fix(health): normalize process CPU percent by core count by luwanglin · Pull Request #1236 · rohitg00/agentmemory

luwanglin · 2026-08-21T14:48:02Z

What

process.cpuUsage() deltas are single-core scale (one fully busy core = 100), but the CPU thresholds in thresholds.ts (cpuWarnPercent: 80 / cpuCriticalPercent: 90) express a share of the whole machine. This extracts the calculation into computeProcessCpuPercent() and normalizes by core count, so cpu.percent means percent of total machine capacity.

Why

On multi-core hosts, any burst past ~0.9 cores flipped /agentmemory/health to status: "critical" (cpu_critical_116%) even when the machine was almost idle overall. Observed on a 16-core Linux host running 0.9.29: the process idles at ~7% of capacity and bursts to ~120% (1.2 of 16 cores) during compress/summarize waves — normal background work reported as critical. Health consumers that gate on ok/healthy then treat a healthy server as down.

Single-core hosts are unaffected (divide by 1).

How to verify

npx vitest run test/health-monitor-cpu.test.ts   # new: normalization + severity mapping
npm test                                          # full suite: 152 files / 1663 tests pass
npm run build                                     # clean

New tests cover: one busy core on 16 cores → ~6.25% (healthy), all cores saturated → 100% (critical), single-core back-compat, and degenerate inputs.

Related: #1223 (health critical noise), #226 (configurable thresholds — complementary; this fixes the scale mismatch itself).

Fixes #1235

Summary by CodeRabbit

Bug Fixes
- Improved CPU health reporting on multi-core machines by normalizing process usage against available CPU cores.
- Prevented invalid elapsed-time or core-count values from producing incorrect CPU percentages.
- Updated health severity detection to better reflect near-total machine CPU saturation.
Tests
- Added coverage for CPU percentage calculations and health status thresholds across single- and multi-core systems.

process.cpuUsage() deltas are single-core scale (one busy core = 100), but the cpu thresholds in thresholds.ts express a share of the whole machine. On an N-core host any burst past ~0.9 cores reported cpu_critical even when the machine was almost idle overall (e.g. 1.2 of 16 cores -> critical at ~7% of total capacity). Extract computeProcessCpuPercent() and divide by core count so cpu.percent means percent of total machine capacity, keeping the existing 80/90 warn/critical thresholds meaningful on wide hosts. Single-core hosts are unaffected. Fixes rohitg00#1235 Signed-off-by: luwanglin <luwanglin@users.noreply.github.com>

vercel · 2026-08-21T14:48:07Z

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coderabbitai · 2026-08-21T14:48:30Z

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📝 Walkthrough

Walkthrough

The health monitor now normalizes process CPU usage by machine core count. It returns zero for invalid elapsed time or core counts. Tests cover CPU calculations and health severity on multi-core hosts.

Changes

Process CPU normalization

Layer / File(s)	Summary
CPU calculation and health integration `src/health/monitor.ts`	Adds `computeProcessCpuPercent` and uses it for health CPU reporting. The calculation accounts for core count and returns zero for invalid inputs.
CPU normalization tests `test/health-monitor-cpu.test.ts`	Tests setup, single-core and multi-core CPU percentages, invalid inputs, and CPU severity thresholds on a 16-core host.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 36cf0

The change normalizes process CPU usage by machine core count so health thresholds reflect total capacity; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 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%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes implement CPU normalization and severity behavior required by issue `#1235`, including multicore and degenerate-input coverage.
Out of Scope Changes check	✅ Passed	The code and tests are limited to CPU percentage normalization and health severity behavior related to issue `#1235`.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: normalizing process CPU percentage by core count.

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Inline comments:
In `@src/health/monitor.ts`:
- Around line 8-16: Remove the explanatory block comment above
computeProcessCpuPercent, leaving the implementation unchanged and relying on
the exported helper name to convey its purpose.

In `@test/health-monitor-cpu.test.ts`:
- Around line 1-4: Add the required vi.mock("iii-sdk") setup in the test module,
providing mocks for sdk.trigger, kv.get, kv.set, and kv.list while preserving
the existing health-monitor test imports and behavior.

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Address CodeRabbit review: repo guidelines disallow WHAT comments in src, and test files should declare the standard iii-sdk mock even when the import chain only references it type-only. Signed-off-by: luwanglin <luwanglin@users.noreply.github.com>

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Inline comments:
In `@test/health-monitor-cpu.test.ts`:
- Line 3: Complete the iii-sdk mock in the test setup by defining isolated mocks
for sdk.trigger, kv.get, kv.set, and kv.list within vi.mock("iii-sdk"), while
preserving the existing test behavior and module isolation.

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luwanglin · 2026-08-22T09:59:39Z

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coderabbitai · 2026-08-22T09:59:46Z

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luwanglin mentioned this pull request Aug 21, 2026

feat(health): make health monitor thresholds configurable via env vars #1237

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Comment thread test/health-monitor-cpu.test.ts Outdated

test(health): fill in iii-sdk mock surface per review

36cf02d

Signed-off-by: luwanglin <luwanglin@users.noreply.github.com>

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fix(health): normalize process CPU percent by core count - #1236

fix(health): normalize process CPU percent by core count#1236
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