Use native NCCL Alltoall API when able.#136
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Signed-off-by: romerojosh <joshr@nvidia.com>
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Signed-off-by: Josh Romero <joshr@nvidia.com>
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NCCL 2.28.3 introduced a native NCCL Alltoall API. In recent NCCL releases, using this API opens up some potential performance benefits when combined with symmetric memory registration. This PR introduces usage of the NCCL Alltoall API where currently feasible without additional changes for symmetric memory benefits. Those will be made in a subsequent PR.