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[Train] Automatically set NCCL_SOCKET_IFNAME to use ethernet #28633

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merged 7 commits into from
Sep 21, 2022
Merged

[Train] Automatically set NCCL_SOCKET_IFNAME to use ethernet #28633

merged 7 commits into from
Sep 21, 2022

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amogkam
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@amogkam amogkam commented Sep 20, 2022 •
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Signed-off-by: Amog Kamsetty amogkamsetty@yahoo.com

Automatically set NCCL_SOCKET_IFNAME to prefer ethernet. Also adds a FAQ section in the docs on how to diagnose this issue.

Closes #26663

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  • I've run scripts/format.sh to lint the changes in this PR.
  • I've included any doc changes needed for https://docs.ray.io/en/master/.
  • I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
  • Testing Strategy
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    • This PR is not tested :(

@amogkam
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Signed-off-by: Amog Kamsetty <amogkamsetty@yahoo.com>
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matthewdeng
matthewdeng reviewed Sep 20, 2022
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Nice, thanks for doing this!!

doc/source/train/faq.rst
Comment on lines +78 to +79
2. Choose the network interface that corresponds to the private IP address of your node. In most cases, this will be either
`ens3` or `ens5`.
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Is there any NCCL documentation that corroborates this?

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no...nothing I could find. This is just from our experiences. Unfortunately the documentation around this is pretty sparse :(

python/ray/train/constants.py
# Use ethernet when possible.
# NCCL_SOCKET_IFNAME does a prefix match so "ens3" or "ens5" will match with
# "en".
DEFAULT_NCCL_SOCKET_IFNAME = "en,eth,bond"
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Double checking my understanding, does order matter here? Or does it matter what the order of ifconfig outputs?

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The first is prefered (first anything starting in en, then eth, then bond)

krfricke
krfricke reviewed Sep 20, 2022
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LGTM, do we have passing release tests?

Yard1
Yard1 approved these changes Sep 20, 2022
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One question, should we log or warn when we are doing this?

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Looks great ! Even updated tests are release tests with pytorch, can you also kick them off on PR to ensure everything works as expected ?

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amogkam commented Sep 20, 2022

@Yard1 added a debug statement

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amogkam commented Sep 21, 2022

Passing release test here: https://buildkite.com/ray-project/release-tests-pr/builds/15918#01835d56-ea64-4d75-8bac-56fc4d1c0198

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fix tests
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revert back lightning
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add back env var for vanilla torch
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amogkam commented Sep 21, 2022

Torch comparison benchmark release test passing here: https://buildkite.com/ray-project/release-tests-pr/builds/15987#018361b3-f423-4f53-bfbf-ed73cf7a7f8d

@amogkam amogkam merged commit c68a8c3 into ray-project:master Sep 21, 2022
@amogkam amogkam deleted the train-network-interface-doc branch September 21, 2022 21:39
@matthewdeng matthewdeng mentioned this pull request Jan 31, 2024
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@jiaodong jiaodong jiaodong approved these changes

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[AIR][Train] Add default network setting for pytorch multi-host training
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