[Doc] Troubleshooting: add a WSL2 section (pinned memory gates, lingering workers) - #50784
[Doc] Troubleshooting: add a WSL2 section (pinned memory gates, lingering workers)#50784manunicholasjacob wants to merge 1 commit into
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…worker shutdown) Documents the two vLLM-specific WSL2 gotchas -- the off-by-default VLLM_WSL2_ENABLE_PIN_MEMORY opt-in (defined in envs.py but undocumented) and lingering worker processes after shutdown -- with brief pointers to the general WSL networking/memory caveats. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: Manu Nicholas Jacob <manunicholasjacob@gmail.com>
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Documentation preview: https://vllm--50784.org.readthedocs.build/en/50784/ |
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Purpose
Adds a short WSL2 section to the troubleshooting guide covering two
vLLM-specific behaviors that are currently undocumented, plus brief pointers to
the general WSL caveats that come up in vLLM reports (#31124, #49861, #41933,
#41619, #39093).
Pinned host memory.
VLLM_WSL2_ENABLE_PIN_MEMORYis defined invllm/envs.pybut appears nowhere in the docs, and the behavior behind it hastwo separate gates that are easy to conflate. In
CudaPlatformBase.is_pin_memory_available(), pinned memory is refused outrighton WSL2 kernels below
4.19.121— the environment variable has no effect thereand the fix is
wsl --update— while on newer kernels it is supported but leftdisabled by default, so it needs an explicit opt-in. A user who sees
Using 'pin_memory=False' as WSL is detectedcurrently has no documented way totell which of the two situations they are in.
Lingering workers after shutdown. Reported in #39093: Ctrl+C prints a clean
shutdown while worker processes keep holding the GPU and port, so the next start
fails with the address already in use. The section records
pkill -f -9 vllmasthe workaround and links the open issue rather than presenting it as intended
behavior.
The closing paragraph is deliberately brief: mirrored networking for reaching a
0.0.0.0server from Windows, and.wslconfigmemory=/MAX_JOBSlimitingguest RAM and build parallelism.
Docs-only; no code or behavior changes.
Test Plan
pre-commit run --files docs/usage/troubleshooting.md.4.19.121gate and the default-off behavior are read fromvllm/platforms/cuda.py::is_pin_memory_available, and the env var defaultfrom
vllm/envs.py.Test Result
pre-commitpasses on the changed file (markdownlint Passed; code hooks reportno files to check, as expected for a docs-only change).
This PR was developed with AI assistance (Claude); I reviewed, adapted, and
verified the change myself.