Switch trace event chunks from event count to size based#56080
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Switch trace event chunks from event count to size based#56080huntie wants to merge 2 commits intofacebook:mainfrom
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Summary: Update Android frame screenshot processing to skip screenshot capture when encoding is already in progress — now limited to a single background thread — while always emitting frame timing events. **Motivation** 1. Prevents truncated trace data on slower devices (e.g. missing screenshots for the last 1/3 of the trace), with the tradeoff of some intermediate frame screenshot loss. 2. Reduces total recording overhead by freeing up device threads - prevents excessive encoding work from blocking or slowing down the UI and other app threads. **Algorithm** Uses `encodingInProgress` atomic flag with single encoding thread and `lastFrameBuffer` storage for tail-capture of the last frame before idling (to capture settled animation states): - **Not encoding:** Frame passes directly to encoder → emits with screenshot when done - **Encoding busy:** Frame stored in `lastFrameBuffer` for tail-capture → any replaced frame emits without screenshot - **Encoding done:** Clears flag early, then opportunistically encodes tail frame without blocking new frames - **Failed captures:** Emit without screenshot immediately Result: Every frame emitted exactly once. Encoding adapts to device speed. Settled animation state guaranteed captured. **Remaining work** -⚠️ This still does not yet solve crashes (OkHttp network chunk size overflow) for heavy frame data at a high FPS on fast devices (coming next). Changelog: [Internal] Reviewed By: rubennorte Differential Revision: D95987488
Summary: Trace event chunks were previously split by a fixed event count (1000). This caused issues with Frame Timing events containing screenshot data, where a single chunk could produce CDP messages of tens or hundreds of MBs — exceeding the OkHttp WebSocket limit (app crash). Address this problem by replacing count-based chunking with size-based chunking (max 10 MiB per chunk) for `emitFrameTimings()` and `emitPerformanceTraceEvents()`. A new `TraceEventSerializer::estimateJsonSize()` utility recursively estimates the serialized byte size of a `folly::dynamic` value to avoid double-serialization overhead. **Notes** - RuntimeSamplingProfile chunks (separate code path) remain count-based (inherently small, no screenshot data). Changelog: [Internal] Reviewed By: rubennorte Differential Revision: D96206962
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) Summary: Pull Request resolved: facebook#56080 Trace event chunks were previously split by a fixed event count (1000). This caused issues with Frame Timing events containing screenshot data, where a single chunk could produce CDP messages of tens or hundreds of MBs — exceeding the OkHttp WebSocket limit (app crash). Address this problem by replacing count-based chunking with size-based chunking (max 10 MiB per chunk) for `emitFrameTimings()` and `emitPerformanceTraceEvents()`. A new `TraceEventSerializer::estimateJsonSize()` utility recursively estimates the serialized byte size of a `folly::dynamic` value to avoid double-serialization overhead. **Notes** - RuntimeSamplingProfile chunks (separate code path) remain count-based (inherently small, no screenshot data). Changelog: [Internal] Reviewed By: rubennorte Differential Revision: D96206962 fbshipit-source-id: 6b6e4db76441f174c46bf34905292585d0e30899
huntie
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Apr 8, 2026
Backports some CDP Performance features and stability improvements to `0.83-stable`. This includes: - Remaining implementation of Frame Timings and screenshot capture in performance traces (Android) - New support for Frame Timings and screenshot capture on iOS - Optimisations to trace chunk generation, memory usage during performance recording - `Page.captureScreenshot` (Android, iOS) All features remain gated behind feature flags (`fuseboxFrameRecordingEnabled`, `fuseboxScreenshotCaptureEnabled`). **Commits applied** - Define TracingCategory enum (facebook#54377) bd6c6bf - Use TracingCategory in TraceEvent (facebook#54378) ce60f27 - Simple parser for serialized tracing categories (facebook#54379) 62275b6 - Propagate tracing categories to recording