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lib: add SafeArray to primordials and use it for FreeList - #36600

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lib: add SafeArray to primordials and use it for FreeList#36600
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Refs: #36304 (comment)
Refs: #36565

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

@Lxxyx

Lxxyx commented Dec 22, 2020

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Run Benchmark on my computer, seems the performance issues still exists.

                           confidence improvement accuracy (*)    (**)   (***)
 misc/freelist.js n=100000        ***    -92.46 %      ±1.94% ±2.61% ±3.46%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case there are 1 comparisons, you can thus
expect the following amount of false-positive results:
  0.05 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.01 false positives, when considering a   1% risk acceptance (**, ***),
  0.00 false positives, when considering a 0.1% risk acceptance (***)

@aduh95

aduh95 commented Dec 22, 2020

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Benchmark confirmed very poor performance results…

                            confidence improvement accuracy (*)   (**)  (***)
 misc/freelist.js n=100000        ***    -91.36 %       ±3.89% ±5.24% ±6.96%

@targos targos added the lib / src Issues and PRs related to general changes in the lib or src directory. label Dec 27, 2020
@ExE-Boss

ExE-Boss commented Mar 7, 2021

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If I had to guess, I’d say V8 is doing some inlining shenanigans when it detects a push or pop method on an ordinary array with %Array.prototype% in its [[Prototype]] internal slot.


By inlining the methods in #37649, I hope to make FreeList faster and resilient to mutation of %Array.prototype%.pop and %Array.prototype%.push

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This pull request has been marked as stale due to 90 days of inactivity.
It will be automatically closed in 30 days if no further activity occurs. If this is still relevant, please leave a comment or update it to keep it open.

@github-actions github-actions Bot added the stale label Jul 28, 2026
@ExE-Boss
ExE-Boss marked this pull request as draft July 28, 2026 05:24
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ExE-Boss marked this pull request as ready for review July 28, 2026 06:46
@codecov

codecov Bot commented Jul 28, 2026

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Codecov Report

❌ Patch coverage is 93.18182% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.14%. Comparing base (b2a024b) to head (ff89dbe).

Files with missing lines Patch % Lines
lib/internal/per_context/primordials.js 92.85% 3 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main   #36600      +/-   ##
==========================================
- Coverage   90.15%   90.14%   -0.02%     
==========================================
  Files         744      744              
  Lines      242542   242582      +40     
  Branches    45690    45700      +10     
==========================================
+ Hits       218672   218682      +10     
- Misses      15362    15394      +32     
+ Partials     8508     8506       -2     
Files with missing lines Coverage Δ
lib/internal/freelist.js 100.00% <100.00%> (ø)
lib/internal/per_context/primordials.js 98.78% <92.85%> (+0.44%) ⬆️

... and 31 files with indirect coverage changes

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