[vllm] enable mp distributed executor backend (no multi-node engines) with per engine placement groups #560

	name: SkyRL-CPU

	on:
	push:
	branches: [ main ]
	paths:
	- 'ci/**'
	- 'skyrl/**'
	- 'tests/**'
	- 'pyproject.toml'
	- '.github/workflows/cpu_skyrl.yaml'
	pull_request:
	paths:
	- 'ci/**'
	- 'skyrl/**'
	- 'tests/**'
	- 'pyproject.toml'
	- '.github/workflows/cpu_skyrl.yaml'
	workflow_dispatch:

	permissions:
	checks: write # for status checks to appear
	contents: read

	# Cancel runs for previous commits on the same branch
	concurrency:
	group: skyrl-${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	skyrl_tests:
	runs-on: ubuntu-latest
	defaults:
	run:
	shell: bash
	working-directory: .
	steps:
	- uses: actions/checkout@v4
	- name: Install uv
	run: \|
	curl -LsSf https://astral.sh/uv/install.sh \| sh
	- name: Run lint
	run: \|
	uvx ruff check
	- name: Run pytest
	run: \|
	# Note: Qwen 3.5 currently needs transformers v5, but we are not ready to fully migrate to it yet
	uv run --extra tinker --extra jax --extra dev --with transformers==5.2.0 pytest --forked -s tests/tx/models/test_qwen3_5.py
	uv run --extra tinker --extra jax --extra dev pytest --forked -s tests --ignore=tests/tx/gpu --ignore=tests/train --ignore=tests/backends/skyrl_train --ignore=tests/tx/models/test_qwen3_5.py
	- name: Run engine benchmarks
	run: \|
	uv run --extra tinker --extra dev python skyrl/benchmarks/benchmark_engine.py --base-model trl-internal-testing/tiny-Qwen3ForCausalLM --backend-config '{"max_lora_adapters": 3, "max_lora_rank": 1}' --num-warmup-steps 1 --num-steps 1 --num-requests 1 --seq-len 8 --sample-max-tokens 16

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