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Re: [Help-glpk] help with .bv. model

From: Andrew Makhorin
Subject: Re: [Help-glpk] help with .bv. model
Date: Wed, 7 Mar 2007 07:23:57 +0300

> I am trying to count shift calendar problem, in the attachment you can see my 
> model
> after some seconds i got optimal solution and trying to find integer 
> solution, but after hours i have only this kind of output: 
> +6434641: mip =   1.920000000e+02 >=   1.900000000e+02   1.0% (125068; 112713)
> ^^^rising                ^^^ not going down anymore
> is it ok? do i have some problem in model?

This means that your model is hard for glpk b&b solver.

If a suboptimal solution (i.e. 192) is sufficient for you, you can
limit the solution time with the command-line option `--tmlim nnn';
note that the exact optimum is either 190 or 191 or 192.

Also you can try using the options `--intopt' or `--cuts'; sometimes
this helps.

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