[DO NOT MERGE] Improve BFS performance for large-scale multi-node NVLink systems #5322
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…::pinned_memory_resource instead of creating this inside
…unless if we are directly broadcasting to the final desitnation
…tives on host communications with mpi_comm
…frontier size is tiny
…hronize() is only marginally more expensive than cudaStreamSynchronize(); cheaper than calling cudaStreamSynchronize() many times
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