Why JRuby? - RubyConf 2012

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Talk on why you'll need JRuby someday, delivered by Charles Oliver Nutter and Thomas Enebo at RubyConf 2012.

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  • Why JRuby? - RubyConf 2012

    1. 1. Why JRuby?
    2. 2. Who? Thomas Charlie@tom_enebo @headius
    3. 3. What is JRuby?
    4. 4. JRuby is Ruby! * 1.8.7 & 1.9.3 compatibility drop-in replacement * see next slide
    5. 5. *caveats• Weak but improving low-level UNIX stuff• No C extension support • Not maintained...off by default in 1.7• Some features differ or unavailable • ObjectSpace, trace funcs, callcc, fork...
    6. 6. JRuby is Ruby ...and then some?
    7. 7. Announcing JRuby 1.7.0• Ruby 1.9.3 compat (--1.8 for 1.8.7)• Java 7 invokedynamic support• Much awesomeness over 1.6.x
    8. 8. Getting Started1. Install a JVM2. rvm install jruby3. Profit! % jruby -e ‘puts “wowee”’
    9. 9. The JRuby Difference
    10. 10. JRuby Team Charlie TomNick Hiro Marcin Nahi Wayne Subbu Douglas Douglas Douglas Contribs Douglas Douglas Douglas Douglas Douglas Other Douglas OpenJDK Android JVMs
    11. 11. JRuby JRubyYoko JVMJ. Rose OS (libc, ...)
    12. 12. MRInobu MRI OS (libc, ...)
    13. 13. JRuby JRubyYoko JVMJ. Rose OS (libc, ...)
    14. 14. We get it for Free! JVMJ. Rose Garbage Profiled Native JIT Optimizations Collection Native Tooling Cross Platform Threading
    15. 15. Profile: John Rose • JVM Engineer since 1997 • Invented C* Language • JSR 292 lead
    16. 16. JVM over time(what if we were lazy?)
    17. 17. Go Java Go! 300% for free JRuby 1.0.3 (bm_red_black_tree.rb) 3022.5 15 7.5 0 Java 1.4 Java 5 Java 6 Java 7
    18. 18. Go Java Go! 300% for free JRuby 1.0.3 (bm_red_black_tree.rb) MRI 1.8 3022.5 15 7.5 0 Java 1.4 Java 5 Java 6 Java 7
    19. 19. JVM Benefits
    20. 20. Cross-Platform
    21. 21. JVM is everywhere• Unix++, Windows• Exotic platforms: zLinux, OpenVMS, AS/400• Mobile: Android’s Dalvik, Embedded JVMs
    22. 22. Java bytecode == portability
    23. 23. actionmailer-javamail, active_documentum, activerecord-jdbc-adapter, activerecord-jdbcdbf-adapter, activerecord-jdbcderby-adapter, activerecord-jdbch2-adapter, activerecord-jdbchsqldb-adapter, activerecord-jdbcmssql-adapter, activerecord-jdbcmysql-adapter, activerecord-jdbcpostgresql-adapter, activerecord- jdbcsqlite3-adapter, activerecord-netezza-adapter, activerecord-vertica-adapter, akephalos, akephalos-nerian, akephalos2, akka-actor-jars, akka-remote-jars, akubra_llstore_migrate, Antwrap, async-http-client-jars, atomic, atoulme-Antwrap, autotest-java, bbrowning-deltacloud-client, bbrowning-deltacloud-core, bcrypt-ruby, bee_java, berkeley-db-java-jars, bert, bio-maf, blockenspiel, boc, bond, bosdk, bouncy-castle-java, boxed-geminabox, brute-fuzzy, bryanl-gherkin, bson, buby, buildr, buildr-resolver, buildrizpack, butternut, capistrano-java, capybara-java_script_lint, carrierwave-neo4j, carrierwave_imagevoodoo, cassandra- jars, chrest, cloby, commons-io-jars, concurrently, contextual, coupler, cucumber-java, cucumber-jvm, cuke4duke, cuuid, dm-ldap-adapter, dm-lucene-adapter, do-jdbc_sqlserver, do_derby, do_h2, do_hsqldb, do_jdbc, do_mysql, do_openedge, do_oracle, do_postgres, do_sqlite3, do_sqlserver, doubleshot, dripdrop, dubious, duby, engineyard-visualvm, epall-limelight, errbit_zmq_handler, eurydice, euston, euston-daemons, euston-eventstore, euston-projections, euston- rabbitmq, euston-websites, eventmachine, excemel, faye-websocket, ffi, fig, file-find, fishwife, foreman, forkit, forkjoin, gamelan, gemshit, geoip-jars