Neighborhood collectives-reduce operation

问题:

I need the allreduce (MPI_Ineighbor_allreduce) for collective communication in MPI, unfortunately it is not included yet. The obvious, not so efficient solution, is to use MPI_Neighbor_alltoall at the expense of increasing buffer size, Do you have any suggestions? Is there any plan to include this in future releases?

Thanks

回答1:

there is no such thing as MPI_Neighbor_allreduce in the MPI standard. if you want it, feel free to ask for it at http://mpi-forum.org/

btw, did you mean to use MPI_Neighbor_allgather instead of MPI_Neighbor_alltoall in order to implement the neighbor allreduce ?