[pull] master from comfyanonymous:master#298
Merged
pull[bot] merged 2 commits intocode:masterfrom Sep 17, 2025
Merged
Conversation
* flux: Do the xq and xk ropes one at a time This was doing independendent interleaved tensor math on the q and k tensors, leading to the holding of more than the minimum intermediates in VRAM. On a bad day, it would VRAM OOM on xk intermediates. Do everything q and then everything k, so torch can garbage collect all of qs intermediates before k allocates its intermediates. This reduces peak VRAM usage for some WAN2.2 inferences (at least). * wan: Optimize qkv intermediates on attention As commented. The former logic computed independent pieces of QKV in parallel which help more inference intermediates in VRAM spiking VRAM usage. Fully roping Q and garbage collecting the intermediates before touching K reduces the peak inference VRAM usage.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
See Commits and Changes for more details.
Created by
pull[bot] (v2.0.0-alpha.4)
Can you help keep this open source service alive? 💖 Please sponsor : )