, get_back, gherkin, glassfish, gravitext-util, gravitext-xmlprod, grizzly, guava-jars, hadoop-find, hashdot-test-daemon, hiredis, hitimes, hope, hostor, hot_bunnies, hourglass, hpricot, http_parser.rb, inline_javascript, iudex, iudex-async-httpclient, iudex-barc, iudex-brutefuzzy-protobuf, iudex-brutefuzzy-service, iudex-char-detector, iudex-core, iudex-da, iudex-filter, iudex-html, iudex-http, iudex-http-test, iudex-httpclient-3, iudex-jetty-httpclient, iudex-rome, iudex-simhash, iudex-worker, ivy-jars, iyyov, jactive_support, java-autotest, java-inline, java2ruby-xmldsig, java_bin, java_inline, java_override, java_properties, java_streamify,java_testing_guff, javabean_xml, javaclass, javaeye4r, javagems, javajake, javaobj, javaobjs, javaobs, javaparse, javasand, javascript-securehash-rails, javascript-state- machine-rails, javascript_auto_include, javascript_eraser, javascript_features, javascript_i18n, javascript_localize, javascript_safe_logger, javascript_util_asset_pack, javascripto, javascripto-rails, jdbc-derby, jdbc-hsqldb, jdbc-jtds, jdbc-openedge, jdbc-openedge-internal, jdbc-postgres, jdbc-sqlite3, jedis-jars, jena-jruby, jessica, jettr, jetty, jetty-jsp, jgeoip, jms4r, jpdfer, jrack_handlers, jrtm, jruby-activemq, jruby-akka_jars, jruby-elasticsearch_jars, jruby- httpclient, jruby-launcher, jruby-management, jruby-metrics, jruby-pageant, jruby-vijava, jruby_gc_stats, jruby_sandbox, jruby_threach, jrubyconf-button, jsmetric4java, json, json-jruby, jsound, kb-activerecord-jdbc-adapter, kirk, kyotocabinet-java, ladle, latex-decode, launchy, libnotify, limelight, linecache, logback, logback-jars, looksee, lumix, mack-javascript, markdownj, maven_irb_plugin, metrics-core-jars, metrics-java, mguymon-buildr, mikka, mini_aether, mirah,mirah_model, miso-java, mixology, mm_mq, mongrel, msgpack-idl-java, msgpack-jruby, multimeter, naether, nanoc-javascript-concatenator, neo4j, neo4j-admin, neo4j-advanced, neo4j-community, neo4j-core, neo4j-enterprise, neo4j-spatial, neo4j-will_paginate, neo4j-wrapper, netty-jars, ning-compress-jars, nio4r,nokogiri, nokogiri-fitzsimmons, nokogiri-maven, nosqoop4u, ontomde-demo-java5, ontomde-java, ontomde-java-frontend, ontomde-uml2-java, ontomde-uml2- kbjava, open_nlp, pacer, pacer-dex, pacer-neo4j, pacer-orient, pelops-jars, persvr, pg_array_parser, protobuf-jars, pry, puma, qtjruby-core, qwirk_active_mq_adapter, qwirk_jms_adapter, rabbitmqadmin-cli, ragweed, rails_javascript_helpers, rakejava, rave, rcov, realityforge-jekyll, realityforge- jekylltask, redcar-bundles, redcar-clojure, redcar-filter-through-command, redcar-groovy, redcar-icons, redcar-javamateview, redcar-javascript, redcar-mirah, redcar-svnkit, redcar-xulrunner-win, RedCloth, refinerycms-javascripts, reigns, revo-nokogiri, rika, rjack-async-httpclient, rjack-commons-codec, rjack-commons-dbcp, rjack-commons-dbutils, rjack-commons-pool, rjack-httpclient-3, rjack-httpclient-4, rjack-icu, rjack-jackson, rjack-jdom, rjack-jets3t, rjack-jetty, rjack-jetty-jsp, rjack-jms, rjack-jms-spec, rjack-logback, rjack-lucene, rjack-maven, rjack-mina, rjack-nekohtml, rjack-protobuf, rjack-qpid-client, rjack-rome, rjack-slf4j, rjack-solr, rjack-tarpit, rjack-xerces, rmagick4j, rmodbus, rtm-javatmapi, rtm-majortom, rtm-ontopia, rtm-tinytim, rtm-tmql, rubeus, rubinius-core- api, ruby-blockcache, ruby-debug-base, ruby-maven, ruby2java, rubydoop, rubyjedi-nokogiri_java, scala-inline, scala-library-jars, scriptty, slf4j, slf4j-jars, slyphon- zookeeper, slyphon-zookeeper_jar, smackr, smartimage, SNMP4JR, solr_sail, spiegela-jruby-httpclient, sproutcore, spymemcached, sqldroid, steamcannon- deltacloud-client, steamcannon-deltacloud-core, stilts-stomp-client, supermarket, svm_toolkit, swt, theduke, thick, to-javascript, torquebox-base, torquebox- cache, torquebox-configure, torquebox-container-foundation, torquebox-core, torquebox-messaging, torquebox-messaging-container, torquebox-naming, torquebox-naming-container, torquebox-security, torquebox-server, torquebox-vfs, torquebox-web, twitter4j4r, UDJrb, unageanu-javaclass, unimidi, universe- javascript, url_escape, weakling, webbit-jars, wildnet-jackson, wildnet-netty, wildnet-server, wildsonet-hazelcast, wildsonet-netty, wildsonet-server, wildsonet- streamer, wrest, wrong, xdojava, xqruby, zookeeper
    24. 24. actionmailer-javamail, active_documentum, activerecord-jdbc-adapter, activerecord-jdbcdbf-adapter, activerecord-jdbcderby-adapter, activerecord-jdbch2-adapter, activerecord-jdbchsqldb-adapter, activerecord-jdbcmssql-adapter, activerecord-jdbcmysql-adapter, activerecord-jdbcpostgresql-adapter, activerecord- jdbcsqlite3-adapter, activerecord-netezza-adapter, activerecord-vertica-adapter, akephalos, akephalos-nerian, akephalos2, akka-actor-jars, akka-remote-jars, akubra_llstore_migrate, Antwrap, async-http-client-jars, atomic, atoulme-Antwrap, autotest-java, bbrowning-deltacloud-client, bbrowning-deltacloud-core, bcrypt-ruby, bee_java, berkeley-db-java-jars, bert, bio-maf, blockenspiel, boc, bond, bosdk, bouncy-castle-java, boxed-geminabox, brute-fuzzy, bryanl-gherkin, bson, buby, buildr, buildr-resolver, buildrizpack, butternut, capistrano-java, capybara-java_script_lint, carrierwave-neo4j, carrierwave_imagevoodoo, cassandra- jars, chrest, cloby, commons-io-jars, concurrently, contextual, coupler, cucumber-java, cucumber-jvm, cuke4duke, cuuid, dm-ldap-adapter, dm-lucene-adapter, do-jdbc_sqlserver, do_derby, do_h2, do_hsqldb, do_jdbc, do_mysql, do_openedge, do_oracle, do_postgres, do_sqlite3, do_sqlserver, doubleshot, dripdrop, dubious, duby, engineyard-visualvm, epall-limelight, errbit_zmq_handler, eurydice, euston, euston-daemons, euston-eventstore, euston-projections, euston- rabbitmq, euston-websites, eventmachine, excemel, faye-websocket, ffi, fig, file-find, fishwife, foreman, forkit, forkjoin, gamelan, gemshit, geoip-jars, get_back, gherkin, glassfish, gravitext-util, gravitext-xmlprod, grizzly, guava-jars, hadoop-find, hashdot-test-daemon, hiredis, hitimes, hope, hostor, hot_bunnies, hourglass, hpricot, http_parser.rb, inline_javascript, iudex, iudex-async-httpclient, iudex-barc, iudex-brutefuzzy-protobuf, iudex-brutefuzzy-service, iudex-char-detector, iudex-core, iudex-da, iudex-filter, iudex-html, iudex-http, iudex-http-test, iudex-httpclient-3, iudex-jetty-httpclient, iudex-rome, iudex-simhash, iudex-worker, ivy-jars, iyyov, jactive_support, java-autotest, java-inline, java2ruby-xmldsig, java_bin, java_inline, java_override, java_properties, java_streamify,java_testing_guff, javabean_xml, javaclass, javaeye4r, javagems, javajake, javaobj, javaobjs, javaobs, javaparse, javasand, javascript-securehash-rails, javascript-state- machine-rails, javascript_auto_include, javascript_eraser, javascript_features, javascript_i18n, javascript_localize, javascript_safe_logger, javascript_util_asset_pack, javascripto, javascripto-rails, jdbc-derby, jdbc-hsqldb, jdbc-jtds, jdbc-openedge, jdbc-openedge-internal, jdbc-postgres, jdbc-sqlite3, No build