feat(example): add a frame-time benchmark harness - #66
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WalkthroughThe change adds a cross-platform benchmark application, native frame statistics, deterministic map scenarios, threshold evaluation, reporting tools, automated flows, benchmark documentation, and map-pipeline tracing for Android and iOS. ChangesBenchmark harness
Map pipeline tracing
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature · Unblocks: 4 PRs Sequence Diagram(s)sequenceDiagram
participant BenchmarkApp
participant runScenario
participant FrameStats
participant evaluateFrameStats
participant benchmarkTable
BenchmarkApp->>runScenario: run selected scenario
runScenario->>FrameStats: record frames, memory, and display rate
runScenario->>evaluateFrameStats: evaluate metrics
evaluateFrameStats-->>runScenario: return pass or failure details
runScenario->>benchmarkTable: publish serialized result
runScenario-->>BenchmarkApp: return ScenarioResult
Possibly related PRs
Merge Risk: ⚪ Minimal · up to The reviewed changes do not show a concrete merge-blocking behavior regression. 🚥 Pre-merge checks | ✅ 5 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (5 passed)
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React Doctor found 6 issues in 3 files · 2 errors & 4 warnings · score 64 / 100 (Needs work) · full project Errors
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This was referenced Sep 8, 2026
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Inline comments:
In `@docs/benchmarks.md`:
- Line 124: Rename the memory column header from “RSS Δ” to match the measured
metric: use “phys_footprint Δ” for the iOS table at docs/benchmarks.md lines
124-124 and “PSS Δ” for the Android table at lines 152-152.
- Line 84: Update the benchmark log-streaming documentation around the xcrun
simctl command to explicitly label it as simulator-only. State that
physical-device runs should use the documented Share JSON export or a supported
device-log tool instead.
In `@example/benchmark/BenchmarkApp.tsx`:
- Around line 99-103: Update the readiness timeout flow in BenchmarkApp so the
timeout callback clears readyResolver.current before resolving. Preserve the
existing clearTimeout behavior in the readyResolver callback and ensure a late
onMapReady cannot resolve a subsequent mount after a timeout.
- Around line 183-204: Update toggleManualRecording to normalize the refresh
rate from displayRefreshRateHz() to a strictly positive value before
computeFrameStats, falling back to 60 when it is zero or invalid. Wrap
stopFrameRecording and result publication in try/catch/finally so failures set a
failure status and do not escape; always stop active.lag and reset manual
recording state in finally.
In `@example/benchmark/scenarios.ts`:
- Around line 62-63: Update the camera animation flow around
ScenarioContext.map() to throw an error when no map reference is returned,
rather than silently skipping animateCamera and continuing to sleep. Preserve
the existing durationMs / 1000 conversion and sleep timing when a map is
available.
In `@example/index.js`:
- Around line 4-9: Update the comment above the conditional App selection to
accurately state that EXPO_PUBLIC_BENCHMARK chooses the rendered screen at
bundle time but both static require() dependencies remain in Metro’s dependency
graph; do not claim the benchmark harness is excluded.
In `@example/scripts/benchmark-table.mjs`:
- Around line 33-36: Validate platform, provider, refreshRateHz, and recordedAt
for every result while collecting results, comparing each against the first
result; exit with an error on any mismatch before generating the report. Keep
the existing first-result header only for validated homogeneous benchmark
metadata.
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📒 Files selected for processing (36)
docs/benchmarks.mdeslint.config.mjsexample/app.jsonexample/benchmark/BenchmarkApp.tsxexample/benchmark/__tests__/frameStats.test.tsexample/benchmark/__tests__/thresholds.test.tsexample/benchmark/datasets.tsexample/benchmark/frameStats.tsexample/benchmark/jsLagSampler.tsexample/benchmark/runner.tsexample/benchmark/scenarios.tsexample/benchmark/thresholds.tsexample/examples/advancedFeatures.tsexample/index.jsexample/maestro/benchmark-pan.yamlexample/maestro/benchmark-run-all.yamlexample/modules/frame-stats/android/build.gradleexample/modules/frame-stats/android/src/main/AndroidManifest.xmlexample/modules/frame-stats/android/src/main/java/expo/modules/framestats/FrameRecorder.ktexample/modules/frame-stats/android/src/main/java/expo/modules/framestats/FrameStatsModule.ktexample/modules/frame-stats/expo-module.config.jsonexample/modules/frame-stats/index.tsexample/modules/frame-stats/ios/FrameRecorder.swiftexample/modules/frame-stats/ios/FrameStats.podspecexample/modules/frame-stats/ios/FrameStatsModule.swiftexample/modules/frame-stats/package.jsonexample/modules/frame-stats/src/FrameStats.tsexample/scripts/benchmark-table.mjsexample/tsconfig.jsonpackage/android/build.gradlepackage/android/src/main/java/com/margelo/nitro/nitromaps/MapOverlayController.ktpackage/android/src/main/java/com/margelo/nitro/nitromaps/MapTrace.ktpackage/ios/GoogleMapOverlayController.swiftpackage/ios/MapOverlayController.swiftpackage/ios/MapTrace.swiftpackage/ios/MarkerClusterEngine.swift
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Measures main-thread frame intervals, JS-thread stalls and memory while the map is driven through fixed scenarios, so the marker pipeline can be judged on numbers instead of estimates. - example/modules/frame-stats: a local Expo module. CADisplayLink on iOS and Choreographer.FrameCallback on Android record every main-thread frame interval together with the interval the display was running at, so jank is judged against the display's own budget and ProMotion rate changes do not count as jank. Also exposes phys_footprint / PSS, the display refresh rate, and a system-log writer so release builds can be harvested without Metro. - example/benchmark: nearest-rank percentiles, jank and dropped-frame counts, pass/fail rules scaled to the frame budget (unit tested), a JS-thread lag sampler, scenarios A to L driven by animated camera moves and prop updates, a runner, and a BenchmarkApp screen with Run all, per-scenario runs, a manual recorder for real gestures and JSON export. - example/index.js picks the harness when EXPO_PUBLIC_BENCHMARK=1; the demo bundle is unchanged otherwise. app.json sets CADisableMinimumFrameDurationOnPhone so a ProMotion iPhone is measured at 120 Hz. - Maestro flows for the scripted run and a real-gesture pan, a script that turns captured [benchmark] lines into a Markdown table, and docs/benchmarks.md with the method, thresholds, scenarios, how to run and collect, and two labeled smoke runs (iPhone 17 Pro simulator, Android API 35 emulator).
