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Aloha RubyConf 2012 - JRuby

Talk on "Why JRuby" for Aloha RubyConf 2012.

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Why JRuby?
Me

• Charles Oliver Nutter
 • @headius
• Java developer since 1996
• JRuby developer since 2006
• Red Hat / JBoss polyglot group
What is JRuby?
Aloha RubyConf 2012 - JRuby
Aloha RubyConf 2012 - JRuby
Ruby on JVM
• Core classes and runtime in Java
 • Moving parts to Ruby over time
• Standard command line
• 1.8 and 1.9 compatible
 • 1.9 default in JRuby 1.7
• Drop in replacement for MRI*

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Aloha RubyConf 2012 - JRuby

  • 2. Me • Charles Oliver Nutter • @headius • Java developer since 1996 • JRuby developer since 2006 • Red Hat / JBoss polyglot group
  • 6. Ruby on JVM • Core classes and runtime in Java • Moving parts to Ruby over time • Standard command line • 1.8 and 1.9 compatible • 1.9 default in JRuby 1.7 • Drop in replacement for MRI*
  • 7. *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...
  • 8. JRuby 1.7 • Ruby 1.9.3 mode by default • Many 1.9 compat fixes • Numerous perf improvements • Java 7 invokedynamic support • Beginning of new optimizing compiler
  • 9. Getting Started • Need a JVM... • rvm install jruby • rvm install jruby-1.7.0-RC1 • Download manually • Unpack, edit PATH, done
  • 11. def fractal_flipflop w, h = 44, 54 c = 7 + 42 * w a = [0] * w * h g = d = 0 f = proc do |n| a[c] += 1 o = a.map {|z| " :#"[z, 1] * 2 }.join.scan(/.{#{w * 2}}/) puts "f" + o.map {|l| l.rstrip }.join("n") d += 1 - 2 * ((g ^= 1 << n) >> n) c += [1, w, -1, -w][d %= 4] end 1024.times do !!(!!(!!(!!(!!(!!(!!(!!(!!(true... f[0])...f[1])...f[2])... f[3])...f[4])...f[5])... f[6])...f[7])...f[8]) end end
  • 12. def fractal_flipflop w, h = 44, 54 c = 7 + 42 * w a = [0] * w * h g = d = 0 f = proc do |n| a[c] += 1 o = a.map {|z| " :#"[z, 1] * 2 }.join.scan(/.{#{w * 2}}/) puts "f" + o.map {|l| l.rstrip }.join("n") d += 1 - 2 * ((g ^= 1 << n) >> n) c += [1, w, -1, -w][d %= 4] end 1024.times do !!(!!(!!(!!(!!(!!(!!(!!(!!(true... f[0])...f[1])...f[2])... f[3])...f[4])...f[5])... f[6])...f[7])...f[8]) end end
  • 13. JRuby is the best* Ruby runtime
  • 16. JRuby Team Charlie
  • 17. JRuby Team Charlie Tom Nick Hiro Marcin Nahi Wayne Subbu Douglas Douglas Douglas Contribs
  • 18. JRuby Team Charlie Tom Nick Hiro Marcin Nahi Wayne Subbu Douglas Douglas Douglas Contribs Douglas Douglas Douglas Douglas Douglas Douglas Douglas Other Douglas OpenJDK Android J9 JVMs
  • 19. JRuby Structure JRuby Bytecode Core Java Parser JIT Classes Integ JVM Native Threads GC C API JIT
  • 20. JRuby Structure JRuby Bytecode Core Java Parser JIT Classes Integ JRuby team can focus on implementing JRuby.
  • 21. JRuby Team Doesn’t Have to Work On* • Memory allocation • Native JIT • Garbage collectors • Tooling • Native threading • Server environments • Cross-platform • Native extensions • Mobile/Embedded VMs
  • 22. We could stop working on JRuby and it would continue to get faster.
