Issue #9518 has been updated by Koichi Sasada.


Yes, you are right. WB (write barrier) strategy doesn't care such case.

How many such program?
If it is popular case, we can care about it.



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Bug #9518: Objects in large arrays are leaked
https://bugs.ruby-lang.org/issues/9518#change-45462

* Author: Charlie Somerville
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin13.0]
* Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN
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a = [nil] * 131071
loop { a << Object.new; a.pop }
# process RSS stays stable

a = [nil] * 131072
loop { a << Object.new; a.pop }
# process RSS grows quickly and never falls

It seems to be related to this bit of code: https://github.com/github/ruby/blob/2.1/gc.c#L4764-4766



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