Issue #22210 has been updated by jeremyevans0 (Jeremy Evans). Status changed from Open to Closed Fixed by commit:388ea3c3cf19380bf47916a4e6babc16886cd8bc Backport commit for 4.0: https://github.com/ruby/ruby/pull/18081 ---------------------------------------- Bug #22210: Check if issue #19969 is still reproducible / re-opened in 4.0.x https://bugs.ruby-lang.org/issues/22210#change-118253 * Author: saka_omo (Yuki Takei) * Status: Closed * Backport: 3.3: DONTNEED, 3.4: DONTNEED, 4.0: REQUIRED ---------------------------------------- Hi team, I am writing to ask if Bug #19969 might still be reproducible in the current version of Ruby. Could you please check if the issue is still present or if a regression has occurred? I ran the reproduction script from #19969 across several Ruby versions on macOS (arm64-darwin), and while Ruby 3.2.4 fixed the high memory consumption (dropping to 29 MiB), Ruby 4.0.5 spikes back up to 2215 MiB. ``` ruby ruby -v -rset -e 's1 = Set.new(10000.times); s2 = Set.new(9999.times); Array.new(10000) { s1 - s2 - [0] }; puts "#{`ps -o rss= -p #{$$}`.to_i / 1024} MiB"' ``` Results across versions: ``` ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [arm64-darwin22] 183 MiB ruby 3.2.2 (2023-03-30 revision e51014f9c0) [arm64-darwin22] 2364 MiB ruby 3.2.4 (2024-04-23 revision af471c0e01) [arm64-darwin22] 29 MiB ruby 4.0.5 (2026-05-20 revision 64336ffd0e) +PRISM [arm64-darwin24] 2215 MiB ``` -- https://bugs.ruby-lang.org/