tools! jedis-jars, jena-jruby, jessica, jettr, jetty, jetty-jsp, jgeoip, jms4r, jpdfer, jrack_handlers, jrtm, jruby-activemq, jruby-akka_jars, jruby-elasticsearch_jars, jruby- httpclient, jruby-launcher, jruby-management, jruby-metrics, jruby-pageant, jruby-vijava, jruby_gc_stats, jruby_sandbox, jruby_threach, jrubyconf-button, jsmetric4java, json, json-jruby, jsound, kb-activerecord-jdbc-adapter, kirk, kyotocabinet-java, ladle, latex-decode, launchy, libnotify, limelight, linecache, logback, logback-jars, looksee, lumix, mack-javascript, markdownj, maven_irb_plugin, metrics-core-jars, metrics-java, mguymon-buildr, mikka, mini_aether, mirah,mirah_model, miso-java, mixology, mm_mq, mongrel, msgpack-idl-java, msgpack-jruby, multimeter, naether, nanoc-javascript-concatenator, neo4j, neo4j-admin, neo4j-advanced, neo4j-community, neo4j-core, neo4j-enterprise, neo4j-spatial, neo4j-will_paginate, neo4j-wrapper, netty-jars, ning-compress-jars, nio4r,nokogiri, nokogiri-fitzsimmons, nokogiri-maven, nosqoop4u, ontomde-demo-java5, ontomde-java, ontomde-java-frontend, ontomde-uml2-java, ontomde-uml2- kbjava, open_nlp, pacer, pacer-dex, pacer-neo4j, pacer-orient, pelops-jars, persvr, pg_array_parser, protobuf-jars, pry, puma, qtjruby-core, qwirk_active_mq_adapter, qwirk_jms_adapter, rabbitmqadmin-cli, ragweed, rails_javascript_helpers, rakejava, rave, rcov, realityforge-jekyll, realityforge- jekylltask, redcar-bundles, redcar-clojure, redcar-filter-through-command, redcar-groovy, redcar-icons, redcar-javamateview, redcar-javascript, redcar-mirah, redcar-svnkit, redcar-xulrunner-win, RedCloth, refinerycms-javascripts, reigns, revo-nokogiri, rika, rjack-async-httpclient, rjack-commons-codec, rjack-commons-dbcp, rjack-commons-dbutils, rjack-commons-pool, rjack-httpclient-3, rjack-httpclient-4, rjack-icu, rjack-jackson, rjack-jdom, rjack-jets3t, rjack-jetty, rjack-jetty-jsp, rjack-jms, rjack-jms-spec, rjack-logback, rjack-lucene, rjack-maven, rjack-mina, rjack-nekohtml, rjack-protobuf, rjack-qpid-client, rjack-rome, rjack-slf4j, rjack-solr, rjack-tarpit, rjack-xerces, rmagick4j, rmodbus, rtm-javatmapi, rtm-majortom, rtm-ontopia, rtm-tinytim, rtm-tmql, rubeus, rubinius-core- api, ruby-blockcache, ruby-debug-base, ruby-maven, ruby2java, rubydoop, rubyjedi-nokogiri_java, scala-inline, scala-library-jars, scriptty, slf4j, slf4j-jars, slyphon- zookeeper, slyphon-zookeeper_jar, smackr, smartimage, SNMP4JR, solr_sail, spiegela-jruby-httpclient, sproutcore, spymemcached, sqldroid, steamcannon- deltacloud-client, steamcannon-deltacloud-core, stilts-stomp-client, supermarket, svm_toolkit, swt, theduke, thick, to-javascript, torquebox-base, torquebox- cache, torquebox-configure, torquebox-container-foundation, torquebox-core, torquebox-messaging, torquebox-messaging-container, torquebox-naming, torquebox-naming-container, torquebox-security, torquebox-server, torquebox-vfs, torquebox-web, twitter4j4r, UDJrb, unageanu-javaclass, unimidi, universe- javascript, url_escape, weakling, webbit-jars, wildnet-jackson, wildnet-netty, wildnet-server, wildsonet-hazelcast, wildsonet-netty, wildsonet-server, wildsonet- streamer, wrest, wrong, xdojava, xqruby, zookeeper
    25. 25. Libraries Lucene Neo4j Selenium47k libraries in MavenHadoop EHCache JMonkeyEngine Sitemesh
    26. 26. Languages/Polyglot Clojure Scala JythonRhino/Nashorn/ GroovyDynJS (JavaScript) Micro Focus JVM Visual COBOL
    27. 27. Polyglot• Use right tool for the right job• Running in the same VM• Another dimension of libraries
    28. 28. GC
    29. 29. GC Matters• Applications grow over time• Ruby is very object-heavy• Multiprocess multiplies the problem• You will eventually have issues
    30. 30. JVM GC• Wide array of options• Many GCs to choose from• Scales up to massive heaps• Best GCs in the world!
