Pin the autoreleasepool that keeps -z from exhausting memory - #489
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183be4d (#372) wrapped per-attachment image work in an autoreleasepool, which is what stopped `-z` from being killed on a large report (#337). Nothing held that line down: deleting it left every test green while peak memory went back to scaling with attachment count. Downsizing decodes each screenshot into an NSImage, renders it at the new size, takes a TIFF representation of that, and encodes JPEG from it. Those are autoreleased Cocoa objects, so without a pool draining them per attachment they survive to the end of the process. Measured through this test, that is ~25-27 MB retained per screenshot: the reporter's 2,532 screenshots extrapolate to ~70 GB, which is the ">100 GBs of RAM" and status 137 they described, and it explains why the same flag worked on a small sample. The test asserts a shape rather than a number -- memory must not scale with attachment count -- because that is the property that actually failed. The margin is wide enough that resident-size noise cannot reach it: ~0.06 MB per attachment with the pool against ~25 MB without, and a 5 MB budget between them. Verified in both directions: it passes on main, and with the pool bypassed it fails at 27 MB per attachment naming the pool as the thing to check. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Included review availability: Your plan includes up to 3 reviews per rolling hour; 1 remains after this review. 📝 WalkthroughWalkthroughAdds ChangesDownsize memory scaling test
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change adds a focused regression test without altering production behavior, and no actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@Tests/XCTestHTMLReportTests/DownsizeMemoryTests.swift`:
- Around line 42-53: Update residentBytes() to throw when task_info returns a
result other than KERN_SUCCESS instead of returning 0, and update both call
sites to use try residentBytes().
- Around line 105-119: Update the memory test around Activity initialization to
assert an observable downsizing result from a rendered attachment, such as its
image dimensions or transformed payload, before or alongside the
attachment-count assertion. Use the existing attachment data and
downsizeImagesEnabled/downsizeScaleFactor configuration so the test confirms the
autoreleasepool-protected image path actually applied downsizing.
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Tests/XCTestHTMLReportTests/DownsizeMemoryTests.swift
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Both from review on #489, and both are the failure mode a regression test can least afford: reporting success without having measured anything. `residentBytes` returned 0 when `task_info` failed, which would have made `after - before` zero and the budget trivially satisfied. It throws now. More seriously, the test asserted only the attachment count, so it never established that downsizing had actually happened. Had the flag stopped being honoured, or `AttachmentType.isImage` stopped recognising the extension, no image would have been decoded, memory would have stayed flat, and the test would have passed while the autoreleasepool it exists to protect went unexercised. It now asserts the rendered attachment really is the downsized image -- a quarter of the source width, and smaller on disk than the source. Verified against both regressions independently: with the pool removed it fails at 32 MB per attachment, and with downsizing turned into a no-op it fails on the rendered width (1290 against the expected 322.5) rather than passing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Adds a regression test for #337. No production code changes.
Why
183be4d(#372) wrapped per-attachment image work in anautoreleasepool, which is what stopped-zfrom being killed on a large report. Nothing held that line down — deleting it leaves the entire suite green while peak memory goes back to scaling with attachment count.Downsizing decodes each screenshot into an
NSImage, renders it at the new size, takes a TIFF representation of that, and encodes JPEG from the representation. Those are autoreleased Cocoa objects, so without a pool draining them per attachment they survive to the end of the process.There is exactly one
Attachment(construction site in the codebase (Activity.swift:73) and it is the pooled one, so the fix covers both the legacy and modern readers — worth confirming after the 4.0 reader migration.What it measures
The test asserts a shape, not a number: memory must not scale with attachment count. That is the property that actually failed.
Extrapolating the unpooled rate to the reporter's 2,532 screenshots gives ~70 GB, which matches the ">100 GBs of RAM" and status 137 they described, and explains why the same flag worked on a small sample.
The 5 MB/attachment budget sits two orders of magnitude above the passing case and a fifth of the failing one, so resident-size noise on a busy runner cannot reach it in either direction. Runtime is ~7s.
Verification
Verified in both directions — a guard that does not fail without the fix is worthless:
mainReuses the existing
StubPayloadProviderandSyntheticResult.activityrather than adding a second set of fakes.Note on local test runs
swift testcurrently shows 16 unrelated failures on this checkout.scripts/verify_fixtures.shreports the cause:TestResults.xcresultcontains 16 tests where at least 21 are expected, andCrashResults.xcresultis missing. Confirmed pre-existing with a control run —CoreTests.testResultStatusCountfails identically with this file removed. CI regenerates fixtures, so CI is the real check here.🤖 Generated with Claude Code
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