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coll: Get an MPI comm only if needed #126

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coll: Get an MPI comm only if needed #126

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@rzambre rzambre commented Jun 2, 2021

Just noticed while reading the code that the scope of comm in broadcast is limited to the special path branch.

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rzambre commented Jun 2, 2021

A follow-up question: if PE_root is always w.r.t. to the active set, when will the generic path branch execute? In other words, in what scenario will the root not be part of the active set?

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