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The algorithms are intended for MPI-3.0 compliance and are not optimized. We should aim to add better algorithms in the future through cheetah. MPI_Iallreduce and MPI_Igatherv on intercommunicators are required for MPI_Comm_idup support. cmr=v1.7.4:reviewer=brbarret:ticket=trac:2715 This commit was SVN r29333. The following Trac tickets were found above: Ticket 2715 --> https://svn.open-mpi.org/trac/ompi/ticket/2715