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Gilles Gouaillardet 8bafe06c57 Fixes *alltoall* collectives at top level
This commit :
 - Correctly retrieve the communicator size when
   checking memory and parameters
 - Ensure (sendtype,sendcount) and (recvtype,recvcount)
   matches and return with MPI_ERR_TRUNCATE otherwise
 - Return with MPI_SUCCESS without invoking the low level
   if no data is going to be transferred
 - Fixes trac:4506

cmr=v1.8.2:reviewer=bosilca

This commit was SVN r31815.

The following Trac tickets were found above:
  Ticket 4506 --> https://svn.open-mpi.org/trac/ompi/ticket/4506
2014-05-19 07:46:07 +00:00
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