  • 24. Systems • Best Ruby on Windows? • Exotic platforms: zLinux, OpenVMS, AS/400 • Android’s Dalvik • Embedded JVMs
  • 27. 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
  • 28. 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- No build tools, no native exts required! 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
  • 29. Servers • Any Java server can host Ruby • Trinidad • Ruby-style CLI server atop Tomcat • Torquebox • Full Ruby stack atop JBossAS
  • 30. Ruby App Sinatra Rails Rack Passenger/Thin Apache/Nginx
  • 31. Ruby App Sinatra Rails Rack Tasks Passenger/Thin Resque/ DelayedJob Apache/Nginx
  • 32. Ruby App Sinatra Rails Rack Tasks Passenger/Thin Jobs Resque/ DelayedJob Apache/Nginx crond
  • 33. Ruby App Sinatra Rails Rack Tasks Passenger/Thin Jobs Resque/ DelayedJob Apache/Nginx crond Daemons god/monit
  • 34. TorqueBox AS Sinatra Rails Rack Tasks Procs Jobs Daemons Web Messaging Scheduling Services JBoss AS Clustering Load Balancing HA
  • 35. Torquebox • Rack-compatible • Server management • Database connectivity • Clustering • Background daemons • In and out-process cache • Scheduled jobs • Web sockets • Messaging • Authentication • Asynchronous tasks • XA Transactions
  • 36. Torquebox • Rack-compatible • Server management • Database connectivity • Clustering • All R Background daemons • In and out-process cache • Scheduled jobs uby • Web sockets • Messaging APIs • Authentication • Asynchronous tasks • ! XA Transactions
  • 37. Ruby-friendly Config TorqueBox.configure do   ruby do ruby:     version "1.9"   version: 1.9     compile_mode "off"   compile_mode: off     debug false   debug: false     interactive true   interactive: true     profile_api true   profile_api: true   end end
  • 38. Messaging application: TorqueBox.configure do   ..   ... queues:   queue '/queues/my_app_queue'   /queues/my_app_queue:   topic '/queues/my_app_topic' end topics:   /queues/my_app_topic:
  • 39. Messaging queue = fetch('/queues/foo') queue.publish "A text message" topic = fetch('/topics/foo') topic.publish "A text message" queue = TorqueBox::Messaging::Queue.new('/queues/foo') message = queue.receive topic = TorqueBox::Messaging::Topic.new('/topics/foo') message = topic.receive
  • 41. Libraries • 340k versioned jars in Maven central • Compare to 35k gems in RubyGems.org • Vast majority have no native code • All usable from JRuby
  • 44. JavaFX • Scene graph + optimized graphics • Normal Java library now • R.I.P. JavaFX Script • jrubyfx, other projects to wrap it
  • 45.     @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.new     end       @hour_hand = Path.new.tap do |hh|       hh.fill = Color::BLACK       hh.elements << MoveTo.new(4, -4)       hh.elements << ArcTo.new(-1, -1, 0, -4, -4, false, false)       hh.elements << LineTo.new(0, -radius/4*3)       hh.transforms << Rotate.new     end
  • 46. Purugin • Minecraft scripting in JRuby • Clean and simple DSL • Purogo: LOGO for Minecraft
  • 47. 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   end end
  • 48. Threepence • Ruby APIs atop Ardor3D library • Various games atop Ardor3D • All-in-one clone from Github • Linux, OS X, Windows, Solaris provided
  • 49. require 'example_base' class Box < ExampleBase   def initialize     super("Box Example")   end   def init_application     root.layout do       cull_state :back       skybox(:sky, 500, 500, 500, 'images/skybox/blue')       node(:spinning) do behavior :rotating, Vector3(1, 1, 0.5), 50 box(:left_box, 1, 1, 1) do behavior :rotating, Vector3(0.5, 1, 1), 50 at 0, 0, -3 texture "images/ardor3d_white_256.jpg" end.duplicate_as(:right_box) do at 0, 0, 3 " end       end     end   end end Box.start
  • 50. GC
  • 51. GC Matters • Applications grow over time • Ruby is very object-heavy • Multicore MRI multiplies the problem • You will eventually have issues
  • 52. JVM GC • Wide array of options • Many GCs to choose from • Scales up to massive heaps • Best GCs in the world!
