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perf: coalesce durable event-log batch writes - #13010
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ChangesEvent log batch writes
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The batching change preserves the event log’s documented write-failure behavior, and no actionable merge-blocking risk remains. Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error, 1 warning)
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Full details: Docstring CoverageExplanation 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 23 functions across 5 files. (2 skipped: 2 unsupported.) Full details: Cmux Swift Package BoundariesExplanation The PR materially changes Resolution Extract the writer and its unit tests into a small macOS SwiftPM target, such as
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Inline comments:
In `@Sources/CmuxEventLogWriter.swift`:
- Line 160: Update append(_:) to maintain one segment-level Data buffer, append
each encoded record to it, and call writeData once when rotation is required and
once for the final buffer. Preserve existing rotation boundaries and abort
immediately on write errors for every flushed segment.
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Sources/CmuxEventLogWriter.swiftcmux.xcodeproj/project.pbxprojcmuxTests/CmuxEventLogWriteSpy.swiftcmuxTests/CmuxEventLogWriterTests.swift
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Mac fleet instructions for head JOB_JSON=$(~/.local/bin/cmux-ci submit --kind cmux --command 'CMUX_FLEET_BUILD_TAG=pr-13010-1116d9e1 /Users/Shared/cmux-build-fleet/recipes/cmux.sh https://github.com/manaflow-ai/cmux.git 1116d9e19d6b4be43f0494abef693cb5c84b6345' --artifact artifacts/cmux.app.zip --workspace https://github.com/manaflow-ai/cmux/pull/13010 --source-digest 1116d9e19d6b4be43f0494abef693cb5c84b6345 --cache-key cmux:pr-13010 --min-free-bytes 268435456000 --label cmux --label ram48)
JOB_ID=$(python3 -c 'import json,sys; print(json.load(sys.stdin)["id"])' <<<"$JOB_JSON")
~/.local/bin/cmux-ci wait "$JOB_ID" --receipt artifacts/fleet/$JOB_ID.json
~/.local/bin/cmux-ci publish-hq "$JOB_ID"Use an existing campaign job ID if one is already posted; do not submit a duplicate. A wait timeout leaves the remote job running. Published results will include an exact-head artifact link and timing/disk receipt. This recipe validates the macOS app only, not iOS or tests. Never use maclease or put credentials in a PR comment. |
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Fleet build and live verification completed for Open/download the exact dev build
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Sep 20, 2026
c23c041 Fix non-glass overlay hosting that disrupts Minimal Mode chrome (manaflow-ai#12929) 534cdd1 fix: honor structured status when classifying missing provider VMs (manaflow-ai#12634) c41528b perf: coalesce durable event-log batch writes (manaflow-ai#13010) 107b9d2 ci: isolate the trusted complexity check from candidate Bun config and run it on merge groups (manaflow-ai#13114) 58e9f22 Allow Cloud machines to be reordered within pinned sections (manaflow-ai#13090) # Conflicts: # .github/workflows/ci.yml # .github/workflows/merge-group-policy-checks.yml # .github/workflows/web-complexity-trusted.yml
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Summary
Closes #12984.
Coalesces each pending event-log batch into a contiguous
Databuffer, writing once per file segment and flushing before rotation. Preserves complete ordered JSONL records, the 16 MiB boundary, the serialized utility queue, producer scheduling, pending-line limits/drop diagnostics, and error logging.The first commit adds a write-spy regression checkpoint with the original per-line algorithm. The next commit implements batching; the final commit records benchmark evidence and maximum-capacity coverage.
Verified dev build
Open/download pr-13010-1116d9e1
Exact source:
1116d9e19d6b4be43f0494abef693cb5c84b6345. Fleet jobfc1d27348f83e1816aadb719succeeded oncmux15.localin 414.50 seconds, including upload and verified cleanup. The downloaded digest and app signature passed; the build is installed and running with an isolated fixture home.Submission/terminal/publication receipts and verification details.
Testing
ci-status.autoreview --mode branch --base origin/mainpassed on this unchanged HEAD, including merge-conflict and cmux/Aziz policy gates. Review-policy triage is recorded in the verification comment.Seven samples per benchmark workload after warm-up, using real kernel-buffered writes to fresh isolated files. Every sample checks persisted bytes, parseable JSONL/order, rotation, off-main writes, and drop accounting.
Reproduction and raw benchmark data.
Trade-offs: one temporary buffer contains at most a log segment for ordinary records; an individual oversized record retains the existing write-whole/next-rotation cleanup policy. Failed I/O still aborts/logs without retry; a failed coalesced call can contain more records. Timing excludes fsync and does not establish a new power-loss guarantee or resolve the incident's whole-app CPU/memory use. No iOS verification is claimed.
The write spy's lock protects synchronous observations across the existing queue. Production concurrency ownership is unchanged. Localization audit: no new user-facing strings or shortcuts.
Demo evidence and limitations
The actual dev app was visually checked through native computer use; no video was recorded because local screen-recording access was unavailable. A post-quit computer-use observation briefly auto-reopened the tag without the isolated home; it was closed and relaunched explicitly into isolation. That brief launch may have appended startup records to the default log, which was left intact. No stable-app UI actions were taken.
The earlier standalone focused hosted runs used shortened SHAs and failed checkout before testing; corrected full-SHA supplemental jobs are separate from the already-passing app-host suite. The baseline red proof is the recorded deterministic local failure, not those checkout errors.
Checklist
Do not merge. Reuse the verified artifact for dogfood; approval and merge belong to Austin.