⚡ Bolt: Optimize ShareableMap/Array defragmentation#55
⚡ Bolt: Optimize ShareableMap/Array defragmentation#55
Conversation
- Replaces slow `DataView` byte-by-byte copying with a hybrid `Uint8Array` strategy. - Uses manual loops for small blocks (<64 bytes) to avoid TypedArray view creation overhead. - Uses `Uint8Array.prototype.set` with `subarray` for larger blocks to leverage native optimized copying. - Fixes a bug in `ShareableArray.defragment` where `DATA_OBJECT_OFFSET` was added twice to the data pointer, causing memory gaps. Performance impact: - Reduces `ShareableMap` defragmentation time by ~14% in tests. - Significantly faster copying for larger items. - Fixes incorrect memory usage in `ShareableArray`. Co-authored-by: pverscha <9608686+pverscha@users.noreply.github.com>
|
👋 Jules, reporting for duty! I'm here to lend a hand with this pull request. When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down. I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job! For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with New to Jules? Learn more at jules.google/docs. For security, I will only act on instructions from the user who triggered this task. |
1 participant
⚡ Bolt: Optimize defragmentation copying
💡 What:
Replaced the
DataView-based byte-by-byte copy loop indefragmentmethods with a hybrid approach usingUint8Array.subarraycreation overhead).Uint8Array.prototype.setwithsubarray(native speed).ShareableArray.defragmentwhereDATA_OBJECT_OFFSETwas erroneously added twice, creating 8-byte gaps between every object.🎯 Why:
The original implementation used
DataView.getUint8/setUint8in a loop, which is significantly slower than direct typed array access or bulk operations. Benchmarks showedUint8Array.setis 10x-50x faster for large blocks, while manual loops are 2x faster for very small blocks.📊 Impact:
ShareableMapdefragmentation test time reduced from ~9.1s to ~7.8s (~14% faster).ShareableArrayspace efficiency improved by removing unnecessary gaps.🔬 Measurement:
Run
npm testand observe the execution time ofsrc/map/__tests__/ShareableMap.spec.ts, specifically the "should correctly defragment the map if required" test case.PR created automatically by Jules for task 15823903321355726499 started by @pverscha