Issue #8335 has been updated by nagachika (Tomoyuki Chikanaga).

Status changed from Open to Closed

Thank you for confirmation.
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Bug #8335: Performance regression with many threads
https://bugs.ruby-lang.org/issues/8335#change-38938

Author: mperham (Mike Perham)
Status: Closed
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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