    31. 31. OpenJDK GCs• Parallel: multi-core stop-the-world• Concurrent: STW young, concurrent old• G1: concurrent young and old• Serial: single-thread STW
    32. 32. Object Homogeneity• Everything expressed as JVM objects• Everything shares the same infrastructure • Including extensions, libraries, etc• One GC to rule them all • And one standard memory model
    33. 33. gc_demo.rb• Heavy GC, mix of old and young• Steadily growing heap use
    34. 34. class Simple  attr_accessor :nextendtop = Simple.newputs Benchmark.measure {  outer = 10  total = 100000  per = 100  outer.times do    total.times do      per.times { Simple.new }      s = Simple.new      top.next = s      top = s    end  end}
    35. 35. Ruby 1.9.3 JRuby8000600040002000 0 GC count
    36. 36. Ruby 1.9.3 JRuby10000 1000 100 10 1 GC count
    37. 37. 15 Ruby 1.9.3 JRuby11.25 7.5 3.75 0 GC time %
    38. 38. Ruby 2.0.0 JRuby Time per GC versus heap usage 300ms 225msTime per GC 150ms 75ms 0ms 188KB/29MB 27MB/127MB 199MB/238MB Heap usage (MRI/JRuby)
    39. 39. Ruby 2.0.0 JRuby Time per GC versus heap usage :-( :-(User Unhappiness :-/ :-| :-) 188KB/29MB 27MB/127MB 199MB/238MB Heap usage (MRI/JRuby)
    40. 40. Ruby 2.0.0 4,000 3,000Time Per GC (ms) 2,000 1,000 0 0M 1,250M 2,500M 3,750M 5,000M Heap Size
    41. 41. Findings• Lower, more uniform GC times• Reduced or eliminated pauses• Very large heaps are no problem• Predictable, consistent experience
    42. 42. Threads
    43. 43. Real Parallellism• Ruby thread = JVM thread = native thread• One process can use all cores• One server can handle all requests
    44. 44. require benchmarkary = (1..1000000).to_aloop {  puts Benchmark.measure {    10.times {      ary.each {|i|}    }  }}
    45. 45. require benchmarkary = (1..1000000).to_aloop {  puts Benchmark.measure {    (1..10).map {      Thread.new {        ary.each {|i|}      }    }.map(&:join)  }}
    46. 46. Ruby 1.9unthreaded
    47. 47. Ruby 1.9 Ruby 1.9unthreaded threaded
    48. 48. Ruby 1.9 Ruby 1.9unthreaded threaded JRubyunthreaded
    49. 49. Ruby 1.9 Ruby 1.9unthreaded threaded JRuby JRubyunthreaded threaded
    50. 50. threaded_reverse Per-iteration time versus thread count 0.8s0.65s 0.5s0.35s 0.2s one thread two threads three threads four threads
    51. 51. Nonlinear?• More work means more objects• Allocation/GC needs memory bandwidth• No different from multi-process
    52. 52. Tools
    53. 53. Profiling• Java profilers • VisualVM,YourKit, NetBeans, JXInsight• jruby [--profile | --profile.graph]• jruby -Xreify.classes=true• JVM command-line profilers
    54. 54. Monitoring• Java Management Extensions (JMX) • Gems available for clients and servers• jconsole and VisualVM• Most servers provide additional tools• New Relic, etc have JVM support
    55. 55. VisualVM• CPU, memory, thread monitoring• CPU and memory profiling• VisualGC• Heap analysis
    56. 56. JRuby Goodies
    57. 57. Scripting Java
    58. 58. JavaFX straight port Simple Clock
    59. 59. @minute_hand = Path.new.tap do |mh| Draw minute hand mh.setFill(Color::BLACK) mh.getElements.add MoveTo.new(4, -4) mh.getElements.add ArcTo.new(-1, -1, 0, -4, -4, false, false) mh.getElements.add LineTo.new(0, -radius) mh.getTransforms.add Rotate.newend Implement Java Eventclass Refresher include EventHandler handler def handle(event); event.source.refresh; endend refresh timeline every 1sTimeline.new.tap do |time| time.setCycleCount Timeline::INDEFINITE time.getKeyFrames.add(Keyframe.new(Duration.millis(1000)), Refresher.new) time.playend
    60. 60. getFooBar -> fooBar@minute_hand = Path.new.tap do |mh| mh.setFill(Color::BLACK) was getElements mh.elements.add MoveTo.new(4, -4) mh.elements.add ArcTo.new(-1, -1, 0, -4, -4, false, false) mh.elements.add LineTo.new(0, -radius) mh.transforms.add Rotate.newend was getTransformsclass Refresher include EventHandler def handle(event); event.source.refresh; endendTimeline.new.tap do |time| time.setCycleCount Timeline::INDEFINITE time.keyFrames.add(Keyframe.new(Duration.millis(1000)), Refresher.new) time.playend was getKeyFrames