state (facebook#54380) 3841ef0 - Re-land "Revert D85999774: [rn][android] Add FrameTiming module" (facebook#54502) 85905ad - Add screenshot category (facebook#54537) 5d9cb80 - Define HostTargetTracingDelegate (facebook#54622) be0dae0 - Define TracingDelegate for Android Host (facebook#54628) a212e95 - Use new API for tracing state on Android (facebook#54629) 532d0be - Internalize TracingState interface (facebook#54631) 58ec261 - Move TracingState interfaces to inspector package (facebook#54632) 10d0d99 - Rename values of TracingState enum (facebook#54630) be94707 - FrameTiming module to subscribe to Inspector tracing lifecycle (facebook#54633) 04ee02b - Clarify HostTracingProfile and HostTraceRecordingState (facebook#54677) ec92f12 - Introduce TimeWindowedBuffer (facebook#54679) d6ee54f - Keep tracing time window on TraceRecordingState (facebook#54673) e651563 - Define FrameTimingSequence (facebook#54674) 5b7d92f - Define an endpoint on HostTarget to capture frame timings (facebook#54672) f469aa3 - Extract frame trace events construction logic (facebook#54675) 57973fa - Define serializers for frame timings as part of HostTargetTracingProfile (facebook#54681) 587d360 - Propagate Frames data through Host (facebook#54671) 26ff069 - Cleanup no longer used jni layer for frame timings (facebook#54678) 9ba4ce6 - Fix screenshot typo (facebook#54742) 52186a3 - Add optional screenshot argument to FrameTimingSequence (facebook#54743) 57c29fc - Frame screenshot event generation (facebook#54744) b447d26 - Frame screenshots capture implementation (facebook#54745) f3c9a8d - BeginDrawing: INTENDED_VSYNC_TIMESTAMP -> VSYNC_TIMESTAMP (facebook#54765) 9221772 - Add frames category (facebook#54768) 31a0c9a - Specify correct category for SetLayerTreeId event (facebook#54769) cd055e9 - Reduce the screenshots size (facebook#54800) e4a5a56 - Remove Commit from FrameTimingSequence (facebook#54779) 39f7703 - Fix potential bitmap leaks in FrameTimingsObserver (facebook#55652) 3918dd1 - Capture initial screenshot when starting frame timing trace (facebook#55720) 863f5c0 - Refactor FrameTimingsObserver for multi-activity support (facebook#55740) 8230f3b - Reorder FrameTimingsObserver methods (facebook#55743) f56b295 - Increase frame capture quality, apply scaling after DPI normalization (facebook#55731) e5f9f5f - Fix FrameTimingsObverver to initiate PixelCopy on main thread (facebook#55744) d552f2a - Fix bitmap reuse race condition in FrameTimingsObserver (facebook#55745) 3924768 - Fix trailing frame capture after recording ended (facebook#55704) 47684ca - Move base64Encode into react/utils (facebook#55873) 422770d - Move screenshot Base64 encoding to trace serialization (facebook#55803) dc4c36e - Restore inspector addPage listener callback (facebook#55925) 8c763fc - Add tracing helper functions for RNDT traces in C++ and Kotlin (facebook#55935) 4f3f536 - Introduce fuseboxFrameRecordingEnabled flag, gate existing code (facebook#55941) 1aa7a32 - Implement Performance frames and screenshots on iOS (facebook#56015) 64a1a10 - Add pixel diffing to RCTFrameTimingsObserver (facebook#56043) 9d231af - Add dynamic sampling to frame screenshots (facebook#56048) d309cda - Switch trace event chunks from event count to size based (facebook#56080) d3b33f5 - Increase trace screenshot scale factor to 1x (facebook#56079) 972a30d - Add Page.captureScreenshot CDP support (facebook#56307) 77332d2 - Fix data race on PerformanceObserver entry buffer (facebook#56352) 5eb1ca1 - [LOCAL] Remove stale frame event code from PerformanceTracer - [LOCAL] Update Podfile.lock
huntie
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Apr 8, 2026
Backports some CDP Performance features and stability improvements to `0.83-stable`. This includes: - Remaining implementation of Frame Timings and screenshot capture in performance traces (Android) - New support for Frame Timings and screenshot capture on iOS - Optimisations to trace chunk generation, memory usage during performance recording - `Page.captureScreenshot` (Android, iOS) All features remain gated behind feature flags (`fuseboxFrameRecordingEnabled`, `fuseboxScreenshotCaptureEnabled`). **Commits applied** - Define TracingCategory enum (facebook#54377) bd6c6bf - Use TracingCategory in TraceEvent (facebook#54378) ce60f27 - Simple parser for serialized tracing categories (facebook#54379) 62275b6 - Propagate tracing