Issue #19550 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED to 2.7:
DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE
ruby_3_2 9fb94407b97bb85ea344e67606f8ae9ba0bdbd48 merged revision(s)
417b1a36447cb2c650de55b433ba623541fb8bb3.
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Bug #19550: Memory leak in iclass for 32 bit systems
https://bugs.ruby-lang.org/issues/19550#change-103890
* Author: peterzhu2118 (Peter Zhu)
* Status: Closed
* Priority: Normal
* Backport: 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE
----------------------------------------
If !RCLASS_EXT_EMBEDDED (e.g. 32 bit systems) then the rb_classext_t is allocated throug
malloc so it must be freed.
The issue can be seen in the following script:
```ruby
20.times do
100_000.times do
mod = Module.new
Class.new do
include mod
end
end
# Output the Resident Set Size (memory usage, in KB) of the current Ruby process
puts `ps -o rss= -p #{$$}`
end
```
Before this fix, the max RSS is 280MB, while after this change, it's 30MB.
--
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