Re: [Help-glpk] what is the difference between this two glpsol?

[hhb83]

I will try it, thank you very much!


Andrew Makhorin wrote:
> 
>> I try several times. The results of the objective are same, but some
>> variables maybe different.
> 
> This is normal. Your instance has multiple optima, so one solver finds
> one optimal point while other finds another optimal point.
> 
>>  The most difference is that the glpsol
>> complied by cygwin gcc takes more time. In one sample, it takes 97.5sec
>> and 8.7M memory with the msvc compiled glpsol, but the gcc glpsol takes
>> 155.3s and 8.5M.
> 
> Try 'make CFLAGS=-O3' or 'make CFLAGS=-O4' for cygwin version.
> 
> Note that you should not expect identical results for different
> compilers, because glpk uses floating-point computations.
> 
> 
> 
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