[Fwd: Re: GLPK Exact option not working 2 different glpsol]

[Andrew Makhorin]

-------- Forwarded Message --------
From: Prabhu Manyem <prabhu.manyem@gmail.com>
To: Andrew Makhorin <mao@gnu.org>
Cc: bug-glpk@gnu.org
Subject: Re: GLPK Exact option not working 2 different glpsol
Date: Sun, 18 Sep 2022 12:44:00 +0930

> Dear Andrew,
> 
> OK, I re-installed GLPK again (as root)... But now, after
> re-installation, there are two versions of GLPK, and both have almost
> the same time stamp (Sept 18 12:28 and 12:29):
> 
> root> ls -al /opt/glpk-5.0/examples/glpsol
> -rwxr-xr-x 1 root root 6149 Sep 18 12:28 /opt/glpk-5.0/examples/glpsol
> 
> root> ls -al /usr/local/bin/glpsol
> -rwxr-xr-x 1 root root 98904 Sep 18 12:29 /usr/local/bin/glpsol
> 
> The first glpsol (in the glpk examples directory) works well with the
> "--exact"  option.
> 
> The second glpsol (at /usr/local/bin/)  does NOT work with the
> "--exact"  option.
> 
> I don't understand why GLPK installs 2 different versions of glpsol in
> 2 different directories.. Strange.
> 
> Anyway, I will start using the first glpsol  at:   /opt/glpk-
> 5.0/examples/glpsol
> 
> Thank you!
> 
> -Prabhu
> 
> 
> On Sun, 18 Sept 2022 at 10:56, Andrew Makhorin <mao@gnu.org> wrote:
> > 
> > Hi Prabhu,
> > 
> > Thank you for your interest in glpk.
> > 
> > 
> > I used the following commands to build glpk 5.0:
> > 
> > ./configure --with-gmp
> > 
> > make
> > 
> > cd examples
> > 
> > ./glpsol --mps ./murtagh.mps --max --exact
> > 
> > and all works correctly:
> > 
> > GLPSOL--GLPK LP/MIP Solver 5.0
> > Parameter(s) specified in the command line:
> >  --mps ./murtagh.mps --max --exact
> > Reading problem data from './murtagh.mps'...
> > Problem: OILREFI
> > Objective: PROFIT
> > 74 rows, 81 columns, 504 non-zeros
> > 600 records were read
> > One free row was removed
> > glp_exact: 73 rows, 81 columns, 474 non-zeros
> > GNU MP bignum library is being used
> > *     0:   objval =                      0   (42)
> > *   103:   objval =       126.057124110517   (0)
> > OPTIMAL SOLUTION FOUND
> > Time used:   0.1 secs
> > Memory used: 0.1 Mb (114012 bytes)
> > 
> > Please check if the GNU MP library is correctly installed.
> > If so, after running the configure script check the file
> > config.h created by the script and make sure that using the
> > GMP library is enabled:
> > 
> > #define HAVE_GMP 1
> > /* defined if the GNU MP bignum library is available */
> > /* requires <gmp.h> and -lgmp */
> > 
> > 
> > Best regards,
> > 
> > Andrew Makhorin
> > 
> > 
> > PS: Please report bugs to <bug-glpk@gnu.org>. Thanks.
> > 
> > 
> > 
> > 
> > On Sat, 2022-09-17 at 12:29 +0930, Prabhu Manyem wrote:
> > > Dear Andrew,
> > > 
> > > The "exact" option in my GLPK 5.0 (command line) is failing.. It
> > > says
> > > "GLPK bignum module is being used (Consider installing GNU MP to
> > > attain a much better performance.)"
> > > 
> > > However, I have installed GMP, and the GLPK 5.0 compilation and
> > > installation have also used GMP... Strange!
> > > 
> > > Let me attach my installation config file.. I copied the original
> > > config file into a new file called config-log.txt.
> > > 
> > > My configure command:
> > >      ./configure --with-gmp --enable-dl=ltdl
> > > 
> > > Some lines about GMP in the config file:
> > > configure:8316: checking gmp.h usability
> > > configure:8316: gcc -c -g -O2  conftest.c >&5
> > > configure:8316: $? = 0
> > > configure:8316: result: yes
> > > configure:8316: checking gmp.h presence
> > > configure:8316: gcc -E  conftest.c
> > > configure:8316: $? = 0
> > > configure:8316: result: yes
> > > configure:8316: checking for gmp.h
> > > configure:8316: result: yes
> > > configure:8326: checking whether to use GNU MP bignum library
> > > configure:8329: result: yes
> > > :
> > > ac_cv_header_gmp_h=yes
> > > :
> > > LIBS='-lltdl -lgmp -lm '
> > > 
> > > I downloaded and installed gmp-6.2.1, and then, I installed GLPK
> > > again.
> > > 
> > > LTDL has also been installed... Let me also attach the results of
> > > my
> > > "locate gmp" command in my Linux machine.
> > > 
> > > Any idea why the GLPK (at the command line) is unable to recognise
> > > GMP?  Thank you very much!
> > > 
> > > -Prabhu
> > > 
> > > Dr Prabhu Manyem
> > > Retired Professor of Applied Mathematics
> > > Nanchang Institute of Technology
> 
>