    61. 61. setFoo(a) -> foo = a@minute_hand = Path.new.tap do |mh| mh.fill = Color::BLACK was setFill mh.elements.add MoveTo.new(4, -4) mh.elements.add ArcTo.new(-1, -1, 0, -4, -4, false, false) mh.elements.add LineTo.new(0, -radius) mh.transforms.add Rotate.newendclass Refresher include EventHandler def handle(event); event.source.refresh; endendTimeline.new.tap do |time| was setCycleCount time.cycleCount = Timeline::INDEFINITE time.keyFrames.add(Keyframe.new(Duration.millis(1000)), Refresher.new) time.playend
    62. 62. camelCase -> camel_case@minute_hand = Path.new.tap do |mh| mh.fill = Color::BLACK mh.elements.add MoveTo.new(4, -4) mh.elements.add ArcTo.new(-1, -1, 0, -4, -4, false, false) mh.elements.add LineTo.new(0, -radius) mh.transforms.add Rotate.newendclass Refresher include EventHandler def handle(event); event.source.refresh; endendTimeline.new.tap do |time| was cycleCount time.cycle_count = Timeline::INDEFINITE time.key_frames.add(Keyframe.new(Duration.millis(1000)), Refresher.new) time.playend was keyFrames
    63. 63. Procs as interfaces@minute_hand = Path.new.tap do |mh| mh.fill = Color::BLACK mh.elements.add MoveTo.new(4, -4) mh.elements.add ArcTo.new(-1, -1, 0, -4, -4, false, false) mh.elements.add LineTo.new(0, -radius) mh.transforms.add Rotate.newend No more extra classTimeline.new.tap do |time| time.cycle_count = Timeline::INDEFINITE time.key_frames.add Keyframe.new(Duration.millis(1000)) {refresh} time.playend
    64. 64. Common Adornments ‘add’ becomes ‘<<‘@minute_hand = Path.new.tap do |mh| mh.fill = Color::BLACK mh.elements << MoveTo.new(4, -4) mh.elements << ArcTo.new(-1, -1, 0, -4, -4, false, false) mh.elements << LineTo.new(0, -radius) mh.transforms << Rotate.newendTimeline.new.tap do |time| time.cycle_count = Timeline::INDEFINITE time.key_frames << Keyframe.new(Duration.millis(1000)) {refresh} time.playend
    65. 65. Purugin• Minecraft scripting in JRuby• Clean and simple DSL• Purogo: LOGO for Minecraft
    66. 66. turtle("four-sided triangle") do |*args|  dim = (args[0] || 5).to_i  block_type = (args[1] || :stone).to_sym  layer do    4.times do |i|      forward dim      turnleft 90    end  end    pivot do    block :none    forward 1    turnleft 90    forward 1    turnup 90    forward 1    turndown 90    turnright 90    block block_type  end  block block_type  (1...dim).step(2).to_a.reverse.each do |i|    dim = i    layer    pivot  endend
    67. 67. Pimping a side-projecthttps://github.com/enebo/Purugin
    68. 68. Java Native Extensions
    69. 69. Native Extensions Suck“Look, nobody enjoysshooting penguins, but ifyou have to shoot penguins,well, you might as wellenjoy it.” - Free Waterfall Sr.
    70. 70. Flowchart of ShameCan I write it in Ruby? Script Java? no yes no Does it need Can I use FFI? to be n times faster? no no Native Extension
    71. 71. Java Native Extensions• Written in Java • Have same performance as Java • Use same GC as JRuby • First Class Citizens
    72. 72. Performance
    73. 73. Go Java Go! 300% for free JRuby 1.0.3 (bm_red_black_tree.rb) 3022.5 15 7.5 0 Java 1.4 Java 5 Java 6 Java 7
    74. 74. Go JRuby Go! OpenJDK 8 (bm_red_black_tree.rb)86420 1.0.3 1.1.6 1.4.0 1.5.6 1.6.8 1.7.0
    75. 75. Severe gains??? OpenJDK 8 (bm_red_black_tree.rb) 9 Severe perf bottleneck(s)6.75 4.52.25 0 1.0.3 1.1.6 1.4.0 1.5.6 1.6.8 1.7.0
    76. 76. 1.0.3 & red_black_tree -J-verbose:gc [GC (Allocation Failure) 223608K->96408K(330752K), 0.0159780 secs] [GC (Allocation Failure) 208920K->100792K(335168K), 0.0157550 secs] [GC (Allocation Failure) 213304K->105144K(332160K), 0.0181010 secs]8.1s [GC (Allocation Failure) 205112K->108920K(334400K), 0.0187580 secs] [GC (Allocation Failure) 208888K->112712K(329152K), 0.0154440 secs] +28 more [GC (Allocation Failure) 313780K->199892K(339072K), 0.0142010 secs] [GC (Allocation Failure) 318420K->204420K(331520K), 0.0175690 secs]8.4s [GC (Allocation Failure) 306948K->208316K(335680K), 0.0188120 secs] [Full GC (Ergonomics) 208316K->54991K(352256K), 0.2709750 secs] [GC (Allocation Failure) 157519K->58959K(349248K), 0.0120840 secs] +28 more Moar Objects!
