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UCC plugin for NCCL - adjustments #1021

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yaeliyac
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What

Add loopback option for allgather

Why ?

When using UCC plugin for NCCL, using cuda_memcpy might cause deadlock

How ?

Add UCC_TL_UCP_ALLGATHER_USE_CUDA flag to control this

@swx-jenkins3
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Can one of the admins verify this patch?

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