Re: [Boost-bugs] [Boost C++ Libraries] #5596: MPI: problem creating communicator

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5596: MPI: problem creating communicator
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-06-13 19:31:56

#5596: MPI: problem creating communicator
----------------------------------------+-----------------------------------
  Reporter:  irek.szczesniak@…          |       Owner:  dgregor
      Type:  Bugs                       |      Status:  new    
 Milestone:  To Be Determined           |   Component:  mpi    
   Version:  Boost 1.42.0               |    Severity:  Problem
Resolution:                             |    Keywords:         
----------------------------------------+-----------------------------------

Comment (by dwsel <dwsel@…>):

 Replying to [comment:3 monika.cienkus@…]:
 > It's strange but dynamically created communicator work fine.
 >
 >
 > {{{
 > #include <vector>
 > #include <boost/mpi.hpp>
 > namespace mpi = boost::mpi;
 > int main(int argc, char argv[])

 Hello!

 I have noticed as well you left out clause:
 {{{
 #!div style="font-size: 80%"
   {{{#!cpp
 if (!world.rank())
   }}}
 }}}
 That could confirm my 3rd suspicion, but... more about my opinion below


 You missed * in:
 {{{
 #!div style="font-size: 80%"
   {{{#!cpp
 int main(int argc, char * argv[])
   }}}
 }}}

 After that your code compiles well.

 Could you show me example use of the c communicator? I can't seem to get
 it to work so far. Something as simple as:
 {{{
 #!div style="font-size: 80%"
   {{{#!cpp
 if (c->rank() == 0)
   }}}
 }}}

 gives me clone_impl exception in addition to the same pionter exceptions I
 get by simply dropping clause:
 {{{
 #!div style="font-size: 80%"
   {{{#!cpp
 if (!world.rank())
   }}}
 }}}
 in the example provided by the author of the ticket. It seems that using
 pointer to c is only delaying exceptions to the moment of the using it!

 I think what are we doing here is simply redefinition of c but done by
 different threads, that's why I believe dropping clause will not help at
 all, because assigning processes to the communicator should be done by
 single process.

 Please elaborate.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5596#comment:5>
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