[Coin-lpsolver] OsiClp/ClpSimplex/clp performance disparity

[John J Forrest]

Ojas,

If a feature is only available in one OsixxxSolverInterface (and especially
if it is of doubtful heritage) then I can not see the point of doing any
work which duplicates what is available by using getModelPtr() and also
encourages people to use the interface in untested ways.  For example I
regret giving in to some request and writing OsiCbcSolverInterface as it
has caused problems, both with builds and with expectations.

John Forrest


                                                                           
             Ojas Parekh                                                   
             <ojas at mathcs.emor                                             
             y.edu>                                                     To 
             Sent by:                  John J Forrest/Watson/IBM at IBMUS     
             coin-lpsolver-bou                                          cc 
             nces at list.coin-or         coin-lpsolver at list.coin-or.org      
             .org                                                  Subject 
                                       Re: [Coin-lpsolver]                 
                                       OsiClp/ClpSimplex/clp performance   
             05/02/06 03:09 PM         disparity                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




John, would you mind telling us a little more about this crash and why it
may not be a good idea to use it from Osi land?

-Ojas

      The reason qap10 is faster is because the non Osi interface allows
      itself to use a very dubious crash which works fantastically well on
      many problems.  I am not sure about encouraging people to use it
      directly from Osi land.


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