Interaction between NCCL_IB_SL and NCCL_IB_ADAPTIVE_ROUTING - Githubissues

NVIDIA / nccl-tests

NCCL Tests

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Interaction between NCCL_IB_SL and NCCL_IB_ADAPTIVE_ROUTING #199

Open DanieleDeSensi opened 5 months ago

DanieleDeSensi commented 5 months ago

Hi, it is not fully clear to me the precedence/interaction between NCCL_IB_SL and NCCL_IB_ADAPTIVE_ROUTING Specifically, let's suppose that adaptive routing is enabled on SL 1 only.

What happens if I specify NCCL_IB_ADAPTIVE_ROUTING=1 without specifying the SL?
What if I specify NCCL_IB_SL=1 but NCCL_IB_ADAPTIVE_ROUTING=0?
What if I specify NCCL_IB_ADAPTIVE_ROUTING=1 but NCCL_IB_SL=0? etc...

Thanks!