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TL/UCP: reduce_scatter #353

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TL/UCP: reduce_scatter #353

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vspetrov
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What

Enables reduce-scatter implementation in TL/UCP.

Why ?

Main API. Also RS is needed for 2lvl Allreduce.

How ?

  • Enables Knomial RS to be used directly for reduce-scatter (not only as part of sra knomial allreduce)
  • Implements ring reduce-scatter. Bi or uni-directional (option, default bi-directional).
  • RS knomial falls back to ring for non-power K case
  • Adds gtests

@vspetrov vspetrov closed this Dec 6, 2021
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vspetrov commented Dec 6, 2021

replacing with #361

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