From: shibata.hiroshi@...
Date: 2014-01-30T06:16:49+00:00
Subject: [ruby-core:60282] [ruby-trunk - Bug #8012] Performance degradation	in 2.0.0p0

Issue #8012 has been updated by Hiroshi SHIBATA.

Target version changed from 2.1.0 to current: 2.2.0

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Bug #8012: Performance degradation in 2.0.0p0
https://bugs.ruby-lang.org/issues/8012#change-44764

* Author: Munagala Ramanath
* Status: Assigned
* Priority: Normal
* Assignee: Koichi Sasada
* Category: 
* Target version: current: 2.2.0
* ruby -v: ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]
* Backport: 
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$ ruby -v
ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]

I'm running a simple CPU intensive benchmark:

puts (0..11).to_a.permutation.inject(0) { |m, _| m += 1 }

This takes around 158s with 1.9.3 and 200s with 2.0.0p0 which seems
like a substantial degradation.

Running with -rprofile shows a large number of calls to
"nil#" in 2.0.0p0 which are absent in 1.9.3

Please see the thread in http://www.ruby-forum.com/topic/4411570#new
for more details.




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