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Re: [Help-glpk] Can't apply Fpump

From: Andrew Makhorin
Subject: Re: [Help-glpk] Can't apply Fpump
Date: Thu, 29 Aug 2013 22:23:34 +0400

> I've using GLPK to model and solve a linear problem for quite a while.
> According to this mailing list, I'm lucky to have it solved using
> GLPK. The only reason why it's so quick to solve it if the Fpump.
> Recently, I've change the way I model the problem to satisfy a new
> business need and it's just taking for ever. Looking at the log, I see
> "FPUMP heuristic cannot be applied due to general integer variables".
> Correct me if I'm wrong, fpump can't be enabled because I've introduce
> an integer variable ?

Unfortunately, yes. Current implementation of the fpump heuristic is not
able to process general integer variables. However, you may try to
specify --binarize option to tell the mip preprocessor to replace
general integers by equivalent linear combinations of binary variables.

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