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Optimize Symbol Propagation (propagateSymbolsUp) #9337

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merged 15 commits into from
Nov 27, 2023

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gorakong
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↪️ Pull Request

This PR includes a post-order implementation of dfsFast (an iterative DFS), and is used in propagateSymbolsUp.

Note: skipChildren() is not included in postOrderDfsFast since it doesn't make sense to skip children in a traversal where we visit children before its parents.

These changes result in ~2% performance increase in symbol propagation.

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parcel-benchmark commented Oct 23, 2023

Benchmark Results

Kitchen Sink ✅

Timings

Description Time Difference
Cold 2.08s +32.00ms
Cached 391.00ms +71.00ms ⚠️

Cold Bundles

Bundle Size Difference Time Difference
dist/legacy/parcel.7cdb0fad.webp 102.94kb +0.00b 388.00ms +24.00ms ⚠️
dist/legacy/index.ff03421b.js 1.48kb +0.00b 566.00ms +35.00ms ⚠️
dist/legacy/index.e9bb1616.js 1.06kb +0.00b 565.00ms +34.00ms ⚠️
dist/modern/index.4a29d309.js 921.00b +0.00b 565.00ms +35.00ms ⚠️
dist/legacy/index.html 826.00b +0.00b 597.00ms +32.00ms ⚠️
dist/modern/index.html 749.00b +0.00b 596.00ms +32.00ms ⚠️
dist/legacy/index.b8ae99ba.css 94.00b +0.00b 401.00ms +27.00ms ⚠️
dist/modern/index.31cedca9.css 94.00b +0.00b 400.00ms +26.00ms ⚠️

Cached Bundles

No bundle changes detected.

React HackerNews ✅

Timings

Description Time Difference
Cold 5.22s -169.00ms
Cached 579.00ms +56.00ms ⚠️

Cold Bundles

Bundle Size Difference Time Difference
dist/index.js 459.11kb +0.00b 1.20s -216.00ms 🚀
dist/PermalinkedComment.e9dc4a75.js 3.92kb +0.00b 445.00ms -59.00ms 🚀
dist/UserProfile.8945a243.js 1.38kb +0.00b 445.00ms -59.00ms 🚀
dist/NotFound.8b44a81d.js 269.00b +0.00b 445.00ms -59.00ms 🚀
dist/logo.8dd07848.png 244.00b +0.00b 306.00ms -26.00ms 🚀

Cached Bundles

No bundle changes detected.

AtlasKit Editor ✅

Timings

Description Time Difference
Cold 44.74s -1.23s
Cached 2.77s -84.00ms

Cold Bundles

Bundle Size Difference Time Difference
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Cached Bundles

Bundle Size Difference Time Difference
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dist/index.html 248.00b +0.00b 15.30s +4.12s ⚠️

Three.js ✅

Timings

Description Time Difference
Cold 4.18s -54.00ms
Cached 401.00ms -20.00ms

Cold Bundles

No bundle changes detected.

Cached Bundles

Bundle Size Difference Time Difference
dist/Three.js 572.25kb +0.00b 1.36s -217.00ms 🚀

Click here to view a detailed benchmark overview.

@mischnic
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mischnic commented Nov 6, 2023

Symbol propagation doesn't need the context part of the visitor, you could try to remove that (and have queue just be an array of NodeIds). Might be faster

@mischnic mischnic merged commit dc3d92b into v2 Nov 27, 2023
14 of 16 checks passed
@mischnic mischnic deleted the gkong/optimize-symbol-propagation branch November 27, 2023 18:23
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