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[Backport] 8322149: ConcurrentHashMap smarter presizing for copy constructor and putAll #101

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MaxXSoft opened this issue Aug 30, 2024 · 0 comments
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[Backport] 8322149: ConcurrentHashMap smarter presizing for copy constructor and putAll #101

MaxXSoft opened this issue Aug 30, 2024 · 0 comments

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@MaxXSoft
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Backport this patch to improve performance.

Check openjdk/jdk#17116 for more details.
MaxXSoft added a commit to MaxXSoft/dragonwell21 that referenced this issue Aug 30, 2024
@MaxXSoft
[Backport] 8322149: ConcurrentHashMap smarter presizing for copy cons…
9eb35d8 
…tructor and putAll

Summary: ConcurrentHashMap::ConcurrentHashMap() -> putAll() -> tryPresize() -> transfer() does a lot of unnecessary work. There is nothing to transfer from the old table, since the table is just being initialized.

Testing: CI testing

Reviewers: lingjun-cg, yuleil

Issue: dragonwell-project#101
@MaxXSoft MaxXSoft mentioned this issue Aug 30, 2024
Merged
MaxXSoft added a commit that referenced this issue Sep 5, 2024
@MaxXSoft
[Backport] 8322149: ConcurrentHashMap smarter presizing for copy cons…
745c198 
…tructor and putAll

Summary: ConcurrentHashMap::ConcurrentHashMap() -> putAll() -> tryPresize() -> transfer() does a lot of unnecessary work. There is nothing to transfer from the old table, since the table is just being initialized.

Testing: CI testing

Reviewers: lingjun-cg, yuleil

Issue: #101
@MaxXSoft MaxXSoft closed this as completed Sep 5, 2024
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