RVM and Ruby Interpreters @ RSC Roma 03/2011
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Basic introduction to RVM, the Ruby Version Manager, and a showcase of the currently (March 2011) available ruby interpreters.
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RVM and Ruby Interpreters @ RSC Roma 03/2011
- 1. RVM Cut Rubies With Ease Sunday, March 6, 2011
- 2. Ruby Version Manager • Multiple Ruby versions (compiled) and installed in parallel • Each Ruby version has its own environment, lives in different directories • Shell scripts to manage PATH, GEM_PATH, GEM_HOME and much more Sunday, March 6, 2011
- 3. Why? Sunday, March 6, 2011
- 4. Ecosystem • MRI (1.8) • YARV (1.9) • REE • Rubinius • JRuby • MacRuby • IronRuby, MagLev, HotRuby (!) Sunday, March 6, 2011
- 5. MRI (1.8) • Gold Ruby Standard • Reference implementation (written in C) • Good enough for most applications • Slow: no bytecode, no JIT • No built-in encoding support - only Iconv • GC sucks Sunday, March 6, 2011
- 6. REE (1.8) • From Passenger (Apache/Nginx module for Rails apps) devs - phusion.nl • COW friendly • Google’s tcmalloc • Union Station - released yesterday Sunday, March 6, 2011
- 7. YARV (1.9) • Current stable, built upon 1.8 C codebase • Everything works out of the box unless depends_on?(Unmantained::Stuff) • Faster than 1.8: bytecode, JIT (no rt.jar :) • Strong encoding support • GC (still) sucks Sunday, March 6, 2011
- 8. Rubinius • Ruby deserves to become first-class citizen • Most of the stdlib written in Ruby • Written in C++, bytecode, JIT • Built on LLVM, spinned off RubySpec • FFI subsystem for existing C extensions • http://rubini.us/2011/02/25/why-use-rubinius/ Sunday, March 6, 2011
- 9. JRuby • Ruby built on the JVM - from 1.5 onwards • Fully interoperable • Works {on,with} Java {servers, libraries} • Call Java from Ruby and Ruby from Java • FFI subsystem for existing C extensions • Fast performance (JIT), Slow startup time Sunday, March 6, 2011
- 10. MacRuby • Sponsored by Apple, works only on OS X • Built upon Objective-C runtime and LLVM • A Ruby wrapper around CoreFoundation • JITted, compiles to binary code • Real GUIs can be built with it Sunday, March 6, 2011
- 11. Others • IronRuby is Ruby on .NET • MagLev is distributed object persistence amongst networked Ruby processes • HotRuby is Ruby in the browser via Javascript and Flash (!) • RVM is the easiest way to try them all! Sunday, March 6, 2011
- 12. Install RVM • Run bash < <(curl http:// rvm.beginrescueend.com/ releases/rvm-install-head ) • Add [[ -s ~/.rvm/scripts/rvm ]] && source ~/.rvm/scripts/rvm to ~/.bashrc • Set! Sunday, March 6, 2011
- 13. RTFM http://rvm.beginrescueend.com/ Sunday, March 6, 2011
- 14. Install something • rvm install 1.8 # the last 1.8 release • rvm install 1.9 # as above, for 1.9 • rvm install rbx # Rubinius • rvm install ree • rvm install jruby Sunday, March 6, 2011
- 15. What have we got? $ rvm list rvm rubies macruby-0.6 [ x86_64 ] rbx-1.2.2-20110222 [ ] ree-1.8.7-2010.01 [ ] ruby-1.8.7-p330 [ ] ruby-1.9.2-p0 [ ] Sunday, March 6, 2011
- 16. System ruby $ rvm system $ type ruby ruby is /usr/bin/ruby $ ruby -v ruby 1.8.7 (2009-06-12 patchlevel 174) [universal- darwin10.0] Sunday, March 6, 2011
- 17. Let’s switch! # Caveat - exact ruby version $ rvm 1.9.2p0 $ type ruby ruby is /Users/vjt/.rvm/rubies/ ruby-1.9.2-p0/bin/ruby $ ruby -v ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64- darwin10.4.0] Sunday, March 6, 2011
- 18. Again $ rvm rbx-1.2.2 $ type ruby ruby is /Users/vjt/.rvm/rubies/ rbx-1.2.2-20110222/bin/ruby $ ruby -v rubinius 1.2.2 (1.8.7 release 2011-02-22 JI) [x86_64-apple- darwin10.5.0] Sunday, March 6, 2011
- 19. What am I using? $ rvm list rvm rubies macruby-0.6 [ x86_64 ] => rbx-1.2.2-20110222 [ ] ree-1.8.7-2010.01 [ ] ruby-1.8.7-p330 [ ] ruby-1.9.2-p0 [ ] Sunday, March 6, 2011
- 20. Upgrade? # Ruby $ rvm upgrade 1.9.2-p0 1.9.2- p180 # RVM itself $ rvm get head Sunday, March 6, 2011
- 21. Gemsets $ rvm 1.9@someapp $ gem list *** LOCAL GEMS *** abstract (1.0.0) actionmailer (3.0.3) actionpack (3.0.3) activemodel (3.0.3) activerecord (3.0.3) ...... Sunday, March 6, 2011
- 22. Gemsets, continued $ rvm 1.9@antani $ gem list *** LOCAL GEMS *** rake (0.8.7) $ Work in isolation on different apps with different dependencies. Sunday, March 6, 2011
- 23. Development • Put .rvmrc in the root of your project • Add it to the ignore list of your SCM • RVM will execute it when you enter the root $ cat .rvmrc rvm 1.8.7@ifad-members [ -z "$SYBASE" -a -x /opt/sybase/SYBASE.sh ] && { echo "loading sybase environment..." . /opt/sybase/SYBASE.sh } Sunday, March 6, 2011
- 24. Production? .bashrc: source ~/.rvm/scripts/rvm runner: exec sudo -i -H -u someuser bash -c 'echo; cd; exec unicorn -c config/unicorn.conf.rb -E production -D' Sunday, March 6, 2011
- 25. Production - more • Keep applications isolated from each others • Run applications requiring different interpreters along each other • Compile ruby with -static and run everything in a chroot() [coming soon] • Different users? Just use symlinks Sunday, March 6, 2011
- 26. Thank you http://sindro.me/ http://twitter.com/vjt vjt@openssl.it Sunday, March 6, 2011