JRuby: What's Different (RORO Melbourne October 2011)
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JRuby runs Ruby code on the Java Virtual Machine. This allows Ruby programs to access Java libraries and tools like Swing, and take advantage of features like the JVM's garbage collection and just-in-time compilation. JRuby is compatible with Ruby 1.8.7 and 1.9.2 and runs on multiple platforms. While it has some missing or disabled features compared to MRI Ruby, JRuby programs typically see improved performance due to the JVM. JRuby also enables building scalable, concurrent server applications using Java servers and tools.
JRuby: What's Different (RORO Melbourne October 2011)
- 1. What's Different About JRuby? Charles Oliver Nutter @headius
- 2. What's Different About JRuby? (and why should you care?)
- 3. JRuby Ruby on the JVM
- 6. JRuby Contributors all over the world
- 8. Install JRuby rvm install jruby ; rvm use jruby
- 9. Install JRuby Download tar/zip from jruby.org Unpack archive Add to PATH
- 10. Install JRuby Windows installer at jruby.org
- 11. Get the Book
- 13. The Bad
- 14. Memory Footprint
- 15. Memory Footprint Base memory size is larger (Footprint over time is smaller)
- 16. Memory Footprint Objects are larger
- 17. Memory Footprint Objects are larger (But instance var table is smaller)
- 18. Missing or Disabled Features
- 19. Missing or Disabled Features No Kernel#fork
- 20. Missing or Disabled Features No continuations (callcc)
- 21. Missing or Disabled Features No continuations (callcc) (except for specific forms)
- 22. Missing or Disabled Features ObjectSpace off by default (-X+O to enable)
- 23. Missing or Disabled Features set_trace_func off by default (--debug to enable)
- 24. C Extensions Shipped in JRuby 1.6, still considered experimental
- 25. The Good
- 26. Ruby Itself
- 27. Ruby Itself Ruby 1.8.7 and 1.9.2 in the box
- 28. 28
- 29. 29
- 30. Ruby Itself Multi-VM support (many apps in one process)
- 31. 31
- 32. Ruby Itself Solid across platforms
- 33. Ruby Itself Solid across platforms (Best Ruby on Windows?)
- 34. Ruby Itself Solid across platforms (Best Ruby on OpenVMS?)
- 35. Ruby Itself Solid across platforms (Best Ruby on zLinux?)
- 36. Java Virtual Machine (JVM)
- 37. Java Virtual Machine (JVM) Java libraries like Swing (or Scala, Groovy, Clojure, etc)
- 38. 38
- 39. 39
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- 41. 41
- 42. Java Virtual Machine (JVM) Tools like VisualVM
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- 50. Java Virtual Machine (JVM) Best garbage collectors
- 51. Java Virtual Machine (JVM) Optimizing JIT compiler
- 52. Java Virtual Machine (JVM) Concurrent threading
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- 57. 57
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- 59. Java Virtual Machine (JVM) New dynamic dispatch support (invokedynamic)
- 60. 60
- 61. 61
- 62. Ruby = Method Calls Lots and lots and lots and lots...
- 63. def foo bar end def bar baz foo bar baz end def baz # ... end
- 64. def foo JRuby on Java 5/6 bar end def bar JRuby JRuby baz foo call bar call baz end logic logic def baz # ... end Kills many JVM optimizations
- 65. def foo JRuby on Java 7 bar X X end def bar JRuby JRuby baz foo call bar call baz end logic logic def baz # ... end Dynamic call logic built into JVM
- 66. def foo JRuby on Java 7 bar end def bar baz foo bar baz end def baz # ... end Straight through dispatch path
- 67. def foo JRuby on Java 7 bar end def bar baz foo bar baz end def baz # ... end Optimizations (like inlining) can happen!
- 68. Benchmarks! You know you love them.
- 69. A “Better” fib bench bench_fib_complex.rb 5 35
- 72. Wait for it... Benchmarks are benchmarks. If you don’t like them, give us yours!
- 74. App Development
- 75. App Development Trinidad for command-line server gem install trinidad
- 76. App Development Torquebox for "Enterprise"
- 77. App Development Warbler for WAR/JAR files gem install warbler
- 78. App Development Engine Yard AppCloud engineyard.com/products/appcloud
- 79. App Development Other Java servers using Warbler
- 80. What It Means For You
- 81. What It Means For You Faster Ruby applications
- 82. What It Means For You Better tool ecosystem
- 83. What It Means For You Solid concurrent servers
- 84. What It Means For You A better Ruby experience!
- 85. Thank You! Charles Oliver Nutter @headius
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