[Coin-discuss] How to choose a MIP solver in GLPK OSI?

[Michal Kaut]

Hello,

I have a MIP problem that GlpSol with "--intopt" solves in 0.2 seconds, 
but won't solve at all without the option  (I let it run over the 
weekend, it did not even find a feasible solution...)

Unfortunately, using GLPK OSI uses the old/original lpx_integer() 
method, which is equivalent to running glpsol without parameters - and 
hence useless for my problem.
Is there a way (in OSI) to use lpx_intopt() instead of lpx_integer(), 
other than rewriting OsiGlpkSolverInterface::branchAndBound() and 
re-compiling OSI?

I found a discussion on coin-osi-devel from March 2006:
http://list.coin-or.org/pipermail/coin-osi-devel/2006-March/000002.html
Has anything changed since then? I really believe that it is important 
that OSI has some (preferably simple-to-use) interface to 
solver-specific options.

Note: In the discussion, they mention downcasting/direct call of the 
GLPK function. Would it work also from FlopCpp? If so, could someone 
show me how?


Thanks a lot in advance.


Regards,
Michal Kaut