TL/MLX5: generate schedule for zcopy allgather #1059
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The PR focuses on optimizing allgather communication by leveraging a pipelined multicast mechanism with configurable concurrency and prepost bucket sizes for recv buffers. It implements a new function,
ucc_tl_mlx5_mcast_prepare_zero_copy_allgather, which calculates and sets up a pipelined schedule for the zero-copy allgather. The function validates parameters, allocates schedules, and registers the receive buffers as well.