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Thanks for the info. When you say "highly optimized" do you algorithmically,
tuning, or both? In particular I wonder if OMPI optimized collectives use
the divide and conquer strategy to maximize network bandwidth.
Sorry to be dense but I could not find documanetation on how to access the
optimized collectives. I would be willing to fiddle with the parameters a
bit by hand if I had some guidance as to how to set things and what I might
The optimization I was talking about (divide and conquer) would work better
than the basic strategy regardless of network; only message size might have
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