EngineeringDirect instruction marking in Ruby 2.6We 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