[Clp] OsiClpSolverInterface::computeLargestAway sets LogLevel

[Jan-Willem Goossens]

Sorry for the late reply.
Sebastian, that's indeed exactly what I was seeing too. Thanks for the
more detailed explanation.


On 18 October 2011 16:45, Sebastian Niemann
<sebastian.niemann at inform-software.com> wrote:
> Hi!
>
> I think we are facing the same problem. From some point on our virtual user
> print method is not called anymore. Debugging showed that this is due to the
> call "temp.setLogLevel(0)" in "OsiClpSolverInterface::computeLargestAway()".
>
> Although temp itself is a copy, the CoinMessageHandler member handler_ is
> *not* copied in case a custom handler is used (see beginning of method
> "ClpModel::gutsOfCopy"). The log level of "temp" (which - due to the shallow
> copy - is the log level of our custom handler) is never reset which then
> leads to silence...
>
> Cheers,
> Sebastian
>
> On 07.10.2011 18:23, John Forrest wrote:
>>
>> I don't really understand what problem is.
>>
>> temp is a separate copy which will be deleted on exit - logLevel in
>> modelPtr will not be changed (or have I misunderstood).
>>
>> John Forrest
>>
>> On Thu, 2011-10-06 at 13:59 +0300, Jan-Willem Goossens wrote:
>>>
>>> It seems to me that the computeLargestAway() method in
>>> OsiClpSolverInterface sets the LogLevel to a 'temporary' value, but
>>> doesnt set it back:
>>>
>>> OsiClpSolverInterface::computeLargestAway()
>>> {
>>>   // get largest scaled away from bound
>>>   ClpSimplex temp=*modelPtr_;
>>>   temp.setLogLevel(0);
>>>
>>>
>>> I guess the original value should be saved, and then re-set?
>>> Regards,
>>>
>>> Jan-Willem
>>> _______________________________________________
>>> Clp mailing list
>>> Clp at list.coin-or.org
>>> http://list.coin-or.org/mailman/listinfo/clp
>>>
>>
>>
>> _______________________________________________
>> Clp mailing list
>> Clp at list.coin-or.org
>> http://list.coin-or.org/mailman/listinfo/clp
>
> --
> Sebastian Niemann
> Airport Systems Division
> INFORM GmbH, Pascalstr. 23, 52076 Aachen, Germany
> Telefon: (+49) 2408 9456-3691
> E-Mail: sebastian.niemann at inform-software.com
> Web: http://www.inform-software.com
> INFORM Institut fur Operations Research und Management GmbH
> Registered AmtsG Aachen HRB1144 Gfhr. Adrian Weiler
> _______________________________________________
> Clp mailing list
> Clp at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/clp
>
>