os_signpost intervals on iOS (subsystem com.nitromaps, category MarkerPipeline) and android.os.Trace sections on Android (prefix NitroMaps.) around the marker fingerprint, the spatial index build, the viewport compute and the diff apply, so Instruments and Perfetto show where the pipeline spends its time. No-ops without a tracer attached.
Release builds failed with "Type com.facebook.fbreact.specs.NativeAccessibilityInfoSpec is defined multiple times". The library applies com.facebook.react, whose codegen root defaults to the package directory; with an isolated installer (bun, pnpm) that directory contains node_modules/react-native, so the plugin generated React Native's own core specs into this library and they collided with react-android when the release dex was merged. Debug builds hide it because project and library dex files are merged separately. Point jsRootDir at src, which holds no React Native codegen specs; nitrogen generates this library's bindings.
The last result row can sit below the fold of the results list, so waiting for it times out; the summary line shows "<passed>/11 passed" once every scenario has a result.
Clarify docs and entrypoint comments, tighten mount/manual/camera error handling, and reject mixed metadata when building benchmark tables.
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What
A benchmark harness for the example app. It measures main-thread frame intervals, JS-thread stalls and memory while the map is driven through fixed scenarios, so the marker pipeline can be judged on numbers instead of estimates. Nothing here ships in the library except the profiling markers; the harness lives in the example app and a local Expo module.
example/modules/frame-stats— a local Expo module.CADisplayLinkon iOS andChoreographer.FrameCallbackon Android record every main-thread frame interval together with the interval the display was running at, so jank is judged against 8.33 ms on a 120 Hz display and 16.67 ms on a 60 Hz one, and ProMotion rate changes do not count as jank. Also exposesphys_footprint/ PSS for memory deltas, the display refresh rate, and a system-log line writer so release builds can be harvested without Metro.example/benchmark— pure stats math (nearest-rank percentiles, jank, dropped frames) and pass/fail rules scaled to the display's frame budget with a 5 % allowance for display-link jitter, both unit-tested (cd example && bun test, 15 tests); a JS-thread lag sampler; scenarios A–L driven by animated camera moves and prop updates; a runner that mounts, settles, records, scripts and evaluates each scenario; andBenchmarkApp, a screen with "Run all", per-scenario runs, a manual recorder for real gestures, an on-screen table and JSON export.example/index.jspicks the harness whenEXPO_PUBLIC_BENCHMARK=1; the demo bundle is unchanged otherwise.example/app.jsonsetsCADisableMinimumFrameDurationOnPhoneso a ProMotion iPhone is measured at 120 Hz.example/maestro/— two flows: the full scripted run, and a real-gesture pan on the 10k scenario through the manual recorder.example/scripts/benchmark-table.mjs— turns captured[benchmark]lines into the Markdown table used in the docs.docs/benchmarks.md— what is measured, thresholds, scenarios, how to run and collect, limitations, and two labeled smoke runs.os_signpostintervals (iOS) andandroid.os.Tracesections (Android) around the marker fingerprint, spatial index build, viewport compute and diff apply, for Instruments and Perfetto. No-ops without a tracer.Limitations, stated up front
animateCamera. On MapKit and Android that runs the same native camera path as a gesture; on the iOS Google provider the live marker refresh during movement is gesture-only, so use the manual recorder or the Maestro flow there.Testing
bun run lint, package typecheck and tests (156 pass), example typecheck (tsc -p example/tsconfig.json) and example tests (15 pass, the stats math and thresholds): clean.expo run:ios --configuration ReleasewithEXPO_PUBLIC_BENCHMARK=1on the iPhone 17 Pro simulator. The local module autolinked (Installing FrameStats (0.1.0)), the release bundle carried the flag, and "Run all" produced 11 results. Table indocs/benchmarks.md, labeled as a harness smoke run: 7 pass, 4 fail, and the failures are the expected ones (p99 at two frames on the clustered zoom sweep and on rotation, worst frame 80 ms during rotation).example/maestro/benchmark-run-all.yaml; 11 results, table in the docs with the dev-mode caveat. It shows the marker add/remove churn far more starkly than the simulator: 850 ms worst frame on the 10k pan, 717 ms on the clustered zoom sweep, JS lag p95 of 180 ms while clustering. A physical 60 Hz phone is connected, but Google Play Protect blocks adb installs until the prompt is accepted on the device, so there are no phone numbers yet.:app:assembleReleasefails on the base branch withType com.facebook.fbreact.specs.NativeAccessibilityInfoSpec is defined multiple times. The library appliescom.facebook.react, whose codegen root defaults to the package directory, and with bun's isolated install that directory containsnode_modules/react-native, so the plugin generated React Native's own core specs into the library (debug builds hide it because project and library dex files are merged separately). A separate commit pointsjsRootDiratsrc; after it the library's release jars contain zerofbreact/specsclasses and the build passes.Need help on this PR? Tag
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