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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.
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