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Re: [Help-glpk] glpk - memory problem

From: Xiaolan Zhang (Joy)
Subject: Re: [Help-glpk] glpk - memory problem
Date: Mon, 10 Apr 2006 12:52:21 +0400

Thank you very much. The problem size is about 4e11. I guess it is the
first case. However, up to now I am using glpk to output cplex problem
file rather than solving it. I thought it might work just to formulate a
large problem. Is the up-bound of glpk function 4Gb? If so, I might
think about other ways.


Andrew Makhorin wrote:
>> Could you help how to compile my program by gcc in 64bit mode? Because
>> my current problem is the parameter "ne" for lpx_load_matrix exceeds the
>> size of 32 bit "int". I have to use "long int" to represent "ne". Then,
>> lpx_load_matrix will have a warning of none comparative parameter.
> Do you mean that your problem has more than two billions coefficients?
> Or you just need to use long int's due to some other reasons? If the
> former, it is doubtful that glpk is able to solve such huge problem.
> Using 64-bit mode is only reasonable to address more space than 4Gb
> on solving large instances. To compile glpk in 64-bit mode you should
> specify appropriate hardware model options; for details see:

Best Regards,
Zhang, Xiaolan (Joy)

210 Coordinated Science Lab
University of Illinois, Urbana-champaign

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