    77. 77. 1.7.0 & red_black_tree-J-verbose:gc [GC (Allocation Failure) 155729K->39697K(207296K), 0.0072730 secs] 0.963s [GC (Allocation Failure) 160785K->40657K(208320K), 0.0108620 secs] 0.968s [GC (Allocation Failure) 161745K->41649K(210112K), 0.0083760 secs] 0.968s [GC (Allocation Failure) 166193K->39729K(210688K), 0.0070670 secs] 0.99s
    78. 78. OpenJDK 8 (bm_red_black_tree.rb) 32.25 1.50.75 0 1.1.6 1.4.0 1.5.6 1.6.8 1.7.0
    79. 79. OpenJDK 8 (bm_red_black_tree.rb) 3 JVM Feature!2.25 1.50.75 0 1.1.6 1.4.0 1.5.6 1.6.8 1.7.0
    80. 80. Performance• JRuby compiles Ruby to JVM bytecode• JVM compiles bytecode to native• Best JIT technology in the world• Getting even better with invokedynamic
    81. 81. How to Optimize Ruby• Do less work • Reduce dispatch and call overhead • Reduce memory overhead• Find static patterns • Profile running code • Emit optimized version with guards
    82. 82. JVM Optimizations• Profiling • Watch code, optimize hottest paths• Inlining • Combine code, optimize as a whole• Escape analysis • Eliminate transient objects
    83. 83. def foo; Object.new; enddef invoker; foo; endi = 0while i < 10000  invoker  i+=1end
    84. 84. Inline foo into invoker def invoker; Object.new; end i = 0 while i < 10000   invoker   i+=1 end
    85. 85. Inline invoker into loop i = 0 while i < 10000   Object.new   i+=1 end
    86. 86. Object is transienti = 0while i < 10000  i+=1end
    87. 87. Loop does nothingi = 10000
    88. 88. Variable i is never read
    89. 89. InvokeDynamic• Java 7+ feature• Allows us to teach JVM about Ruby • Dynamic calls can inline • Constants become truly constant • JVM’s best optimizations can work
    90. 90. Does It Work?
    91. 91. def foo; 1; enddef invoker; foo; endN.times do i = 0 while i < 10000   invoker   i+=1 endend
    92. 92. $ jruby -J-XX:+UnlockDiagnosticVMOptions -J-XX:+PrintInlining -J-XX:+PrintCompilation script.rb 79 1 b java.lang.String::hashCode (55 bytes) 109 2 b java.util.Properties$LineReader::readLine (452 bytes) @ 48 java.io.Reader::read (9 bytes) never executed @ 62 java.io.FilterInputStream::read (9 bytes) @ 303 java.lang.System::arraycopy (0 bytes) (intrinsic) @ 388 java.io.Reader::read (9 bytes) never executed....
    93. 93. def foo; 1; end def invoker; foo; end N.times do i = 0 while i < 10000    invoker    i+=1 end end3321 190 b ruby.__dash_e__::block_0$RUBY$__file__ (83 bytes) @ 6 org.jruby.RubyFixnum::op_lt (22 bytes) inline (hot) @ 66 org.jruby.RubyBasicObject::isTrue (15 bytes) inline (hot) @ 6 ruby.__dash_e__::method__1$RUBY$invoker (9 bytes) inline (hot) @ 6 ruby.__dash_e__::method__0$RUBY$foo (7 bytes) inline (hot) @ 5 org.jruby.RubyFixnum::op_plus_one (31 bytes) inline (hot)
    94. 94. def foo; 1; end def invoker; foo; end N.times do i = 0 while i < 10000    invoker    i+=1 end end3321 190 b ruby.__dash_e__::block_0$RUBY$__file__ (83 bytes) @ 6 org.jruby.RubyFixnum::op_lt (22 bytes) inline (hot) @ 66 org.jruby.RubyBasicObject::isTrue (15 bytes) inline (hot) @ 6 ruby.__dash_e__::method__1$RUBY$invoker (9 bytes) inline (hot) @ 6 ruby.__dash_e__::method__0$RUBY$foo (7 bytes) inline (hot) @ 5 org.jruby.RubyFixnum::op_plus_one (31 bytes) inline (hot)
    95. 95. def foo; 1; end def invoker; foo; end N.times do i = 0 while i < 10000    invoker    i+=1 end end3321 190 b ruby.__dash_e__::block_0$RUBY$__file__ (83 bytes) @ 6 org.jruby.RubyFixnum::op_lt (22 bytes) inline (hot) @ 66 org.jruby.RubyBasicObject::isTrue (15 bytes) inline (hot) @ 6 ruby.__dash_e__::method__1$RUBY$invoker (9 bytes) inline (hot) @ 6 ruby.__dash_e__::method__0$RUBY$foo (7 bytes) inline (hot) @ 5 org.jruby.RubyFixnum::op_plus_one (31 bytes) inline (hot)
