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Re: [Help-glpk] glpk tells me to contact support team - xmalloc failed.

From: Michael Bramley
Subject: Re: [Help-glpk] glpk tells me to contact support team - xmalloc failed.
Date: Tue, 19 Jun 2012 12:09:10 -0400


Thanks for the response.
However, when I try the -wlp option I am informed that it is unknown. Are you 
referring to -w? Similarly with the --lp option.

I get that the intention is to break this into multiple steps, i.e.

glpsol -m MP_layout.mod -d MP_layout.dat -w MP_layout.lp --check
glpsol -m MP_layout.mod -d MP_layout.dat -r MP_layout.lp 

When I try the second step, glpsol complains that the MP_layout.lp does not 

I have read through the docs but seem to be missing important material. Can you 
please be more specific or point me in the right direction?


Michael Bramley
tel: +1 513 632 0549

-----Original Message-----
From: Andrew Makhorin [mailto:address@hidden 
Sent: Tuesday, June 19, 2012 11:31 AM
To: Michael Bramley
Cc: address@hidden
Subject: Re: [Help-glpk] glpk tells me to contact support team - xmalloc failed.

> Running a rather large model and I get the following output (see
> below), which is solved by AMPL in about 17 minutes (very old 32 bit
> version).

> All other testing runs quickly (smaller models) for this glpk 32 bit
> version (4.47).

> When I try the 64 bit version, I error at line 70 of glpenv05.c almost
> immediately.

> Any thoughts on how to proceed?

To reduce the memory requirements you may try to solve your model in two
stages as follows:

glpsol -m MP_layout.mod -d MP_layout.dat -wlp MP_layout.lp --check
glpsol --lp MP_layout.lp ...

However, being of mip class your model may happen to be hard for glpk
because of its size, so glpsol may not be able to solve it to optimality
for a reasonable time.

Please see:
for some calculations about the memory requirements.

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