Issue #9518 has been updated by Koichi Sasada.


 (2014/03/29 15:48), normalperson / yhbt.net wrote:
 >  I strongly believe there should no magic based on size.
 
 I need to ask tarui-san, who introduce this mechanism.
 
 Tarui-san, could you give me a comment?
 
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 // SASADA Koichi at atdot dot net

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Bug #9518: Objects in large arrays are leaked
https://bugs.ruby-lang.org/issues/9518#change-45990

* 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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