categories to recording state (facebook#54380) 3841ef0 - Re-land "Revert D85999774: [rn][android] Add FrameTiming module" (facebook#54502) 85905ad - Add screenshot category (facebook#54537) 5d9cb80 - Define HostTargetTracingDelegate (facebook#54622) be0dae0 - Define TracingDelegate for Android Host (facebook#54628) a212e95 - Use new API for tracing state on Android (facebook#54629) 532d0be - Internalize TracingState interface (facebook#54631) 58ec261 - Move TracingState interfaces to inspector package (facebook#54632) 10d0d99 - Rename values of TracingState enum (facebook#54630) be94707 - FrameTiming module to subscribe to Inspector tracing lifecycle (facebook#54633) 04ee02b - Clarify HostTracingProfile and HostTraceRecordingState (facebook#54677) ec92f12 - Introduce TimeWindowedBuffer (facebook#54679) d6ee54f - Keep tracing time window on TraceRecordingState (facebook#54673) e651563 - Define FrameTimingSequence (facebook#54674) 5b7d92f - Define an endpoint on HostTarget to capture frame timings (facebook#54672) f469aa3 - Extract frame trace events construction logic (facebook#54675) 57973fa - Define serializers for frame timings as part of HostTargetTracingProfile (facebook#54681) 587d360 - Propagate Frames data through Host (facebook#54671) 26ff069 - Cleanup no longer used jni layer for frame timings (facebook#54678) 9ba4ce6 - Fix screenshot typo (facebook#54742) 52186a3 - Add optional screenshot argument to FrameTimingSequence (facebook#54743) 57c29fc - Frame screenshot event generation (facebook#54744) b447d26 - Frame screenshots capture implementation (facebook#54745) f3c9a8d - BeginDrawing: INTENDED_VSYNC_TIMESTAMP -> VSYNC_TIMESTAMP (facebook#54765) 9221772 - Add frames category (facebook#54768) 31a0c9a - Specify correct category for SetLayerTreeId event (facebook#54769) cd055e9 - Reduce the screenshots size (facebook#54800) e4a5a56 - Remove Commit from FrameTimingSequence (facebook#54779) 39f7703 - Fix potential bitmap leaks in FrameTimingsObserver (facebook#55652) 3918dd1 - Capture initial screenshot when starting frame timing trace (facebook#55720) 863f5c0 - Refactor FrameTimingsObserver for multi-activity support (facebook#55740) 8230f3b - Reorder FrameTimingsObserver methods (facebook#55743) f56b295 - Increase frame capture quality, apply scaling after DPI normalization (facebook#55731) e5f9f5f - Fix FrameTimingsObverver to initiate PixelCopy on main thread (facebook#55744) d552f2a - Fix bitmap reuse race condition in FrameTimingsObserver (facebook#55745) 3924768 - Fix trailing frame capture after recording ended (facebook#55704) 47684ca - Move base64Encode into react/utils (facebook#55873) 422770d - Move screenshot Base64 encoding to trace serialization (facebook#55803) dc4c36e - Restore inspector addPage listener callback (facebook#55925) 8c763fc - Add tracing helper functions for RNDT traces in C++ and Kotlin (facebook#55935) 4f3f536 - Introduce fuseboxFrameRecordingEnabled flag, gate existing code (facebook#55941) 1aa7a32 - Implement Performance frames and screenshots on iOS (facebook#56015) 64a1a10 - Add pixel diffing to RCTFrameTimingsObserver (facebook#56043) 9d231af - Add dynamic sampling to frame screenshots (facebook#56048) d309cda - Switch trace event chunks from event count to size based (facebook#56080) d3b33f5 - Increase trace screenshot scale factor to 1x (facebook#56079) 972a30d - Add Page.captureScreenshot CDP support (facebook#56307) 77332d2 - Fix data race on PerformanceObserver entry buffer (facebook#56352) 5eb1ca1 - [LOCAL] Remove stale frame event code from PerformanceTracer - [LOCAL] Update Podfile.lock
huntie
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Apr 9, 2026
Backports some CDP Performance features and stability improvements to `0.83-stable`. This includes: - Remaining implementation of Frame Timings and screenshot capture in performance traces (Android) - New support for Frame Timings and screenshot capture on iOS - Optimisations to trace chunk generation, memory usage during performance recording - `Page.captureScreenshot` (Android, iOS) All features remain gated behind feature flags (`fuseboxFrameRecordingEnabled`, `fuseboxScreenshotCaptureEnabled`). **Commits applied** - Define TracingCategory enum (facebook#54377) bd6c6bf - Use TracingCategory in TraceEvent (facebook#54378) ce60f27 - Simple parser for serialized tracing categories (facebook#54379) 