Issue #8335 has been updated by mperham (Mike Perham).


Confirmed.  I rebuilt 2.0.0 with RUBY_CFLAGS="-O3" and now performance is as good or better than 1.9.3.  You may close this issue.
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Bug #8335: Performance regression with many threads
https://bugs.ruby-lang.org/issues/8335#change-38936

Author: mperham (Mike Perham)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin12.3.0]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


I've created a simple case to reproduce a performance problem with Sidekiq.  A customer is using 200 worker threads to process background jobs and finding it to be quite slow.  To process 50,000 jobs, it takes Ruby 1.9.3 about 200 seconds.  With Ruby 2.0, the time required is almost double.  Please see instructions to reproduce the problem here:

https://github.com/mperham/sidekiq/tree/master/myapp#ruby-20-slowness-with-big-concurrency


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