[OS] OSoL

[Mike Steglich]

Hi Kipp,

Thank you for your fast answer. 

The reason for asking these things is a new CMPL feature. A CMPL user can define solver options using the following statement: %opt <solverName> <optionName> [<optionValue>]. CMPL transforms %opt statements into an OSoL file that is used automatically with the OSSolverservice.
(This feature will be also a part of the CMPL library we have talked about.)

So I've to reconsider this idea. Is there a complete list of the OSI solverOptions?

Cheers

Mike






Am 24.07.2011 um 20:42 schrieb "R. Kipp Martin" <kmartin at chicagobooth.edu>:

> Hi Mike
>> 
>> Is it possible to define solver options using an OSoL file for all solvers that are supported by OS.  I tried an OSoL file for glpk and it seems that there is no impact on glpk.
>> 
> 
> In theory, yes. OS communicates options to Glpk through Osi. Therefore, OS is limited in its option communication with Glpk by the options 1) the options supported by Osi, 2) the options supported by the Glpk-Osi interface. For example, if I wanted to control the print level in Glpk I would do
> 
> <solverOption name="OsiDoReducePrint" solver="osi" type="OsiHintParam" value="true"/>
> 
> Notice that the solver is osi and NOT glpk. So if you tell OSSolverService to use Glpk as the solver and give an OS option file you would actually give the solver name as osi. I hope this makes sense.
> 
> Now a very serious problem is that Osi does not support for example integer programming options such as node limit, etc. Hence you could not communicate something like this to Glpk. You could however to Cbc since we treat Cbc differently than other Osi solvers.
> 
> Thanks
> 
> 
> 
> -- 
> Kipp Martin
> Professor of Operations Research
> and Computing Technology
> Booth School of Business
> University of Chicago
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