Issue #8012 has been reported by ram (Munagala Ramanath).

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

Author: ram (Munagala Ramanath)
Status: Open
Priority: High
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]


$ 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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