the model and verify that your result is 
actually meaningful with regards to the problem. I don't think that such 
a small tolerance is really required.

Oh and by the way: On my machine the model was solved within a second 
using the standard tolerances and default settings.

Cheers
Matthias

On 17.08.2018 10:59, Yu Chen wrote:
>
> Hi,
>
> I am new to Soplex but I encountered a trouble when using it.
>
> I made a LP file and used the code in terminal:
>
> /build/bin/soplex -f1e-10 -o1e-10 -l1e-10 -s0 -x -q -c
>
> But the Soplex took nearly one day to solve it. Do you know how to 
> decrease the solving time?
>
> Best regards,
>
> Yu
>
>
>
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-- 
\__________________

Matthias Miltenberger
Zuse Institute Berlin
Takustr. 7, 14195 Berlin
www.zib.de/miltenberger
miltenberger at zib.de
+49 (30) 841 85-245

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