Issue #9518 has been updated by Eric Wong.


 ko1: may I commit the removal of special case for large array/hash?
 
 * gc.c (rb_gc_writebarrier): remove special case for large hash/array
 
 http://bogomips.org/ruby.git/patch?id=40849ff1bc881
 git://80x24.org/ruby.git gc-nomagic
 
 I strongly believe there should no magic based on size.

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Bug #9518: Objects in large arrays are leaked
https://bugs.ruby-lang.org/issues/9518#change-45989

* 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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