From: "naruse (Yui NARUSE)" <naruse@...>
Date: 2013-08-07T12:24:40+09:00
Subject: [ruby-core:56427] [ruby-trunk - Bug #8012][Assigned] Performance	degradation in 2.0.0p0


Issue #8012 has been updated by naruse (Yui NARUSE).

Status changed from Open to Assigned
Assignee set to ko1 (Koichi Sasada)
Priority changed from High to Normal
Target version set to current: 2.1.0


----------------------------------------
Bug #8012: Performance degradation in 2.0.0p0
https://bugs.ruby-lang.org/issues/8012#change-40959

Author: ram (Munagala Ramanath)
Status: Assigned
Priority: Normal
Assignee: ko1 (Koichi Sasada)
Category: 
Target version: current: 2.1.0
ruby -v: ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]
Backport: 


$ 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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