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Enhance new_group doc to mention using NCCL concurrently. #48872

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Enhance new_group doc to mention using NCCL concurrently. #48872

wants to merge 3 commits into from

Commits on Dec 5, 2020

  1. Enhance new_group doc to mention using NCCL concurrently. 

    Using NCCL communicators concurrently is not safe and this is
documented in NCCL docs.

However, this is not documented in PyTorch and we should add documentation for
ProcessGroupNCCL so that users are aware of this limitation.

Differential Revision: [D25351778](https://our.internmc.facebook.com/intern/diff/D25351778/)

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    @pritamdamania
    pritamdamania committed Dec 5, 2020
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Commits on Dec 8, 2020

  1. Update on "Enhance new_group doc to mention using NCCL concurrently." 

    Using NCCL communicators concurrently is not safe and this is
documented in NCCL docs.

However, this is not documented in PyTorch and we should add documentation for
ProcessGroupNCCL so that users are aware of this limitation.

Differential Revision: [D25351778](https://our.internmc.facebook.com/intern/diff/D25351778/)

[ghstack-poisoned]
    @pritamdamania
    pritamdamania committed Dec 8, 2020
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Commits on Dec 9, 2020

  1. Update on "Enhance new_group doc to mention using NCCL concurrently." 

    Using NCCL communicators concurrently is not safe and this is
documented in NCCL docs.

However, this is not documented in PyTorch and we should add documentation for
ProcessGroupNCCL so that users are aware of this limitation.

Differential Revision: [D25351778](https://our.internmc.facebook.com/intern/diff/D25351778/)

[ghstack-poisoned]
    @pritamdamania
    pritamdamania committed Dec 9, 2020
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