[Cbc] Fw: [Cbc-tickets] [COIN-OR Branch-and-Cut MIP Solver] #87: CBC 2.4 crashes on Windows platfrom in Debug mode

Sun Feb 7 17:50:46 EST 2010

----- Original Message ----- 
From: Gabrielle A. Grun 
To: cbc-tickets at list.coin-or.org 
Sent: Sunday, February 07, 2010 2:44 PM
Subject: Re: [Cbc-tickets] [COIN-OR Branch-and-Cut MIP Solver] #87: CBC 2.4 crashes on Windows platfrom in Debug mode

Hi,
There have been issues with running previous versions of Cbc on Windows.
Look out for the alternateScan in CbcTree:bestNode---it may not be operational.
Try running sample2 with CbcCompareUser:::test fixed to always return false; this satisfies the internal Microsoft requirement of strict weak ordering for predicates.
Thanks.

Gabrielle A. Grün, Ph.D. Student
School of Computing Science
Simon Fraser University
8888 University Drive
Burnaby, BC
V5A 1S6
<http://www.cs.sfu.ca/~grun> 

  ----- Original Message ----- 
  From: COIN-OR Branch-and-Cut MIP Solver 
  Cc: cbc-tickets at list.coin-or.org 
  Sent: Friday, February 05, 2010 6:07 AM
  Subject: [Cbc-tickets] [COIN-OR Branch-and-Cut MIP Solver] #87: CBC 2.4 crashes on Windows platfrom in Debug mode

  #87: CBC 2.4 crashes on Windows platfrom in Debug mode
  -----------------------------+----------------------------------------------
   Reporter:  kistamas         |       Owner:  somebody
       Type:  defect           |      Status:  new     
   Priority:  major            |   Milestone:          
  Component:  component1       |     Version:          
   Keywords:  Cbc, Debug mode  |  
  -----------------------------+----------------------------------------------
   Hi,

   I have downloaded CBC 2.4 and try to use it on Windows 7.
   My development environment: Microsoft Visual C++ 2008.
   I compiled in Debug mode, and run sample2.cpp on flugpl.mps.
   I did not add any cut generators.
   The crash occurs in CbcModel::branchAndBound line 3910.

   This problem is even more mysterious because whether tree search crashed
   or not depended on the cut generators I added.
   Experiment 1) I added Gomory cuts, and the program terminated properly.
   Experiment 2) I added CglLandP cuts, and CBC crashed, but now at a
   different location: CbcModel::branchAndBound(), line 3681,
   and inside that CbcTree::bestNode(double cutoff=1.0000000000000001e+050)
   Line 273.

   Thank you for providing some feedback.

   Tamas Kis

  -- 
  Ticket URL: <https://projects.coin-or.org/Cbc/ticket/87>
  COIN-OR Branch-and-Cut MIP Solver <http://projects.coin-or.org/Cbc>
  An LP-based branch-and-cut MIP solver.

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Gabrielle A. Grün, Ph.D. Student
School of Computing Science
Simon Fraser University
8888 University Drive
Burnaby, BC
V5A 1S6
<http://www.cs.sfu.ca/~grun> 

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