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> This is in no way a good test. Yes, Rubinius takes longer to load than MRI. It'a also JITed, so it needs time to warm up to start screaming.

This is a fair point. You should run ab multiple times over a longer duration of time. 5 seconds seems like a short time to declare an absolute winner.

Honestly I declare no winner. This is a very simple test. I wanted to share with you, to even get tips thanks

Rails 4 is thread safe and I used puma as server Also the app is in production mode and the db pool is 16

Can you post a link to the app? Have you considered running the TechEmpower benchmark app? https://github.com/TechEmpower/FrameworkBenchmarks

Rails 4.0.0 application starting in development on http://0.0.0.0:3000

This most likely means Rack::Lock is used in your test.

I used the following command rails s puma -e production

Rack::Lock was removed as a default in Rails 4.

It's a Rails 4 app. Rack::Lock is removed by default.