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[fsdp,megatron,sglang] feat: Accelerate and Simplify Update weights logic and bump SGLang to 0.4.9.post6#2720

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zhaochenyang20 merged 14 commits intoverl-project:mainfrom
hebiao064:bhe/refactor_update_weights
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[fsdp,megatron,sglang] feat: Accelerate and Simplify Update weights logic and bump SGLang to 0.4.9.post6#2720
zhaochenyang20 merged 14 commits intoverl-project:mainfrom
hebiao064:bhe/refactor_update_weights

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@hebiao064 hebiao064 commented Jul 24, 2025

Co-authored-by: CuiBo 82354186+SuperCB@users.noreply.github.com
Co-authored-by: GeLee 865038696@qq.com
Co-authored-by: 杨睿 yangruipis@163.com

What does this PR do?

Context

Builds on the earlier work from #2620 to further simplify and unify the update weights logic from @SuperCB and @GeLee-Q

Motivation

We've received numerous complaints that the update weights logic in VERL SGLang is difficult to understand and error-prone during development. For example, a recent refactor from VerlEngine to AsyncEngine accidentally broke the torch reduce patch logic, leading to a 3× slowdown in weight updates.

Additionally, when changing the tensor update logic from per-tensor to batched updates, we had to duplicate the logic across both Megatron SGLang Sharding Manager and FSDP SGLang Sharding Manager. This not only introduced unnecessary complexity, but also made maintenance and future improvements harder.

To address these issues, we propose simplifying and centralizing the update weights logic within core SGLang, exposing a unified API that is transparent to all RL engines. This abstraction reduces duplication, improves reliability, and accelerates future development.

Benefits

  • ✅ Unified and transparent update weights API for all RL engines (FSDP, Megatron, etc.)
  • 🚀 Speedup QWen3 MoE weight updates from 110s to 30s
  • 🔧 Torch patch MP serializer to avoid inefficient P2P communication that slows down weight updates

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Code Review

This pull request significantly simplifies the weight update logic in both FSDP and Megatron sharding managers by leveraging a new sgl_update_weights utility. The refactoring greatly improves code readability and maintainability by abstracting away complex distributed communication logic.

I've found one critical issue: a likely copy-paste error in the MegatronSGLangShardingManager where an incorrect device_mesh_key is used, which would lead to a runtime error. Other than that, the changes look solid and are a great improvement.

Comment thread verl/workers/sharding_manager/megatron_sglang.py Outdated
@hebiao064 hebiao064 changed the title [fsdp,megatron,sglang] feat: [Do Not Merge] Simplify Update weights api with SGLang changes [Do Not Merge] [fsdp,megatron,sglang] feat: Simplify Update weights api with SGLang changes Jul 24, 2025
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Nice work!

@hebiao064 hebiao064 changed the title [Do Not Merge] [fsdp,megatron,sglang] feat: Simplify Update weights api with SGLang changes [fsdp,megatron,sglang] feat: Simplify Update weights api with SGLang changes and bump SGLang to 0.4.9.post6 Jul 31, 2025
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long river have crossed 🙏

@hebiao064 hebiao064 changed the title [fsdp,megatron,sglang] feat: Simplify Update weights api with SGLang changes and bump SGLang to 0.4.9.post6 [fsdp,megatron,sglang] feat: Accelerate and Simplify Update weights logic and bump SGLang to 0.4.9.post6 Aug 1, 2025
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Qwen2VL has bugs in transformers 4.53. We have to upgrade to 4.54 to use QWen2VL. We can ignore fsdp problem for now

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Qwen2VL has bugs in transformers 4.53. We have to upgrade to 4.54 to use QWen2VL. We can ignore fsdp problem for now

Would that also require vllm + transformer upgrade then?

I think we can follow ziyuan's suggestion #2720 (comment) for this PR and upgrade transformer/vllm in separate PR

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hebiao064 commented Aug 1, 2025

#2780 (comment) @vermouth1992

I fixed it in a separate PR: #2869

@zhaochenyang20 zhaochenyang20 merged commit 53f9b2b into verl-project:main Aug 2, 2025
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#2869)

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vyomakesh0728 added a commit to vyomakesh0728/verl that referenced this pull request Jan 22, 2026
vyomakesh0728 added a commit to vyomakesh0728/verl that referenced this pull request Jan 22, 2026
verl-project#2869)

### What does this PR do?

Do not merge before: verl-project#2720


> Add **concise** overview of what this PR aims to achieve or
accomplish. Reference related GitHub issues and PRs that help with the
review.
Bump xformers, fixing patched model code
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