Rubinius & The Eternal Yak

Talk at FOSDEM 2015 about Rubinius and maintaining Ruby implementations.

Slide 6 is a GIF which can be found here: http://i.imgur.com/5DzWJRx.gifv

Transcript

1. Rubinius & The Eternal Yak @yorickpeterse
2. Rubinius: A better Ruby environment
3. • Just In Time Compiler • Concurrent GC • Manual control over the JIT • C extension support • Largely written in Ruby itself • Periodically updated metrics
4. Rubinius::Metrics.data['gc.large.count'] # => 10 Example use case: New Relic RPM (https:/ /github.com/newrelic/rpm/pull/197)
5. Yak Shaving “Any seemingly pointless activity which is actually necessary to solve a problem which solves a problem which, several levels of recursion later, solves the real problem you're working on.”
7. Presentation Software
8. Maintaining Rubinius
9. Rubinius Features Ruby Compatibility
10. String#scrub Kernel#caller_locations Thread::Backtrace::Location
11. String#scrub “If the string is invalid byte sequence then replace invalid bytes with given replacement character, else returns self”
12. "\x81".scrub # => " " � "\x81".scrub("") # => ""
13. rb_str_scrub() in string.c, 230 lines of C, little documentation, confusing tests string.c: http:/ /bit.ly/1weprdR tests: http:/ /bit.ly/1uar5xp
14. def test_scrub_replace_default assert_equal("\uFFFD\uFFFD\uFFFD", u("\x80\x80\x80").scrub) assert_equal("\uFFFDA", u("\xF4\x80\x80A").scrub) # examples in Unicode 6.1.0 D93b assert_equal("\x41\uFFFD\uFFFD\x41\uFFFD\x41", u("\x41\xC0\xAF\x41\xF4\x80\x80\x41").scrub) assert_equal("\x41\uFFFD\uFFFD\uFFFD\x41", u("\x41\xE0\x9F\x80\x41").scrub) More …
15. 35 assertions, 74 lines, no explanation as to why X does Y
16. https:/ /github.com/rubinius/rubinius/pull/2912 (about 60 lines of Ruby)
17. it "replaces invalid byte sequences" do "abc\u3042\x81".scrub.should == "abc\u3042\uFFFD" end it "returns a copy of self when the input encoding is BINARY" do input = "foo".encode('BINARY') input.scrub.should == "foo" end More ...
18. Kernel#caller_locations “Returns the current execution stack -- an array containing backtrace location objects.”
19. Thread::Backtrace ::Location#path “Returns the file name of this frame.”
20. # Rubinius def path caller_locations[0].path end p path # => "test.rb"
21. # MRI def path caller_locations[0].path end p path # => "/tmp/test.rb"
22. $ grep path test/ruby/test_backtrace.rb => nothing
24. Broke Rails 4.1.x https:/ /github.com/rubinius/rubinius/issues/3223 https:/ /github.com/rails/rails/pull/17782 https:/ /bugs.ruby-lang.org/issues/10561
25. ( °□°) ╯ ╯ ┻━┻ ︵
26. Try Rubinius! http:/ /rubini.us/ https:/ /github.com/rubinius/rubinius
27. Thank You!