chore: fix QA bugs in documentation/readmes

[athreesh]

Overview:

Details:

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Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• closes GitHub issue: #xxx

Summary by CodeRabbit

• Documentation

  • Improved organization and clarity in main and example README files, highlighting framework support and updating installation instructions for SGLang.
  • Fixed and standardized documentation links in backend READMEs to ensure correct navigation to architecture docs.
  • Removed duplicate content and reorganized prerequisite sections for better readability.

• Chores

  • Updated Dockerfiles to adjust Python package installation steps and environment variable settings for SGLang and Wideep images.

• Refactor

  • Modularized and improved port allocation logic for vLLM backend, introducing a dedicated port management utility for safer and more configurable distributed deployments.

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📥 Commits

Reviewing files that changed from the base of the PR and between 57482dc and 5d4b3ca.

📒 Files selected for processing (9)

• README.md (2 hunks)
• components/backends/sglang/README.md (1 hunks)
• components/backends/trtllm/README.md (1 hunks)
• components/backends/vllm/README.md (1 hunks)
• components/backends/vllm/src/dynamo/vllm/args.py (5 hunks)
• components/backends/vllm/src/dynamo/vllm/ports.py (1 hunks)
• container/Dockerfile.sglang (1 hunks)
• container/Dockerfile.sglang-wideep (1 hunks)
• examples/README.md (2 hunks)

🧰 Additional context used

🧠 Learnings (6)

components/backends/trtllm/README.md (1)

Learnt from: dmitry-tokarev-nv
PR: #2179
File: docs/support_matrix.md:61-63
Timestamp: 2025-07-30T00:34:35.810Z
Learning: In docs/support_matrix.md, the NIXL version difference between runtime dependencies (0.5.0) and build dependencies (0.4.0) is intentional and expected, not an error that needs to be corrected.

container/Dockerfile.sglang (1)

Learnt from: grahamking
PR: #1177
File: container/Dockerfile.vllm:102-105
Timestamp: 2025-05-28T22:54:46.875Z
Learning: In Dockerfiles, when appending to environment variables that may not exist in the base image, Docker validation will fail if you reference undefined variables with ${VARIABLE} syntax. In such cases, setting the environment variable directly (e.g., ENV CPATH=/usr/include) rather than appending is the appropriate approach.

README.md (2)

Learnt from: dmitry-tokarev-nv
PR: #2179
File: docs/support_matrix.md:61-63
Timestamp: 2025-07-30T00:34:35.810Z
Learning: In docs/support_matrix.md, the NIXL version difference between runtime dependencies (0.5.0) and build dependencies (0.4.0) is intentional and expected, not an error that needs to be corrected.

Learnt from: biswapanda
PR: #1412
File: lib/bindings/python/src/dynamo/runtime/logging.py:100-100
Timestamp: 2025-06-06T21:48:35.214Z
Learning: In the Dynamo codebase, BentoML has been completely removed from all executable code, with only documentation and attribution references remaining. The error_loggers configuration in lib/bindings/python/src/dynamo/runtime/logging.py should not include "bentoml" since those modules no longer exist.

components/backends/vllm/README.md (1)

Learnt from: dmitry-tokarev-nv
PR: #2179
File: docs/support_matrix.md:61-63
Timestamp: 2025-07-30T00:34:35.810Z
Learning: In docs/support_matrix.md, the NIXL version difference between runtime dependencies (0.5.0) and build dependencies (0.4.0) is intentional and expected, not an error that needs to be corrected.

components/backends/sglang/README.md (1)

Learnt from: dmitry-tokarev-nv
PR: #2179
File: docs/support_matrix.md:61-63
Timestamp: 2025-07-30T00:34:35.810Z
Learning: In docs/support_matrix.md, the NIXL version difference between runtime dependencies (0.5.0) and build dependencies (0.4.0) is intentional and expected, not an error that needs to be corrected.

examples/README.md (1)

Learnt from: PeaBrane
PR: #1409
File: examples/router_standalone/worker.py:171-186
Timestamp: 2025-06-08T08:30:45.126Z
Learning: Example code in the examples/ directory may intentionally use hard-coded values or simplified implementations that wouldn't be appropriate for production code, but are acceptable for demonstration and testing purposes.

🧬 Code Graph Analysis (1)

components/backends/vllm/src/dynamo/vllm/args.py (1)

components/backends/vllm/src/dynamo/vllm/ports.py (7)

• DynamoPortRange (26-40)
• EtcdContext (44-53)
• PortAllocationRequest (78-85)
• PortMetadata (57-74)
• allocate_and_reserve_port (229-260)
• allocate_and_reserve_port_block (142-226)
• get_host_ip (263-290)

🔇 Additional comments (15)

components/backends/vllm/src/dynamo/vllm/ports.py (4)

25-40: Well-designed port range validation.

The dataclass correctly validates port ranges within the registered ports section (1024-49151) and ensures min < max. This prevents common configuration errors.

---

116-123: Clean port availability check.

The function correctly tests port availability without using SO_REUSEADDR, ensuring accurate availability detection.

---

142-226: Excellent atomic port block allocation implementation.

