Add vLLM-metax vllm metax env diff report

[ghangz]

Summary

• Adds a focused vllm metax env diff report improvement for MetaX-MACA/vLLM-metax.
• The change targets MetaX MACA development and validation workflows, with emphasis on earlier diagnostics, reproducible logs, or safer benchmark tooling.
• Existing default behavior is kept compatible; the new logic is scoped to explicit checks, helper tools, or validation metadata.

Validation

• Verified on Gitee.AI MetaX GPU resources: vLLM-metax_vLLM image batch, 10/10 PASS; PyTorch-MACA batch also covered vLLM-metax runtime tools.
• Branch validation command: python tools/maca_env_diff.py --self-test x y
• Pull request text is intentionally ASCII-only to avoid encoding issues on web forms and API clients.

Review notes

• Source branch: ghangz:mengz/vllm-metax-env-diff-report
• Target branch: MetaX-MACA/vLLM-metax:master
• Maintainers can modify this branch if follow-up adjustments are needed.

[gemini-code-assist]

Code Review

This pull request introduces a new Python script, tools/maca_env_diff.py, designed to compare two MACA runtime environment reports and output a compact JSON diff. The review feedback highlights an issue where the required positional arguments before and after force users to provide dummy arguments when running the script with the --self-test flag. It is recommended to make these positional arguments optional and manually validate their presence when --self-test is not active.

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[gemini-code-assist]

The positional arguments before and after are currently required by default. This forces the user to provide dummy positional arguments (e.g., python tools/maca_env_diff.py --self-test x y) when running with the --self-test flag, which is counter-intuitive and error-prone.

By making the positional arguments optional using nargs="?" and manually validating their presence when --self-test is not specified, we can support running --self-test cleanly without any dummy arguments.

Suggested change

	parser.add_argument("before")
	parser.add_argument("after")
	parser.add_argument("--self-test", action="store_true")
	args = parser.parse_args()
	if args.self_test:
	self_test()
	return 0
	print(json.dumps(diff(load(Path(args.before)), load(Path(args.after))), ensure_ascii=False, indent=2))
	parser.add_argument("before", nargs="?")
	parser.add_argument("after", nargs="?")
	parser.add_argument("--self-test", action="store_true")
	args = parser.parse_args()
	if args.self_test:
	self_test()
	return 0
	if not args.before or not args.after:
	parser.error("the following arguments are required: before, after")
	print(json.dumps(diff(load(Path(args.before)), load(Path(args.after))), ensure_ascii=False, indent=2))