Does Ruby 2.2 Have Memory Issues on Heroku?

Question

Many people experienced issues with memory usage when switching their Rails app from Ruby 2.0 to Ruby 2.1 on Heroku. For example, see Memory usage increase with Ruby 2.1 versus Ruby 2.0 or 1.9. Are these issues resolved with Ruby 2.2?

Answer 1

I gave Ruby 2.2 a try with Rails 4.2 and the same memory problems that plagued Ruby 2.1 also occurred. I am switching back to Ruby 2.0. Rails 5 will require Ruby 2.2 and higher so I hope someone will find a way to fix this.

Answer 2

We tried Ruby 2.2.2 on Heroku's Cedar-14 stack, 2X dynos, even reducing Unicorn workers from 5 to 3, and still had memory hover near the 1GB maximum within a few hours of moderate web traffic, and swap size jumped to 200MB - 300MB.