mpi - What is Segmented Ring Allreduce in OpenMPI (V2.0.2)? How is it pipelined? -


i have been trying understand segemented ring allreduce in openmpi (v2.0.2). failed figure out pipelined ring allreduce, how phases pipelined. (i.e. computation phase 1 (b) seems perform 2 phases concurrently instead of "pipelinely".) mpi experts provide motivation behind segmented ring allreduce , details pipeline?

really appreciated, leo

i think has been asked , answered @ https://github.com/open-mpi/ompi/issues/4067

very specific questions regarding internals of open mpi, better asked directly open mpi mailing list(s) or github repository


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