    96. 96. def foo; 1; end def invoker; foo; end N.times do i = 0 while i < 10000    invoker    i+=1 end end3321 190 b ruby.__dash_e__::block_0$RUBY$__file__ (83 bytes) @ 6 org.jruby.RubyFixnum::op_lt (22 bytes) inline (hot) @ 66 org.jruby.RubyBasicObject::isTrue (15 bytes) inline (hot) @ 6 ruby.__dash_e__::method__1$RUBY$invoker (9 bytes) inline (hot) @ 6 ruby.__dash_e__::method__0$RUBY$foo (7 bytes) inline (hot) @ 5 org.jruby.RubyFixnum::op_plus_one (31 bytes) inline (hot)
    97. 97. def foo; 1; end def invoker; foo; end N.times do i = 0 while i < 10000    invoker    i+=1 end end3321 190 b ruby.__dash_e__::block_0$RUBY$__file__ (83 bytes) @ 6 org.jruby.RubyFixnum::op_lt (22 bytes) inline (hot) @ 66 org.jruby.RubyBasicObject::isTrue (15 bytes) inline (hot) @ 6 ruby.__dash_e__::method__1$RUBY$invoker (9 bytes) inline (hot) @ 6 ruby.__dash_e__::method__0$RUBY$foo (7 bytes) inline (hot) @ 5 org.jruby.RubyFixnum::op_plus_one (31 bytes) inline (hot)
    98. 98. def foo; 1; end def invoker; foo; end N.times do i = 0 while i < 10000    invoker    i+=1 end end3321 190 b ruby.__dash_e__::block_0$RUBY$__file__ (83 bytes) @ 6 org.jruby.RubyFixnum::op_lt (22 bytes) inline (hot) @ 66 org.jruby.RubyBasicObject::isTrue (15 bytes) inline (hot) @ 6 ruby.__dash_e__::method__1$RUBY$invoker (9 bytes) inline (hot) @ 6 ruby.__dash_e__::method__0$RUBY$foo (7 bytes) inline (hot) @ 5 org.jruby.RubyFixnum::op_plus_one (31 bytes) inline (hot)
    99. 99. def foo; 1; end def invoker; foo; end N.times do i = 0 while i < 10000    invoker    i+=1 end end3321 190 b ruby.__dash_e__::block_0$RUBY$__file__ (83 bytes) @ 6 org.jruby.RubyFixnum::op_lt (22 bytes) inline (hot) @ 66 org.jruby.RubyBasicObject::isTrue (15 bytes) inline (hot) @ 6 ruby.__dash_e__::method__1$RUBY$invoker (9 bytes) inline (hot) @ 6 ruby.__dash_e__::method__0$RUBY$foo (7 bytes) inline (hot) @ 5 org.jruby.RubyFixnum::op_plus_one (31 bytes) inline (hot)
    100. 100. def foo; 1; end def invoker; foo; end N.times do i = 0 while i < 10000    invoker    i+=1 end end3321 190 b ruby.__dash_e__::block_0$RUBY$__file__ (83 bytes) @ 6 org.jruby.RubyFixnum::op_lt (22 bytes) inline (hot) @ 66 org.jruby.RubyBasicObject::isTrue (15 bytes) inline (hot) @ 6 ruby.__dash_e__::method__1$RUBY$invoker (9 bytes) inline (hot) @ 6 ruby.__dash_e__::method__0$RUBY$foo (7 bytes) inline (hot) @ 5 org.jruby.RubyFixnum::op_plus_one (31 bytes) inline (hot)
    101. 101. Does It Help?
    102. 102. JRuby/Java 6 JRuby/Java 7
    103. 103. JRuby/Java 6 JRuby/Java 7 Times Faster than Ruby 1.9.3 53.75 2.51.25 0 base64 richards neural mandelbrot redblack
    104. 104. JRuby/Java 6 JRuby/Java 7 Times Faster than Ruby 1.9.3 53.75 2.5 1.914 1.806 1.538 1.5651.25 1.346 0 base64 richards neural mandelbrot redblack
    105. 105. JRuby/Java 6 JRuby/Java 7 Times Faster than Ruby 1.9.3 5 4.226 4.323.75 3.66 3.44 2.5 2.658 1.914 1.806 1.538 1.5651.25 1.346 0 base64 richards neural mandelbrot redblack
    106. 106. smooth_sort# Original Author: Keith Schwarz (htiek@cs.stanford.edu)## Translated to Ruby by Chuck Remes (chuckremes on github)## An implementation of Dijkstras Smoothsort algorithm, a modification of# heapsort that runs in O(n lg n) in the worst case, but O(n) if the data# are already sorted. For more information about how this algorithm works# and some of the details necessary for its proper operation, please see## http://www.keithschwarz.com/smoothsort/
    107. 107. Ruby 1.8.7 Ruby 1.9.3 Ruby 2.0.0 JRuby100000 75000 50000 25000 19590.7 11439 4750 0 Iterations per second
    108. 108. And Rails?
    109. 109. Your Turn• Try your apps on JRuby and tell us• Turn on JRuby in @travisci• Let us know what you think of JRuby• Help us make JRuby even better!• JRuby BOF in Room C at 6:30PM
    110. 110. JRUBY BOOK
    111. 111. Thank you!• @headius• jruby.org• torquebox.org

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