  • 53. OpenJDK GCs • Parallel: multi-core stop-the-world • Concurrent: STW young, concurrent old • G1: concurrent young and old • Serial: single-thread STW
  • 54. gc_demo1.rb • Heavy GC, mix of old and young • Steadily growing heap use
  • 55. class Simple   attr_accessor :next end top = Simple.new puts 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 }
  • 56. Ruby 1.9.3 JRuby 8000 6000 4000 2000 0 GC count
  • 57. Ruby 1.9.3 JRuby 10000 1000 100 10 1 GC count
  • 58. 15 Ruby 1.9.3 JRuby 11.25 7.5 3.75 0 GC time %
  • 59. Ruby 2.0.0 JRuby Time per GC versus heap usage 300ms 225ms 150ms 75ms 0ms 188KB/29MB 27MB/127MB 199MB/238MB Heap usage (MRI/JRuby)
  • 60. gc_demo2.rb • Frequent GC, all young objects • Steadily growing heap use
  • 61. 10.times do   old_ary = []   10000.times do     old_ary << 'foo'     new_ary = []     100000.times do       new_ary << 'bar'     end   end   puts "looped" end
  • 62. Ruby 1.9.3 JRuby 5000 3750 2500 1250 0 GC time (ms)
  • 63. JRuby (Concurrent) Ruby 2.0.0 World-stopping GC pause times 0.3s 0.225s Pause time 0.15s 0.075s 0s 0 5 10 15 20 Seconds since start
  • 64. JRuby (Concurrent) Ruby 2.0.0 World-stopping GC pause times 0.3s im es 0.225s useT Pa Pause time 0.15s 0.075s 0s 0 5 10 15 20 Seconds since start
  • 65. JRuby (Concurrent) Ruby 2.0.0 World-stopping GC pause times 0.3s im es 0.225s useT Pa Pause time 0.15s Use r Ha ppi 0.075s nes s :- ( 0s 0 5 10 15 20 Seconds since start
  • 66. Findings • Lower, more uniform individual GC time • Lower overall GC time • Lower application pause times • More predictable, consistent apps
  • 68. Real Parallellism • Ruby thread = JVM thread = native thread • One process can use all cores • One server can handle all requests
  • 69. require 'benchmark' ary = (1..1000000).to_a loop {   puts Benchmark.measure {     10.times {       ary.each {|i|}     }   } }
  • 70. require 'benchmark' ary = (1..1000000).to_a loop {   puts Benchmark.measure {     (1..10).map {       Thread.new {         ary.each {|i|}       }     }.map(&:join)   } }
  • 73. Ruby 1.9 Ruby 1.9 unthreaded threaded
  • 74. Ruby 1.9 Ruby 1.9 unthreaded threaded JRuby unthreaded
  • 75. Ruby 1.9 Ruby 1.9 unthreaded threaded JRuby JRuby unthreaded threaded
  • 76. threaded_reverse Per-iteration time versus thread count 0.8s 0.65s 0.5s 0.35s 0.2s one thread two threads three threads four threads
  • 77. Nonlinear? • More work means more objects • More objects needs memory bandwidth • No different from multi-process
  • 78. Tools
  • 79. Profiling • Java profilers • VisualVM,YourKit, NetBeans, JXInsight • jruby [--profile | --profile.graph] • jruby -Xreify.classes=true • JVM command-line profilers
  • 80. 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
  • 81. VisualVM • CPU, memory, thread monitoring • CPU and memory profiling • VisualGC • Heap analysis
  • 85. Performance • JRuby compiles Ruby to JVM bytecode • JVM compiles bytecode to native • Best JIT technology in the world • Getting even better with invokedynamic
  • 86. def foo bar end def bar baz foo bar baz end def baz # ... end
  • 87. JRuby on Java 5/6 def foo bar end def bar JRuby JRuby baz foo call bar call baz end logic logic def baz # ... end Kills many JVM optimizations
  • 88. JRuby on Java 7 def foo 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
  • 89. JRuby on Java 7 def foo bar end def bar baz foo bar baz end def baz # ... end Straight through dispatch path
  • 90. JRuby on Java 7 def foo bar end def bar baz foo bar baz end def baz # ... end Optimizations (like inlining) can happen!
