Add an ink mode to the memory guard so render-path leaks fail CI (Fixes #3365) - #3368
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughAdds an ChangesInk memory mode
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The new CI guard can sample memory before all requested render frames finish, which may let a real render-path leak pass undetected; merge should wait for this bounded benchmark-correctness issue to be fixed or explicitly accepted. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Description checkExplanation The description is detailed and on-topic. It explains the motivation, implementation, testing, verification results, linked issue, and scope limitations. It does not use the template's exact headings and omits an explicit testing matrix, but it provides equivalent testing information and is mostly complete. ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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WalkthroughBefore this change, the memory guard could exercise general workloads, but it did not have a dedicated Ink render-path workload or an ink-specific memory mode, so render-path leaks could slip through CI without a targeted failure. After this PR, the memory target includes an Ink workload that drives the real streaming render path through incremental buffer processing, the memory runner accepts an ink mode and applies mode-specific metric gating and plateau verdicts, and CI can now fail on render-path leaks while still accepting pinned-fork behavior. Release NotesNew Features
Bug Fixes
Tests
Refactor
Changes
Magnitude🎯 1 (S) Related
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Walkthrough generated by LLxprt PR Review. Planner issue: #2256 |
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Inline comments:
In `@scripts/issue-2852-memory-ink.ts`:
- Around line 122-126: The renderFrames method in
scripts/issue-2852-memory-ink.ts must await completion of all Ink renders by
tracking the supported onRender callback, and its callers must await
renderFrames so checkpoints occur afterward. Update
scripts/issue-2852-memory-target.ts at lines 287-288 to await the workload call,
and add coverage that counts rendered frames.
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Triaged both findings. One was correct and more serious than reported; the other is factually wrong. Fixed: the workload was barely renderingCodeRabbit is right, and the effect is larger than the comment suggests. Measured directly: 39 out of 3,000. The mode was measuring reconciliation and layout, not the text and output path it exists to guard. Fixed by passing I did not take the suggested async/await restructuring. With the throttle off, Re-verified end to end with real rendering. The pinned fork still plateaus: This also means the throttle applied to the measurements quoted in the PR description and in #3345. The build-to-build comparison remains valid, since every build ran under identical throttling, and the plateau-versus-linear conclusion survives re-measurement. But those absolute figures reflect roughly 1.3% of the frames the workload requested, and I have corrected the record on #3345 rather than leave them reading as full-rate rendering. Rejected:
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Review remediation for PR #3368. The workload was barely rendering. `@jrichman/ink` 6.4.8 computes `maxFps = options.maxFps ?? 30` and throttles frame production, while reconciliation stays synchronous through updateContainerSync and flushSyncWork. A tight rerender loop therefore reconciles thousands of times and produces almost nothing. Measured directly on the pinned fork: default throttle : requested=3000 actuallyRendered=39 maxFps: 0 : requested=3000 actuallyRendered=3001 39 out of 3000. The mode was measuring reconciliation and layout rather than the text and output path it exists to guard. Passes maxFps: 0 to disable the throttle, and counts real frames through the supported onRender option, exposed as framesRendered(). Two tests added: one asserts one rendered frame per rerender plus the initial mount, one asserts the throttle is disabled explicitly, so a silent regression cannot put the mode back to measuring nothing. The suggested async restructuring is not taken. With the throttle off, rerender produces its frame synchronously, so awaiting would add machinery without changing behaviour; the frame count is the check that actually proves the work happened, and it is asserted. Re-verified end to end with real rendering. The pinned fork still plateaus: jscHeap +0.900%, external +0.080%, dirty WebKit Malloc 0.000%, overall within tolerance. This also means every figure measured earlier for #3345 ran under the throttle. The build-to-build comparison stays valid because all builds were throttled identically, and the plateau-versus-linear conclusion survives re-measurement, but the absolute numbers reflect roughly 1.3% of the requested frames. Refs #3365
