[ruby-core:118474] [Ruby master Bug#20162] Memory leak when duplicating too complex object
From:
"nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date:
2024-07-08 02:12:02 UTC
List:
ruby-core #118474
Issue #20162 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 3.0: UNKNOWN, 3.1: DONTNEED, 3.2: REQUIRED, 3.3: DONE to 3.0: UNKNOWN, 3.1: DONTNEED, 3.2: DONE, 3.3: DONE
ruby_3_2 commit:c97a632363a170879b9755c5a123e92533908039 merged revision(s) commit:82b57d7bfeefd717c10f7a5a3484aca6b3e708a3.
----------------------------------------
Bug #20162: Memory leak when duplicating too complex object
https://bugs.ruby-lang.org/issues/20162#change-108989
* Author: peterzhu2118 (Peter Zhu)
* Status: Closed
* Backport: 3.0: UNKNOWN, 3.1: DONTNEED, 3.2: DONE, 3.3: DONE
----------------------------------------
GitHub PR: https://github.com/ruby/ruby/pull/9449
Creating a ST table then calling st_replace leaks memory because the st_replace overwrites the ST table without freeing any of the existing memory. This commit changes it to use st_copy instead.
For example:
```ruby
RubyVM::Shape.exhaust_shapes
o = Object.new
o.instance_variable_set(:@a, 0)
10.times do
100_000.times { o.dup }
puts `ps -o rss= -p #{$$}`
end
```
Before:
```
23264
33600
42672
52160
61600
71728
81056
90528
100560
109840
```
After:
```
14752
14816
15584
15584
15664
15664
15664
15664
15664
15664
```
--
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