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

[Michael Bramley]

Andrew:

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 
exist. 

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?

TIA

Michael Bramley
tel: +1 513 632 0549
www.dunnhumby.com


-----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:
http://lists.gnu.org/archive/html/help-glpk/2008-07/msg00044.html
for some calculations about the memory requirements.




The contents of this message and any attachments to it are confidential and may 
be legally privileged.
If you have received this message in error you should delete it from your 
system immediately and advise the sender.
dunnhumby may monitor and record all emails. The views expressed in this email 
are those of the sender and not those of dunnhumby.