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Third finding addressed. Agreed, and the fix is to delete rather than rewrite. OCR is right that It was also redundant. The behavioural test already covers it precisely, because the frame count collapses by roughly two orders of magnitude if throttling returns: So I kept the source assertions in Six tests now, all passing. Full verification cycle re-running. The two older threads on this PR are stale: the |
Review remediation for PR #3368. `expect(source).toContain('maxFps: 0')` asserted an implementation detail. Disabling the throttle through a constant, a helper, or a renamed option would break it while behaviour stayed correct. It was also redundant. The behavioural test already covers the same property far more precisely, because the frame count collapses by roughly two orders of magnitude if throttling returns: default throttle : requested=3000 actuallyRendered=39 maxFps: 0 : requested=3000 actuallyRendered=3001 Removed the source assertion and moved its rationale into the doc comment of `produces one rendered frame per rerender`, which is the check that actually proves the throttle is off. The source assertions in `is wired through both the target and the runner` are kept deliberately. They guard a different failure mode, a mode present in one script but not the other, and there is no cheap behavioural proxy for that short of running the whole harness inside the test. Six tests, all passing. Full verification cycle green: format, lint, build, typecheck and the entire suite with zero failures. Refs #3365
…ks fail CI (#3365) The issue-2852 harness had three modes, text, media and reasoning. All three drive PendingResponseBuffer and none renders a frame, so the post-GC plateau verdicts added by #3114 could not observe a leak in the Ink render path. That path runs continuously in the default configuration, since alternate buffer is the default. This is not hypothetical. Evaluating the upstream-ink migration (#3345), an isolated styled-character-cache benchmark suggested fork 7.1.0 was ~69x better than the pinned 6.4.8 and pointed towards a version bump. Rendering the real alternate-buffer shape reversed it: the pin plateaus while both candidate upgrade targets grow without bound, and nothing in CI would have failed on the regression. Adds: - scripts/issue-2852-memory-ink.ts, which mounts the AlternateBufferLayout shape (terminal-sized, overflow hidden, no <Static>) and re-renders it with distinct content per frame. It imports the real `ink` package rather than a stub, so whatever the repository resolves `ink` to is what gets measured; a dependency swap changes the subject of the measurement, which is the point. One mount is reused across turns, because remounting per turn would reset renderer state and hide the accumulation the mode exists to detect. - `ink` wired through the target and the runner, routed to evaluateMultiMetricPlateau rather than the JSC-heap-only verdict. Measurement showed candidates failing on JSC heap, external and dirty WebKit Malloc simultaneously, and a heap-only check would accept a build whose native memory runs away. Verified end to end. Running `bun scripts/issue-2852-memory-runner.ts DIR ink 5` against the pinned fork passes: jscHeap +0.8%, external +0.14%, dirty WebKit Malloc 0%. Tests feed the actual measured series from both builds into the verdict rather than depending on a leaking package being installed, so they are deterministic and run in CI. The pinned series passes; the fork 7.1.0 series (footprint climbing ~210 MB per turn to 2.15 GB by turn 10) fails on all three metrics. A third case pins that native growth is rejected even when the JS heap is flat, and two more assert the mode is wired through both scripts and that the workload renders the default-mode shape. tsconfig.scripts.json gains the new module, the benchmark it imports, and the test. The target and runner stay excluded: adding them surfaces a pre-existing src-versus-dist EmojiFilter type-identity error that is unrelated to this change. Fixes #3365
Review remediation for PR #3368. The workload was barely rendering. `@jrichman/ink` 6.4.8 computes `maxFps = options.maxFps ?? 30` and throttles frame production, while reconciliation stays synchronous through updateContainerSync and flushSyncWork. A tight rerender loop therefore reconciles thousands of times and produces almost nothing. Measured directly on the pinned fork: default throttle : requested=3000 actuallyRendered=39 maxFps: 0 : requested=3000 actuallyRendered=3001 39 out of 3000. The mode was measuring reconciliation and layout rather than the text and output path it exists to guard. Passes maxFps: 0 to disable the throttle, and counts real frames through the supported onRender option, exposed as framesRendered(). Two tests added: one asserts one rendered frame per rerender plus the initial mount, one asserts the throttle is disabled explicitly, so a silent regression cannot put the mode back to measuring nothing. The suggested async restructuring is not taken. With the throttle off, rerender produces its frame synchronously, so awaiting would add machinery without changing behaviour; the frame count is the check that actually proves the work happened, and it is asserted. Re-verified end to end with real rendering. The pinned fork still plateaus: jscHeap +0.900%, external +0.080%, dirty WebKit Malloc 0.000%, overall within tolerance. This also means every figure measured earlier for #3345 ran under the throttle. The build-to-build comparison stays valid because all builds were throttled identically, and the plateau-versus-linear conclusion survives re-measurement, but the absolute numbers reflect roughly 1.3% of the requested frames. Refs #3365