62275b6 - Propagate tracing categories to recording state (facebook#54380) 3841ef0 - Re-land "Revert D85999774: [rn][android] Add FrameTiming module" (facebook#54502) 85905ad - Add screenshot category (facebook#54537) 5d9cb80 - Define HostTargetTracingDelegate (facebook#54622) be0dae0 - Define TracingDelegate for Android Host (facebook#54628) a212e95 - Use new API for tracing state on Android (facebook#54629) 532d0be - Internalize TracingState interface (facebook#54631) 58ec261 - Move TracingState interfaces to inspector package (facebook#54632) 10d0d99 - Rename values of TracingState enum (facebook#54630) be94707 - FrameTiming module to subscribe to Inspector tracing lifecycle (facebook#54633) 04ee02b - Clarify HostTracingProfile and HostTraceRecordingState (facebook#54677) ec92f12 - Introduce TimeWindowedBuffer (facebook#54679) d6ee54f - Keep tracing time window on TraceRecordingState (facebook#54673) e651563 - Define FrameTimingSequence (facebook#54674) 5b7d92f - Define an endpoint on HostTarget to capture frame timings (facebook#54672) f469aa3 - Extract frame trace events construction logic (facebook#54675) 57973fa - Define serializers for frame timings as part of HostTargetTracingProfile (facebook#54681) 587d360 - Propagate Frames data through Host (facebook#54671) 26ff069 - Cleanup no longer used jni layer for frame timings (facebook#54678) 9ba4ce6 - Fix screenshot typo (facebook#54742) 52186a3 - Add optional screenshot argument to FrameTimingSequence (facebook#54743) 57c29fc - Frame screenshot event generation (facebook#54744) b447d26 - Frame screenshots capture implementation (facebook#54745) f3c9a8d - BeginDrawing: INTENDED_VSYNC_TIMESTAMP -> VSYNC_TIMESTAMP (facebook#54765) 9221772 - Add frames category (facebook#54768) 31a0c9a - Specify correct category for SetLayerTreeId event (facebook#54769) cd055e9 - Reduce the screenshots size (facebook#54800) e4a5a56 - Remove Commit from FrameTimingSequence (facebook#54779) 39f7703 - Fix potential bitmap leaks in FrameTimingsObserver (facebook#55652) 3918dd1 - Capture initial screenshot when starting frame timing trace (facebook#55720) 863f5c0 - Refactor FrameTimingsObserver for multi-activity support (facebook#55740) 8230f3b - Reorder FrameTimingsObserver methods (facebook#55743) f56b295 - Increase frame capture quality, apply scaling after DPI normalization (facebook#55731) e5f9f5f - Fix FrameTimingsObverver to initiate PixelCopy on main thread (facebook#55744) d552f2a - Fix bitmap reuse race condition in FrameTimingsObserver (facebook#55745) 3924768 - Fix trailing frame capture after recording ended (facebook#55704) 47684ca - Move base64Encode into react/utils (facebook#55873) 422770d - Move screenshot Base64 encoding to trace serialization (facebook#55803) dc4c36e - Restore inspector addPage listener callback (facebook#55925) 8c763fc - Add tracing helper functions for RNDT traces in C++ and Kotlin (facebook#55935) 4f3f536 - Introduce fuseboxFrameRecordingEnabled flag, gate existing code (facebook#55941) 1aa7a32 - Implement Performance frames and screenshots on iOS (facebook#56015) 64a1a10 - Add pixel diffing to RCTFrameTimingsObserver (facebook#56043) 9d231af - Add dynamic sampling to frame screenshots (facebook#56048) d309cda - Switch trace event chunks from event count to size based (facebook#56080) d3b33f5 - Increase trace screenshot scale factor to 1x (facebook#56079) 972a30d - Add Page.captureScreenshot CDP support (facebook#56307) 77332d2 - Fix data race on PerformanceObserver entry buffer (facebook#56352) 5eb1ca1 - Add dynamic sampling to frame screenshots (facebook#56135) e0d1e29 - Increase trace screenshot scale factor to 1x (facebook#56136) 90e02fa - Add missing debugger define for React-RuntimeApple (facebook#56397) - [LOCAL] Remove stale frame event code from PerformanceTracer - [LOCAL] Update Podfile.lock
gabrieldonadel
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Apr 13, 2026
