Direct instruction marking in Ruby 2.6 - The GitHub Blog

We recently upgraded GitHub to use the latest version of Ruby 2.6. Ruby 2.6 contains an optimization for reducing memory usage.We recently upgraded GitHub to use the latest version of Ruby 2.6. Ruby 2.6 contains an optimization for reducing memory usage. We’ve found it to reduce the “post-boot live heap” by about 3 percent. The “post-boot live heap” are the objects still referenced and not garbage collected after booting our Rails application, but before accepting any requests.