[SCIP] "Resolve instable" in SCIP statistics?

[Franzen, Christian]

Hi SCIP Team.


I am implementing a branch-and-price solver and for one of my benchmark instances solving is significantly slower than for other instances. In the statistics of SCIP is see the following output:


LP                 :       Time      Calls Iterations  Iter/call   Iter/sec  Time-0-It Calls-0-It    ItLimit
  primal LP        :   39822.63       1350   22117847   22431.89     555.41      80.20        364
  dual LP          :     903.64          9     622937   69215.22     689.36       0.00          0
  lex dual LP      :       0.00          0          0       0.00          -
  barrier LP       :       0.00          0          0       0.00          -       0.00          0
  resolve instable :   32994.26        583   21004525   36028.34     636.61
  diving/probing LP:       8.31         27      28543    1057.15    3436.36
  strong branching :       0.00          0          0       0.00          -          -          -          0
    (at root node) :          -          0          0       0.00          -
  conflict analysis:       0.00          0          0       0.00          -


I am not sure what these statistics tell me. Most of the time the LP solver is struggeling with resolving any instability. What kind of instability is meant here? Is this something related to numerical issues? What can I do to solve that "issue"?


Regards

Christian
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listserv.zib.de/pipermail/scip/attachments/20201218/f1d5f065/attachment.html>