[data] feat: TransferQueue - Add zero-copy serialization support & usage improvement by 0oshowero0 · Pull Request #4429 · verl-project/verl

0oshowero0 · 2025-12-05T08:26:40Z

What does this PR do?

Support zero-copy serialization for SimpleUnit backend through environment variable TQ_ZERO_COPY_SERIALIZATION. [4/4][serialization] Perf: support non-jagged nested tensor for zero-copy serialization in SimpleUnit backend TransferQueue/TransferQueue#121
When calling tq_client.async_put(), TQ will return the updated BatchMeta object to the user. This will improve user experience when using TQ. [Feat] Update BatchMeta after calling put TransferQueue/TransferQueue#119
Add log for transferqueue_utils.py
Add new BatchMeta operations to simplify single-controller usage

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Signed-off-by: 0oshowero0 <o0shower0o@outlook.com>

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Code Review

This pull request updates the TransferQueue dependency to version 0.1.3.dev5. This is a positive step towards integrating new features like zero-copy serialization and an improved async_put method. However, my review highlights a concern with using a development (.dev) version of a dependency, which poses a stability risk. I have added comments recommending a switch to a stable release if possible. Furthermore, while this PR updates the dependency, the new features described in the PR description do not appear to be utilized yet in the existing codebase (e.g., in verl/utils/transferqueue_utils.py). I suggest creating a follow-up task to adopt these improvements to fully leverage the updated dependency.

requirements_transferqueue.txt

setup.py

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Pull request overview

This PR upgrades the TransferQueue dependency from version 0.1.2.dev0 to 0.1.3.dev5, enabling zero-copy serialization support and improved API functionality.

Key Changes:

Updated TransferQueue version to 0.1.3.dev5 across all dependency specifications
Enables zero-copy serialization through environment variable configuration
Returns BatchMeta object from async_put() calls for improved user experience

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
setup.py	Updated TRANSFERQUEUE_REQUIRES to version 0.1.3.dev5
requirements_transferqueue.txt	Updated TransferQueue package version to 0.1.3.dev5
.github/workflows/e2e_transferqueue.yml	Updated TransferQueue installation version in both FSDP and Megatron test jobs

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Signed-off-by: 0oshowero0 <o0shower0o@outlook.com>

wuxibin89 · 2025-12-08T06:22:46Z

recipe/transfer_queue/run_qwen3-8b_transferqueue.sh

 log_file="${log_dir}/qwen3-8b_tq_${timestamp}.log"

+# You may try to enable zero-copy serialization for TransferQueue when using SimpleStorageUnit backend.
+export TQ_ZERO_COPY_SERIALIZATION=False


Is there a side-effect when TQ_ZERO_COPY_SERIALIZATION=True? Can we always enable it?

Enable zero copy serialization will lead to a slightly higher deserialization cost since we need to deserialize each tensor in a loop. For nested tensors in torch.strided layout, we also need to reconstruct the nested tensor during deserialization.

In our experiment, enable TQ_ZERO_COPY_SERIALIZATION=True will slightly decrease the throughput for small tensors. So we still use False as default setting for now.

Refer to:
https://www.yuque.com/haomingzi-lfse7/hlx5g0/asmgy8hp5535bxu3?singleDoc#

wuxibin89 · 2025-12-08T06:23:27Z

requirements_transferqueue.txt

@@ -1,2 +1,2 @@
 # requirements.txt records the full set of dependencies for development
-TransferQueue==0.1.2.dev0


There's no need a separate requirements_transferqueue.txt since we already set it in setup.py.

