fix(gpu): detect Jetson Thor and Orin unified memory GPUs

[kagura-agent]

Summary

Closes #300

The unified-memory fallback in detectGpu() only checked for "GB10" (DGX Spark). Jetson Thor and Orin report different chip names via nvidia-smi --query-gpu=name, causing GPU detection to fail and fallback to cloud inference.

Changes

bin/lib/nim.js

• Extract UNIFIED_MEMORY_CHIPS = ["GB10", "Thor", "Orin", "Xavier"] constant
• Use .some(chip => nameOutput.includes(chip)) instead of .includes("GB10")
• Add unifiedMemory: true and name properties to the return object
• Keep spark property true only for GB10 (backward compat)

test/nim-jetson.test.js (new)

• 11 unit tests covering:
  • Chip name matching for Thor, Orin, GB10, Xavier
  • Real-world nvidia-smi output strings ("Orin (nvgpu)", "NVIDIA Thor", "Orin Nano")
  • Negative cases (RTX 4090, A100, H100 should NOT match)
  • spark flag logic
  • Multi-line name extraction

Testing

All 54 tests pass (43 existing + 11 new):

npm test

Notes

• Xavier is included defensively for older Jetson platforms with unified memory
• No TypeScript changes needed — detectGpu only exists in bin/lib/nim.js
• Compatible with PR test: add GPU detection tests with dependency injection #142 (DI refactor) — can be rebased if needed

Summary by CodeRabbit

• New Features

  • Broader detection and handling of unified-memory GPUs across several chip families.
  • Detection now reports unifiedMemory, extracts the primary device name line, and sets a special-case flag only for the specific GB10 family.
  • Improved memory sizing for unified-memory devices using system RAM information.

• Tests

  • Added tests covering chip-family matching, name extraction, special-case flag behavior, and negative matching.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Reviewing files that changed from the base of the PR and between 89e5cc6 and 752f1af.

📒 Files selected for processing (2)

• bin/lib/nim.js
• test/nim-jetson.test.js

✅ Files skipped from review due to trivial changes (1)

• test/nim-jetson.test.js

🚧 Files skipped from review as they are similar to previous changes (1)

• bin/lib/nim.js

---

📝 Walkthrough

Walkthrough

Adds and exports a frozen UNIFIED_MEMORY_CHIPS list (GB10, Thor, Orin, Xavier), extends GPU detection fallback to match those names (case-insensitive), marks unified-memory GPUs and computes memory from system RAM, preserves spark only for GB10, and adds unit tests for matching and name extraction.

Changes

Cohort / File(s)	Summary
GPU Detection Logic bin/lib/nim.js	Add and export UNIFIED_MEMORY_CHIPS (["GB10","Thor","Orin","Xavier"]); extend unified-memory fallback to match any listed chip (case-insensitive); set unifiedMemory: true; compute totalMemoryMB from system RAM for unified devices; set spark only when name contains gb10; adjust returned name to first line of nvidia-smi output.
Test Coverage test/nim-jetson.test.js	New tests verifying UNIFIED_MEMORY_CHIPS contents, substring matching behavior for Jetson/DGX name variants (GB10, Thor, Orin, Xavier), negative matches for discrete GPUs, spark derivation for GB10 only, and first-line name extraction.

Sequence Diagram(s)

sequenceDiagram
  participant CLI as Node CLI
  participant lib as nim.detectGpu()
  participant nvsmi as nvidia-smi
  participant OS as System RAM

  CLI->>lib: invoke detectGpu()
  lib->>nvsmi: query name & memory
  alt nvidia-smi returns usable memory
    nvsmi-->>lib: memory, name
    lib-->>CLI: GPU descriptor (discrete)
  else nvidia-smi memory is [N/A]
    nvsmi-->>lib: name only
    lib->>lib: match name against UNIFIED_MEMORY_CHIPS
    alt match found
      lib->>OS: read total system RAM
      OS-->>lib: totalMemoryMB
      lib-->>CLI: GPU descriptor (unifiedMemory: true, spark if gb10)
    else no match
      lib-->>CLI: assume no GPU (CPU-only)
    end
  end

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hopped through names — GB10, Thor, Orin, Xavier,
now unified chips are spotted in the field.
From nvidia-smi whispers to system RAM's hum,
no more missed GPUs — I dance, I yield.
🥕

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: extending GPU detection to recognize Jetson Thor and Orin unified memory GPUs, which is the core objective.
Linked Issues check	✅ Passed	The PR implementation fully addresses issue #300 by extending unified-memory GPU detection beyond GB10 to include Thor, Orin, and Xavier chips with case-insensitive matching.
Out of Scope Changes check	✅ Passed	All changes are scoped to the GPU detection feature: the constant definition, detection logic updates, and comprehensive test coverage with no unrelated modifications.

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[coderabbitai]

🧹 Nitpick comments (1)

bin/lib/nim.js (1)

59-59: Consider case-insensitive matching for robustness.