Review remediation for PR #3368. `expect(source).toContain('maxFps: 0')` asserted an implementation detail. Disabling the throttle through a constant, a helper, or a renamed option would break it while behaviour stayed correct. It was also redundant. The behavioural test already covers the same property far more precisely, because the frame count collapses by roughly two orders of magnitude if throttling returns: default throttle : requested=3000 actuallyRendered=39 maxFps: 0 : requested=3000 actuallyRendered=3001 Removed the source assertion and moved its rationale into the doc comment of `produces one rendered frame per rerender`, which is the check that actually proves the throttle is off. The source assertions in `is wired through both the target and the runner` are kept deliberately. They guard a different failure mode, a mode present in one script but not the other, and there is no cheap behavioural proxy for that short of running the whole harness inside the test. Six tests, all passing. Full verification cycle green: format, lint, build, typecheck and the entire suite with zero failures. Refs #3365
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I built an independent implementation of #3365 before noticing this PR existed (my fault, detailed at the end). Two findings from that work apply to this PR regardless of which implementation ships, so I am putting them here rather than opening a competing PR. 1.
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…nger noise (#3365) Two fixes from an independent implementation of this issue, both backed by measurement against this branch's own code. 1. renderFrames counted frames and never checked them. The InkWorkload handle exposed framesRendered() and bytesWritten() and documented them as letting the caller "verify the workload did the work it asked for rather than assuming it". The caller then assumed it. That matters because Ink's onRender builds the frame and then returns early when is-in-ci sees CI or CONTINUOUS_INTEGRATION, skipping the log-update write path. Driving this branch's module unchanged at 200 frames: CI unset: framesRendered 201, bytesWritten 500332 CI=true: framesRendered 201, bytesWritten 6 A frame counter alone cannot see it. On any runner with CI set the mode would report a clean plateau over a run whose write path did nothing. renderFrames now throws unless every rerender produced a frame and the sink advanced. The module gains an import.meta.main entry point so a test can drive the workload in a child process with a chosen environment. Ink decides whether to write when it is imported, so a test in the parent process cannot cover both cases, and on a CI runner it cannot cover the writing one at all. 2. Dirty WebKit Malloc does not plateau under this workload. Six runs on the pinned fork at 3000 frames a turn over five turns, post-GC vmmap readings in MB, one row per run: 708, 380, 255, 230, 217 0% 824, 807, 330, 297, 275 0% 763, 708, 339, 302, 280 0% 752, 690, 650, 768, 589 +11.2% 623, 265, 784, 348, 310 +195.7% 781, 333, 625, 377, 464 +87.7% The series has no trend. It tracks when bmalloc last scavenged relative to the checkpoint. evaluatePostGcPlateau compares the maximum of the settled turns to the first of them, so 0.00% is what you get when the maximum lands on the second sample, which is what the three passing rows are. Half of these runs condemn a build that is not leaking. evaluateMultiMetricPlateau now takes the set of metrics that gate the verdict, defaulting to all three so reasoning is unchanged. Ink measures and reports all three and gates on JSC heap and external, which held between 0.02% and 0.09% across all six runs. Each metric result carries whether it gates, so the artifact keeps the full picture and the runner names only real failures. Nothing this issue set out to catch is lost: fork 7.1.0 takes the JSC heap from 94.8 MB to 878.2 MB and upstream 7.1.1 takes external from 36.75 MB to 90.57 MB, both inside the gated pair. Verified: bun test on the three issue-2852/3365 suites passes, and again with CI=true; tsc --project tsconfig.scripts.json clean; eslint clean; and bun scripts/issue-2852-memory-runner.ts DIR ink 5 exits 0 with jscHeap 0.91%, external 0.08%, webkitMallocDirty 0.00% reported but not gating.
