Speed up model parallel initialization#1662
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alexqdh wants to merge 2 commits intoNVIDIA:mainfrom
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kvareddy
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Feb 18, 2026
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We are changing our review process and marking all open, unlabeled PRs as draft. This change will go in effect starting once #3659 is merged. Moving forward, all PRs will be required to start as draft PRs. If you wish to get your PR merged, mark your PR as “Ready for review”. Read more about the new process at submit.md. |
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The process groups are created on all ranks regardless of whether the current rank was actually part of that group. This is extremely time-consuming, especially during large-scale distributed training. By default, in torch groups should be created in the same order in all processes.
Parameter
use_local_synchronization=Trueis added to allcreate_group()calls to enable local synchronization optimization, which can further improve performance during group creation. After modification, process groups are now only created when the current rank is actually part of the group(if rank in ranks:).