The current substring check is case-sensitive. While nvidia-smi typically returns consistent casing, a case-insensitive match would be more defensive against unexpected output variations.

♻️ Suggested change for case-insensitive matching

-    if (nameOutput && UNIFIED_MEMORY_CHIPS.some((chip) => nameOutput.includes(chip))) {
+    if (nameOutput && UNIFIED_MEMORY_CHIPS.some((chip) => nameOutput.toLowerCase().includes(chip.toLowerCase()))) {

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@bin/lib/nim.js` at line 59, The substring check against UNIFIED_MEMORY_CHIPS
is currently case-sensitive; update the condition that uses nameOutput and
UNIFIED_MEMORY_CHIPS (the if with nameOutput && UNIFIED_MEMORY_CHIPS.some(...))
to perform a case-insensitive comparison by normalizing both sides (e.g., call
toLowerCase() on nameOutput and on each chip string or use a case-insensitive
regex) before calling includes/some, and keep the existing null/undefined guard
for nameOutput.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@bin/lib/nim.js`:
- Line 59: The substring check against UNIFIED_MEMORY_CHIPS is currently
case-sensitive; update the condition that uses nameOutput and
UNIFIED_MEMORY_CHIPS (the if with nameOutput && UNIFIED_MEMORY_CHIPS.some(...))
to perform a case-insensitive comparison by normalizing both sides (e.g., call
toLowerCase() on nameOutput and on each chip string or use a case-insensitive
regex) before calling includes/some, and keep the existing null/undefined guard
for nameOutput.

---

ℹ️ Review info

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• bin/lib/nim.js
• test/nim-jetson.test.js

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@bin/lib/nim.js`:
- Line 71: The spark flag uses case-sensitive matching
(nameOutput.includes("GB10")) which is inconsistent with the earlier
case-insensitive chip detection that uses toLowerCase(); change spark to perform
a case-insensitive check (e.g., use nameOutput.toLowerCase().includes("gb10"))
so both unified memory detection and the spark flag behave consistently; update
the expression that sets spark accordingly (reference: the spark assignment and
the earlier toLowerCase() usage).

---

ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Reviewing files that changed from the base of the PR and between 0913f8e and a148165.

📒 Files selected for processing (1)

• bin/lib/nim.js

[kagura-agent]

Addressed both CodeRabbit review comments in 89e5cc6:

1. Line 59 (nitpick) — case-insensitive chip detection was already applied in the initial commit (nameOutput.toLowerCase().includes(chip.toLowerCase())).
2. Line 71 (spark flag) — now uses nameOutput.toLowerCase().includes("gb10") for consistent case-insensitive matching. Updated test to cover mixed-case variants (gb10, Gb10, etc.).

All 54 tests pass.

[coderabbitai]

🧹 Nitpick comments (1)

bin/lib/nim.js (1)

26-27: Consider freezing the exported array to prevent accidental mutation.

Since UNIFIED_MEMORY_CHIPS is exported and could be used by external consumers, making it immutable prevents accidental modifications that could affect detection logic.

♻️ Optional: freeze the constant

 // Chip names that use unified memory (VRAM not separately queryable)
-const UNIFIED_MEMORY_CHIPS = ["GB10", "Thor", "Orin", "Xavier"];
+const UNIFIED_MEMORY_CHIPS = Object.freeze(["GB10", "Thor", "Orin", "Xavier"]);

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@bin/lib/nim.js` around lines 26 - 27, UNIFIED_MEMORY_CHIPS is a mutable
exported array which could be accidentally modified; make it immutable by
freezing it where it's declared (e.g., replace the raw array with
Object.freeze([...]) so UNIFIED_MEMORY_CHIPS is assigned to a frozen array) to
prevent runtime mutations that would break chip detection logic.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@bin/lib/nim.js`:
- Around line 26-27: UNIFIED_MEMORY_CHIPS is a mutable exported array which
could be accidentally modified; make it immutable by freezing it where it's
declared (e.g., replace the raw array with Object.freeze([...]) so
UNIFIED_MEMORY_CHIPS is assigned to a frozen array) to prevent runtime mutations
that would break chip detection logic.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a5e3b7ec-584c-4caf-89d7-70256f3df3af

📥 Commits

Reviewing files that changed from the base of the PR and between a148165 and 89e5cc6.

📒 Files selected for processing (2)

• bin/lib/nim.js
• test/nim-jetson.test.js

✅ Files skipped from review due to trivial changes (1)

• test/nim-jetson.test.js

[kagura-agent]

Re: latest CodeRabbit review — the Object.freeze() suggestion for UNIFIED_MEMORY_CHIPS is already applied in the current code (line 27: const UNIFIED_MEMORY_CHIPS = Object.freeze(["GB10", "Thor", "Orin", "Xavier"])). ✅

[kagura-agent]

Closing to reduce open PR count — I had too many PRs open, which adds review burden rather than helping. Happy to resubmit if this fix is still wanted.