fix(memory): derive heap limit from real V8 heap statistics - #3775
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📝 WalkthroughWalkthroughThe change adds cross-runtime V8 heap-limit detection and integrates it into memory profiling. Runtime limits take precedence over configured values, while invalid or unavailable values use a 2,048 MB fallback. Related API source links are updated. ChangesHeap limit resolution
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The change derives heap limits from runtime statistics and conservatively falls back to 2048 MB when verification is unavailable. The PR is mergeable with explicit owner follow-up because one test should assert the exact 2048 MB fallback rather than accepting any lower value. Sequence Diagram(s)sequenceDiagram
participant getHeapStats
participant resolveEffectiveHeapLimitMB
participant getV8HeapSizeLimit
participant nodev8
getHeapStats->>resolveEffectiveHeapLimitMB: provide configured heap limit
resolveEffectiveHeapLimitMB->>getV8HeapSizeLimit: request runtime limit
getV8HeapSizeLimit->>nodev8: read heap_size_limit
nodev8-->>getV8HeapSizeLimit: return heap limit in bytes
getV8HeapSizeLimit-->>resolveEffectiveHeapLimitMB: return runtime limit
resolveEffectiveHeapLimitMB-->>getHeapStats: return effective limit in MB
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📦 Client bundle boundary
A server module in a client graph aborts hydration in the browser. New leaks fail CI; known leaks are tracked in |
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getConfiguredHeapLimit() trusted the DENO_V8_FLAGS env string as the real V8 heap limit. In production the compiled binary does not apply that flag, so the profiler reported heapLimitMB 4096 while V8 aborted at its ~2048MB default — heapUsedPercent was ~2x too low and the memory-pressure eviction threshold could mathematically never fire (veryfront-issue-inbox#269). Read the real limit from node:v8 getHeapStatistics().heap_size_limit via a new platform compat accessor. When runtime heap statistics are unavailable, treat env-derived limits as unverified and clamp them to the 2048MB V8 default so pressure eviction fires before the real ceiling.
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Addressed the Bun compatibility review in The lifecycle accessor now follows the existing cross-runtime builtin-loading contract: use Verification:
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Inline comments:
In `@src/utils/memory/profiler.test.ts`:
- Around line 118-128: Update the assertion in the “clamps an unverified
DENO_V8_FLAGS limit to the V8 default ceiling” test to require effective ===
2048, preserving the existing diagnostic message and resolveEffectiveHeapLimitMB
setup.
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docs/api-reference/veryfront/extensions.mddocs/api-reference/veryfront/fs.mddocs/api-reference/veryfront/testing.mdsrc/platform/compat/process.tssrc/platform/compat/process/lifecycle.test.tssrc/platform/compat/process/lifecycle.tssrc/utils/memory/profiler.test.tssrc/utils/memory/profiler.ts
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Addressed both fresh review findings in The important correction is Bun-specific: Bun uses JavaScriptCore, and its Also tightened the fallback assertion from “at most 2,048” to exactly 2,048. Red-green evidence:
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Fixed the CI lint failure in Verification:
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Problem
getConfiguredHeapLimit()derived the reported heap limit by parsing the--max-old-space-sizevalue out of theDENO_V8_FLAGSenvironment string. That value is only a request, not a fact: when the flag is not actually applied by the runtime, V8 stays at its default old-space ceiling (~2 GB on 64-bit) while the profiler keeps reporting the env-derived figure (e.g. 4096 MB).The consequences compound:
heapUsedPercentis computed against an inflated denominator, so it reads roughly half the real value.Fix
node:v8getHeapStatistics().heap_size_limit.resolveEffectiveHeapLimitMB()prefers the runtime-reported limit whenever it is available.Tests
DENO_V8_FLAGSenv string.resolveEffectiveHeapLimitMB(): runtime-verified value trusted as-is, unverified env value clamped to the V8 default, fallback when nothing is configured, and pressure evaluation crossing the eviction threshold at ~1.6 GB used under a clamped limit.Ref: veryfront-issue-inbox#269
Summary by CodeRabbit
Bug Fixes
Documentation
Tests