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Folded both findings into this branch as What changed, all within the existing shape of this PR:
Verification on this branch after the change: One thing I did not change and want your call on: |
Measured on the pinned fork over five turns: 20 frames a turn leaves the post-GC JSC heap climbing 12.5% across the settled turns because the first turn has not finished filling Ink's caches, and the verdict reports that warm-up as a leak. 1500 settles the heap and external inside 0.1%. 3000 holds them between 0.02% and 0.09% across six runs. Trimming the constant for speed silently breaks the verdict, so the basis belongs next to it.
1 participant
Fixes #3365
The gap
The
issue-2852memory harness had three modes,text,mediaandreasoning. All three drivePendingResponseBuffer. None renders a frame.So the post-GC plateau verdicts added by #3114 could not observe a leak in the
Ink render path, which is the one thing that runs continuously in the default
configuration.
This bit me directly. While evaluating the upstream-ink migration (#3345), an
isolated styled-character-cache benchmark said fork 7.1.0 was ~69x better than
our pinned 6.4.8, and I recommended a version bump on that basis. Rendering the
real alternate-buffer shape reversed the result. No existing check would have
failed on the regression.
Measured, identical 18,000-frame workload
Post-GC JSC heap, MB:
Per-turn native, sampled at each post-GC checkpoint:
The pin plateaus. Fork 7.1.0 climbs about 210 MB of footprint per turn.
What this adds
scripts/issue-2852-memory-ink.tsmounts theAlternateBufferLayoutshape(terminal-sized,
overflow: hidden, no<Static>) and re-renders it withdistinct content per frame. Two deliberate choices:
inkpackage, not a stub, so whatever the repositoryresolves
inkto is what gets measured. A dependency swap changes the subjectof the measurement, which is the point of the guard.
state and hide exactly the accumulation this mode exists to detect.
Wiring through the target and runner, routed to
evaluateMultiMetricPlateaurather than the JSC-heap-only verdict. The candidates fail on JSC heap,
externaland dirty WebKit Malloc simultaneously, and a heap-only check wouldaccept a build whose native memory runs away.
Verification
End to end against the shipped pin,
bun scripts/issue-2852-memory-runner.ts DIR ink 5:Five tests in
scripts/tests/issue-3365-ink-memory-mode.test.ts. They feed theactual measured series from both builds into the verdict rather than
requiring a leaking package to be installed, so they are deterministic and run
in normal CI:
mode is not gated on heap alone.
wiring cannot ship.
I first tried validating by swapping
node_modules/inkto 7.1.0 and running forreal. That fails on a
signal-exitresolution artifact of the crude copy, not agenuine incompatibility, and it is not a check that could live in CI. Asserting
the verdict against recorded series is both more honest and reusable.
npm run format,lint,build,typecheckand the full suite all pass withzero failures.
Notes for review
tsconfig.scripts.jsongains the new module, the benchmark it imports, andthe test. The target and runner stay excluded: adding them surfaces a
pre-existing
srcversusdistEmojiFiltertype-identity error unrelatedto this change.
worst case for any text cache. That is deliberate for a regression gate, but
it means the absolute figures are not a production forecast. The
plateau-versus-linear distinction is the durable result.
IOAccelerator, which remains Attribute and bound native IOSurface/IOAccelerator memory growth for image-bearing sessions (#2852 follow-up) #2905.
Summary by CodeRabbit
New Features
Tests