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

**From**: |
hhb83 |

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

**Date**: |
Fri, 27 Feb 2009 06:55:01 -0800 (PST) |

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.*
>* *
>* *
>* *
>* _______________________________________________*
>* Help-glpk mailing list*
>* address@hidden*
>* http://lists.gnu.org/mailman/listinfo/help-glpk*
>* *
>* *
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