Backports some CDP Performance features and stability improvements to `0.83-stable`. This includes: - Remaining implementation of Frame Timings and screenshot capture in performance traces (Android) - New support for Frame Timings and screenshot capture on iOS - Optimisations to trace chunk generation, memory usage during performance recording - `Page.captureScreenshot` (Android, iOS) All features remain gated behind feature flags (`fuseboxFrameRecordingEnabled`, `fuseboxScreenshotCaptureEnabled`). **Commits applied** - Define TracingCategory enum (#54377) bd6c6bf - Use TracingCategory in TraceEvent (#54378) ce60f27 - Simple parser for serialized tracing categories (#54379) 62275b6 - Propagate tracing categories to recording state (#54380) 3841ef0 - Re-land "Revert D85999774: [rn][android] Add FrameTiming module" (#54502) 85905ad - Add screenshot category (#54537) 5d9cb80 - Define HostTargetTracingDelegate (#54622) be0dae0 - Define TracingDelegate for Android Host (#54628) a212e95 - Use new API for tracing state on Android (#54629) 532d0be - Internalize TracingState interface (#54631) 58ec261 - Move TracingState interfaces to inspector package (#54632) 10d0d99 - Rename values of TracingState enum (#54630) be94707 - FrameTiming module to subscribe to Inspector tracing lifecycle (#54633) 04ee02b - Clarify HostTracingProfile and HostTraceRecordingState (#54677) ec92f12 - Introduce TimeWindowedBuffer (#54679) d6ee54f - Keep tracing time window on TraceRecordingState (#54673) e651563 - Define FrameTimingSequence (#54674) 5b7d92f - Define an endpoint on HostTarget to capture frame timings (#54672) f469aa3 - Extract frame trace events construction logic (#54675) 57973fa - Define serializers for frame timings as part of HostTargetTracingProfile (#54681) 587d360 - Propagate Frames data through Host (#54671) 26ff069 - Cleanup no longer used jni layer for frame timings (#54678) 9ba4ce6 - Fix screenshot typo (#54742) 52186a3 - Add optional screenshot argument to FrameTimingSequence (#54743) 57c29fc - Frame screenshot event generation (#54744) b447d26 - Frame screenshots capture implementation (#54745) f3c9a8d - BeginDrawing: INTENDED_VSYNC_TIMESTAMP -> VSYNC_TIMESTAMP (#54765) 9221772 - Add frames category (#54768) 31a0c9a - Specify correct category for SetLayerTreeId event (#54769) cd055e9 - Reduce the screenshots size (#54800) e4a5a56 - Remove Commit from FrameTimingSequence (#54779) 39f7703 - Fix potential bitmap leaks in FrameTimingsObserver (#55652) 3918dd1 - Capture initial screenshot when starting frame timing trace (#55720) 863f5c0 - Refactor FrameTimingsObserver for multi-activity support (#55740) 8230f3b - Reorder FrameTimingsObserver methods (#55743) f56b295 - Increase frame capture quality, apply scaling after DPI normalization (#55731) e5f9f5f - Fix FrameTimingsObverver to initiate PixelCopy on main thread (#55744) d552f2a - Fix bitmap reuse race condition in FrameTimingsObserver (#55745) 3924768 - Fix trailing frame capture after recording ended (#55704) 47684ca - Move base64Encode into react/utils (#55873) 422770d - Move screenshot Base64 encoding to trace serialization (#55803) dc4c36e - Restore inspector addPage listener callback (#55925) 8c763fc - Add tracing helper functions for RNDT traces in C++ and Kotlin (#55935) 4f3f536 - Introduce fuseboxFrameRecordingEnabled flag, gate existing code (#55941) 1aa7a32 - Implement Performance frames and screenshots on iOS (#56015) 64a1a10 - Add pixel diffing to RCTFrameTimingsObserver (#56043) 9d231af - Add dynamic sampling to frame screenshots (#56048) d309cda - Switch trace event chunks from event count to size based (#56080) d3b33f5 - Increase trace screenshot scale factor to 1x (#56079) 972a30d - Add Page.captureScreenshot CDP support (#56307) 77332d2 - Fix data race on PerformanceObserver entry buffer (#56352) 5eb1ca1 - Add dynamic sampling to frame screenshots (#56135) e0d1e29 - Increase trace screenshot scale factor to 1x (#56136) 90e02fa - Add missing debugger define for React-RuntimeApple (#56397) - [LOCAL] Remove stale frame event code from PerformanceTracer - [LOCAL] Update Podfile.lock
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Summary:
Trace event chunks were previously split by a fixed event count (1000). This caused issues with Frame Timing events containing screenshot data, where a single chunk could produce CDP messages of tens or hundreds of MBs — exceeding the OkHttp WebSocket limit (app crash).
Address this problem by replacing count-based chunking with size-based chunking (max 10 MiB per chunk) for
emitFrameTimings()andemitPerformanceTraceEvents(). A newTraceEventSerializer::estimateJsonSize()utility recursively estimates the serialized byte size of afolly::dynamicvalue to avoid double-serialization overhead.Notes
Changelog: [Internal]
Reviewed By: rubennorte
Differential Revision: D96206962