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verl/utils/transferqueue_utils.py

Signed-off-by: 0oshowero0 <o0shower0o@outlook.com>

…age improvement (verl-project#4429) ### What does this PR do? 1. Support zero-copy serialization for SimpleUnit backend through environment variable `TQ_ZERO_COPY_SERIALIZATION`. TransferQueue/TransferQueue#121 2. When calling `tq_client.async_put()`, TQ will return the updated `BatchMeta` object to the user. This will improve user experience when using TQ. TransferQueue/TransferQueue#119 3. Add log for transferqueue_utils.py 4. Add new BatchMeta operations to simplify single-controller usage ### Checklist Before Starting - [x] Search for similar PRs. Paste at least one query link here: ... - [x] Format the PR title as `[{modules}] {type}: {description}` (This will be checked by the CI) - `{modules}` include `fsdp`, `megatron`, `sglang`, `vllm`, `rollout`, `trainer`, `ci`, `training_utils`, `recipe`, `hardware`, `deployment`, `ray`, `worker`, `single_controller`, `misc`, `perf`, `model`, `algo`, `env`, `tool`, `ckpt`, `doc`, `data` - If this PR involves multiple modules, separate them with `,` like `[megatron, fsdp, doc]` - `{type}` is in `feat`, `fix`, `refactor`, `chore`, `test` - If this PR breaks any API (CLI arguments, config, function signature, etc.), add `[BREAKING]` to the beginning of the title. - Example: `[BREAKING][fsdp, megatron] feat: dynamic batching` ### Test > For changes that can not be tested by CI (e.g., algorithm implementation, new model support), validate by experiment(s) and show results like training curve plots, evaluation results, etc. ### API and Usage Example > Demonstrate how the API changes if any, and provide usage example(s) if possible. ```python # Add code snippet or script demonstrating how to use this ``` ### Design & Code Changes > Demonstrate the high-level design if this PR is complex, and list the specific changes. ### Checklist Before Submitting > [!IMPORTANT] > Please check all the following items before requesting a review, otherwise the reviewer might deprioritize this PR for review. - [x] Read the [Contribute Guide](https://github.com/volcengine/verl/blob/main/CONTRIBUTING.md). - [x] Apply [pre-commit checks](https://github.com/volcengine/verl/blob/main/CONTRIBUTING.md#code-linting-and-formatting): `pre-commit install && pre-commit run --all-files --show-diff-on-failure --color=always` - [x] Add / Update [the documentation](https://github.com/volcengine/verl/tree/main/docs). - [x] Add unit or end-to-end test(s) to [the CI workflow](https://github.com/volcengine/verl/tree/main/.github/workflows) to cover all the code. If not feasible, explain why: ... - [ ] Once your PR is ready for CI, send a message in [the `ci-request` channel](https://verl-project.slack.com/archives/C091TCESWB1) in [the `verl` Slack workspace](https://join.slack.com/t/verl-project/shared_invite/zt-3855yhg8g-CTkqXu~hKojPCmo7k_yXTQ). (If not accessible, please try [the Feishu group (飞书群)](https://applink.larkoffice.com/client/chat/chatter/add_by_link?link_token=772jd4f1-cd91-441e-a820-498c6614126a).) --------- Signed-off-by: 0oshowero0 <o0shower0o@outlook.com>

update TQ version

b526544

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add TQ_ZERO_COPY_SERIALIZATION env

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wuxibin89 reviewed Dec 8, 2025

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del requirements_transferqueue.txt

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0oshowero0 force-pushed the han/update_tq branch from 72a06db to b68ac8e Compare December 12, 2025 01:44

fix

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0oshowero0 force-pushed the han/update_tq branch from 34df346 to 319396d Compare December 13, 2025 13:38

0oshowero0 added 4 commits December 15, 2025 10:02

add logger & optimize batchmeta usage

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fix

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fix

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fix

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fix

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wuxibin89 approved these changes Dec 15, 2025

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wuxibin89 merged commit baf3a63 into verl-project:main Dec 15, 2025
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0oshowero0 deleted the han/update_tq branch December 17, 2025 09:32

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[data] feat: TransferQueue - Add zero-copy serialization support & usage improvement#4429

[data] feat: TransferQueue - Add zero-copy serialization support & usage improvement#4429
wuxibin89 merged 9 commits intoverl-project:mainfrom
TransferQueue:han/update_tq

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		@@ -1,2 +1,2 @@
		# requirements.txt records the full set of dependencies for development
		TransferQueue==0.1.2.dev0

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