The function demonstrates robust design with:

• Proper validation of port range vs block size
• Atomic port reservation using context manager
• Randomized port selection to minimize conflicts
• Comprehensive error handling and logging
• Well-structured metadata for block allocation

---

263-290: Robust host IP detection with proper fallbacks.

The function handles multiple failure scenarios gracefully:

• Hostname resolution failures
• Non-bindable IPs
• Socket errors

The bindability test is particularly important for multi-node deployments.

components/backends/vllm/src/dynamo/vllm/args.py (3)

15-25: Clean modularization of port management utilities.

Good separation of concerns by moving port allocation logic to a dedicated module.

---

75-86: Well-documented CLI arguments for port range configuration.

The arguments provide clear help text and use appropriate defaults from the ports module.

---

146-201: Correct implementation of NIXL port allocation logic.

The function properly handles:

• Conditional KV port allocation for prefix caching
• Block allocation for tensor parallel workers
• Reverse calculation of NIXL base port from allocated ports
• Validation against negative port values

The NIXL port calculation complexity is well-documented with comments explaining the formula.

components/backends/vllm/README.md (1)

38-43: Correct link-root fix – thanks for catching this

Moving to ../../../docs/... resolves the broken links when this README is opened from GitHub’s UI and when rendered inside the container.
No further action needed.

components/backends/trtllm/README.md (1)

52-57: Link path correction looks good

Same adjustment as in the vLLM README; links now resolve from the trtllm folder.
All good.

components/backends/sglang/README.md (1)

37-42: Consistent doc links – LGTM

The extra ../ fixes the 404s.
Nothing else to flag.

container/Dockerfile.sglang-wideep (1)

123-125: Removal of editable install may break live-code override

pip install . bakes the code into site-packages.
If downstream dev images relied on live-editing the source tree inside the container (e.g., hot-reload during interactive debugging) this change will stop working.
Please confirm the workflow does not expect editable mode here.

examples/README.md (1)

25-33: Confirm that added links resolve correctly from examples/ context

The new Framework Support list uses relative paths such as ../components/backends/vllm/.
From examples/README.md this resolves to <repo-root>/components/backends/vllm/, which is correct.
No action required.

README.md (3)

24-24: Navigation row looks good

The added Support Matrix link improves discoverability.

---

41-46: LGTM – contextual links are correct

The bullet links to backend READMEs are repository-relative and render correctly.

---

170-179: Confirm uv pip prerelease flag
The docs currently use --prerelease=allow, but uv pip may only support pip’s --pre flag. Please test in your environment which flag is accepted before merging.

Affected location:

• README.md (lines 170–179)

If --pre is required, update to:

- uv pip install "flashinfer-python==0.2.9rc2" --prerelease=allow
+ uv pip install --pre "flashinfer-python==0.2.9rc2"

Walkthrough

This update reorganizes and clarifies documentation across several README files, corrects relative documentation links, and improves SGLang installation instructions. It also introduces a new modular port allocation utility for Dynamo, refactors port allocation logic in the vLLM backend to use this utility, and updates Dockerfiles for SGLang backends to adjust Python package installation steps.

Changes

Cohort / File(s)	Change Summary
Documentation Reorganization & Clarification README.md, examples/README.md	Moved and consolidated "Framework Support Matrix" and related sections for better clarity; improved SGLang installation instructions; removed duplicated framework support info in examples README.
Docs Link Correction in Backend READMEs components/backends/sglang/README.md, components/backends/trtllm/README.md, components/backends/vllm/README.md	Updated relative documentation links in feature support matrices from two-level to three-level paths to ensure correct navigation.
Port Allocation Refactor & Abstraction components/backends/vllm/src/dynamo/vllm/args.py, components/backends/vllm/src/dynamo/vllm/ports.py	Extracted and modularized port allocation/reservation logic into a new ports.py module; refactored vLLM backend to use these abstractions and added explicit port range configuration.
Dockerfile Installation Adjustments container/Dockerfile.sglang, container/Dockerfile.sglang-wideep	Updated SGLang Dockerfile to install a specific pre-release dependency before ai-dynamo[sglang]; removed editable install flag in wideep Dockerfile.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant vLLM Args Parser
    participant Ports Module
    participant ETCD

    User->>vLLM Args Parser: Launch backend with CLI args
    vLLM Args Parser->>Ports Module: Request port allocation (with range, size)
    Ports Module->>Ports Module: Hold and check port(s) availability
    Ports Module->>ETCD: Reserve port(s) with metadata
    ETCD-->>Ports Module: Confirm reservation
    Ports Module-->>vLLM Args Parser: Return allocated port(s)
    vLLM Args Parser-->>User: Proceed with configured ports

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Possibly related PRs

• fix: add better port logic (#2175) #2192: Refactors port allocation in args.py to use the new ports module, directly related to the main port allocation logic changes.
• chore: address QA broken links comments #2184: Updates documentation links in backend README files, matching the link correction changes in this PR.
• fix(container): update sgl dockerfile install commands #2194: Modifies container/Dockerfile.sglang installation steps, directly related to Dockerfile changes here.

Poem

In README fields where docs align,
And ports are claimed in tidy lines,
With Docker builds and links anew,
Our backend hops with clearer view.
From vLLM to SGLang’s lair,
This bunny’s proud of changes there!
🐇✨

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