YARV

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. YARV (Yet another Ruby VM) is a bytecode interpreter that was developed for the Ruby programming language by Koichi Sasada. The goal of the project was to greatly reduce the execution time of Ruby programs. Since YARV has become the official Ruby interpreter for Ruby 1.9, it is also named KRI as Koichi's Ruby Interpreter. Benchmarks by rubychan.de showed significant increases in performance. Benchmarks by Antonio Cangiano showed an average four times speed improvement over the original interpreter. Both evaluations comprised a mix of mostly synthetic benchmarks. Ruby on Rails was reported to run about 15% faster with YARV compared to Ruby 1.8.6. However, startup time and ActiveRecord use are still slower.