Re: [Boost-bugs] [Boost C++ Libraries] #2586: all_gather generates a memory leak

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #2586: all_gather generates a memory leak
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-12-12 16:12:05

#2586: all_gather generates a memory leak
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  Reporter:  micdestefano_at_[hidden]  |       Owner:  troyer                                 
      Type:  Bugs                    |      Status:  new                                    
 Milestone:  Boost 1.38.0            |   Component:  mpi                                    
   Version:  Boost 1.36.0            |    Severity:  Cosmetic                               
Resolution:                          |    Keywords:  MPI all_gather valgrind still reachable
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Changes (by anonymous):

  * owner:  dgregor => troyer
  * severity:  Problem => Cosmetic

Comment:

 This is a minor issue. Boost.MPI creates a global map of MPI Datatypes
 used that are cached until the end of execution. They cannot be released
 at the end of program execution when the map is destroyed, since at that
 time MPI is no longer initialized. Since at that point in time a memory
 leak is irrelevant this is an acceptable decision.

 However, it causes this warning when users check their code by valgrind.
 Note that it will appear anytime you use a custom MPI datatype anywhere,
 not just when using all_reduce.

 We can still fix it in the next release, at the cost of slightly slower
 finalization of MPI.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2586#comment:1>
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