[Osi] Is there a way to deactivate solver output?

[Christophe-Marie Duquesne]

I'll file a ticket when the coin server is up. Thank you for the workaround!

On Wed, May 12, 2010 at 11:08 AM, Stefan Vigerske
<stefan at math.hu-berlin.de> wrote:
> Hi,
>
>> Applying the tricks you gave above, I was able to deactivate output
>> for most solvers, except Xpress. Is there a chance I can also
>> deactivate that?
>
> I guess OsiXpr does not check for the loglevel in the message handler or
> the OsiDoReducedPrint flag. It would be nice if you could file a ticket
> at the Osi trac page (as soon as the coin server is up again).
> As a workaround, you can write your own message handler (derived from
> CoinMessageHandler) which just do nothing in its ::print() function. If
> you pass that one into OsiXpr, then the output of Xpress should be
> directed to there.
>
> Stefan
>
>>
>> #------------------------------------
>> #Stuff I want to get rid of:
>> #------------------------------------
>>
>> Reading Problem _xprs_
>> Problem Statistics
>>            0 (      0 spare) rows
>>            0 (      0 spare) structural columns
>>            0 (      0 spare) non-zero elements
>> Global Statistics
>>            0 entities        0 sets        0 set members
>>
>> Reading Problem Prob1
>> Problem Statistics
>>          600 (     50 spare) rows
>>          927 (      0 spare) structural columns
>>         2196 (    100 spare) non-zero elements
>> Global Statistics
>>            0 entities        0 sets        0 set members
>> Presolved problem has:    382 rows     676 cols    1676 non-zeros
>> Crash basis containing 187 structural columns created
>>
>>    Its         Obj Value      S   Ninf  Nneg        Sum Inf  Time
>>      0           .000000      D      1     0      42.000000     0
>>     58       49844.00000      D      0     0        .000000     0
>> Uncrunching matrix
>>     58       49844.00000      D      0     0        .000000     0
>> Optimal solution found
>> Presolved problem has:    372 rows     666 cols    1637 non-zeros
>> ?140 Warning: Basis lost - recovering
>>
>>    Its         Obj Value      S   Ninf  Nneg        Sum Inf  Time
>>      0       30800.00000      D      6     0        .000000     0
>>      1       49844.00000      D      0     0        .000000     0
>> Optimal solution found
>>
>> Starting root cutting & heuristics
>>
>>  Its Type    BestSoln    BestBound   Sols    Add    Del     Gap     GInf   Time
>> +         49844.00000  49844.00000      1               .000000        0      0
>>  *** Relative MIP gap less than MIPRELSTOP ***
>>  *** Search completed ***     Time:     0 Nodes:     1
>> Number of integer feasible solutions found is 1
>> Best integer solution found is  49844.00000
>> Best bound is  49844.00000
>> Uncrunching matrix
>> decrementInstanceCounter:: numInstances 1
>>
>>
>>
>
>



-- 
Christophe-Marie Duquesne
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