[Coin-discuss] using CLP barrier with OSI

[Kish Shen]

Hi John,

Thanks for your reply! 

On Friday 01 December 2006 09:37, John J Forrest wrote:
> Kish,
> 
> If it linked then it should be OK - the fact that you got errors meant it
> was trying to link in code.  You can double check with stand-alone version
> i.e. try
> 
> clp test.mps -barrier and
> clp test.mps -cholesky uni -barrier
> 
> and you should see improved ordering
>

In fact I have already successfully tested the new ClpInterior with my own code, and it
does run significantly faster with the Ufl code. Thanks!

What I was worried about is that I did not insert the flags into the right place, or miss other
places where they should be inserted. 

I could not find a test.mps file, so I could not run the test you suggested. I thought this might
be generated by `make test', which I didn't do, but when I tried this, I got a compiler error,
because the compilation of some code did not have the -lamd etc. flags, so obviously my hacks
were not generic enough...but I don't really need this, as all I need is a working libClp.a/.so file.

I decided to try out the CLP_USE_CHOLMOD. Would you recommend this? Does this give any
further performance improvements? 

On a related topic: should the ADD_CXXFLAGS (and other similar ADD_*) flags be added 
officially to the Makefile for Clp etc.? On another thread (about my problems compiling COIN
projects on x86_64), Andreas Waechter suggest that ADD_CXXFLAGS etc. should be the way
user pass their own flags to compile the COIN projects, so I guess they should be included
in the compiling of all code (and will be empty unless redefined by the user).

Kish Shen

> John Forrest
> 
> 
>                                                                            
>              Kish Shen                                                     
>              <K.Shen at crosscore                                             
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>                                                                    Subject 
>              11/30/06 11:54 PM         Re: [Coin-discuss] using CLP        
>                                        barrier with OSI                    
>                                                                            
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> 
> 
> 
> John J Forrest wrote:
> you do not use a
> > third-party ordering and factorization code.  One from the University
> > of Florida is suitable.  If I get time next week I will try and make
> > it easier to use with the svn version of Coin - It was working in the
> > old cvs version.  This what you have to do - add to your configure
> ADD_CXXFLAGS="-DUFL_BARRIER -I(directory with amd.h) -L(directory with
> > libamd.a) -lamd
> for compilation.
> suggested here, but
> have run into some
> Clp directory
> the following way:
> 
> 1. added ADD_CXXFLAGS to CXXCOMPILE and LTCXXCOMPILE, which is used to
> compile the code
> after
> libClp.la. This is needed to linking.
> correctly, but I got the code
> compiled.Should I have added it somewhere else?
> 
> Kish Shen
> but you have to add an extra -lamd in
> > Makefile (before -lm).  As I said I will try and make prettier next
> week.
> > might work well with a problem of the shape you describe.  If you then
> > want to convert to Osi the function calls would be very similar.
> Forrest
> coin-discuss-bounces at list.coin-or.org
> to
> >  <coin-discuss at list.coin-or.org>
> > To
> > Subject
> >
> nesting problems. I have quite a lot of variables (up to 1000)
> > representing positions of nested parts and approximatly the same
> of magnitude of constaints (up to 5000). Those constraints
> the non-overlapping condition between nested parts.
> those problems as fast as possible. I would like
> algorihtm can speed up my computation time ; and
> the barrier algorithm included in CLP with OSI
> >
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> list
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