Pin uvloop to 0.21.0

[yeahdongcn]

Motivation

When running examples/runtime/engine/launch_engine.py on the musa platform, I encountered the following error:

Loading safetensors checkpoint shards:   0% Completed | 0/4 [00:00<?, ?it/s]
Loading safetensors checkpoint shards:  25% Completed | 1/4 [00:00<00:01,  2.06it/s]
Loading safetensors checkpoint shards:  50% Completed | 2/4 [00:00<00:00,  2.18it/s]
Loading safetensors checkpoint shards:  75% Completed | 3/4 [00:01<00:00,  3.19it/s]
Loading safetensors checkpoint shards: 100% Completed | 4/4 [00:01<00:00,  3.63it/s]
Loading safetensors checkpoint shards: 100% Completed | 4/4 [00:01<00:00,  3.12it/s]

Capturing batches (bs=1 avail_mem=3.99 GB): 100%|████████████████████████████| 23/23 [01:32<00:00,  4.04s/it]
Traceback (most recent call last):
  File "/ws/examples/runtime/engine/launch_engine.py", line 17, in <module>
    # The __main__ condition is necessary here because we use "spawn" to create subprocesses
  File "/ws/examples/runtime/engine/launch_engine.py", line 10, in main
    trust_remote_code=True,
  File "/ws/python/sglang/srt/entrypoints/engine.py", line 204, in generate
    loop = asyncio.get_event_loop()
  File "/usr/local/lib/python3.10/dist-packages/uvloop/__init__.py", line 206, in get_event_loop
    raise RuntimeError(
RuntimeError: There is no current event loop in thread 'MainThread'.

It turned out to be an issue related to uvloop: MagicStack/uvloop#702

Modifications

Pin uvloop to 0.21.0.

Accuracy Tests

N/A

Benchmarking and Profiling

N/A

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.

[gemini-code-assist]

Summary of Changes

Hello @yeahdongcn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a RuntimeError related to the uvloop library, specifically "There is no current event loop in thread 'MainThread'", which occurred during the execution of an example script on the musa platform. The fix involves explicitly setting the uvloop dependency to version 0.21.0 in the project's dependency configuration files, ensuring stability and preventing the reported event loop issue.

Highlights

• Dependency Pinning: Pinning the uvloop dependency to version 0.21.0 across all pyproject.toml files to resolve a RuntimeError encountered when running examples/runtime/engine/launch_engine.py on the musa platform.

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[gemini-code-assist]

Code Review

This pull request correctly pins uvloop to version 0.21.0 to resolve a runtime error, as described. The change is applied consistently across all relevant pyproject.toml configuration files. I've added one comment regarding dependency management that could improve long-term maintainability, but it's a suggestion for future work and doesn't block this important fix.

[gemini-code-assist]

While pinning uvloop here and in the other pyproject*.toml files correctly fixes the issue, I've noticed that many dependencies are duplicated across pyproject.toml, pyproject_cpu.toml, and pyproject_xpu.toml. This increases maintenance overhead, as any dependency update needs to be manually synchronized across multiple files (as was done in this PR).

To improve maintainability, I suggest refactoring to centralize the common dependencies. The approach in pyproject_other.toml, which uses a [project.optional-dependencies].runtime_common group, is a good example of how this could be structured. Adopting a similar pattern for all configurations would make dependency management much easier.

This is a suggestion for a future improvement and does not need to be addressed in this PR.