  • 91. def foo; 1; end def invoker; foo; end i = 0 while i < 10000   invoker   i+=1 end   0x00000001060a1be0: mov %eax,-0x14000(%rsp)   0x00000001060a1be7: push %rbp   0x00000001060a1be8: sub $0x30,%rsp   0x00000001060a1bec: mov 0x8(%rcx),%r10d   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10   0x00000001060a1bfc: mov 0x10(%r10),%ebp   0x00000001060a1c00: cmp $0xfed77602,%ebp   0x00000001060a1c06: jne 0x00000001060a1c1e   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip)   0x00000001060a1c1d: retq
  • 92. def invoker; 1; end i = 0 while i < 10000   invoker   i+=1 end   0x00000001060a1be0: mov %eax,-0x14000(%rsp)   0x00000001060a1be7: push %rbp   0x00000001060a1be8: sub $0x30,%rsp   0x00000001060a1bec: mov 0x8(%rcx),%r10d   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10   0x00000001060a1bfc: mov 0x10(%r10),%ebp   0x00000001060a1c00: cmp $0xfed77602,%ebp   0x00000001060a1c06: jne 0x00000001060a1c1e   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip)   0x00000001060a1c1d: retq
  • 93. i = 0 while i < 10000   1   i+=1 end   0x00000001060a1be0: mov %eax,-0x14000(%rsp)   0x00000001060a1be7: push %rbp   0x00000001060a1be8: sub $0x30,%rsp   0x00000001060a1bec: mov 0x8(%rcx),%r10d   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10   0x00000001060a1bfc: mov 0x10(%r10),%ebp   0x00000001060a1c00: cmp $0xfed77602,%ebp   0x00000001060a1c06: jne 0x00000001060a1c1e   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip)   0x00000001060a1c1d: retq
  • 94. i = 0 while i < 10000   i+=1 end   0x00000001060a1be0: mov %eax,-0x14000(%rsp)   0x00000001060a1be7: push %rbp   0x00000001060a1be8: sub $0x30,%rsp   0x00000001060a1bec: mov 0x8(%rcx),%r10d   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10   0x00000001060a1bfc: mov 0x10(%r10),%ebp   0x00000001060a1c00: cmp $0xfed77602,%ebp   0x00000001060a1c06: jne 0x00000001060a1c1e   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip)   0x00000001060a1c1d: retq
  • 95.   0x00000001060a1be0: mov %eax,-0x14000(%rsp)   0x00000001060a1be7: push %rbp   0x00000001060a1be8: sub $0x30,%rsp   0x00000001060a1bec: mov 0x8(%rcx),%r10d   0x00000001060a1bf0: cmp $0xfb7aedc9,%r10d   0x00000001060a1bf7: jne 0x00000001060a1c39   0x00000001060a1bf9: mov %rcx,%r10   0x00000001060a1bfc: mov 0x10(%r10),%ebp   0x00000001060a1c00: cmp $0xfed77602,%ebp   0x00000001060a1c06: jne 0x00000001060a1c1e   0x00000001060a1c08: movabs $0x7f6bf4bb0,%rax   0x00000001060a1c12: add $0x30,%rsp   0x00000001060a1c16: pop %rbp   0x00000001060a1c17: test %eax,-0xec3c1d(%rip)   0x00000001060a1c1d: retq
  • 97. JRuby/Java 6 JRuby/Java 7
  • 98. JRuby/Java 6 JRuby/Java 7 Times Faster than Ruby 1.9.3 5 3.75 2.5 1.25 0 base64 richards neural mandelbrot redblack
  • 99. JRuby/Java 6 JRuby/Java 7 Times Faster than Ruby 1.9.3 5 3.75 2.5 1.914 1.806 1.538 1.565 1.25 1.346 0 base64 richards neural mandelbrot redblack
  • 100. JRuby/Java 6 JRuby/Java 7 Times Faster than Ruby 1.9.3 5 4.226 4.32 3.75 3.66 3.44 2.5 2.658 1.914 1.806 1.538 1.565 1.25 1.346 0 base64 richards neural mandelbrot redblack
  • 101. smooth_sort # Original Author: Keith Schwarz (htiek@cs.stanford.edu) # # Translated to Ruby by Chuck Remes (chuckremes on github) # # An implementation of Dijkstra's 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/
  • 102. Ruby 1.9.3 JRuby Rubinius MacRuby Ruby 1.8.7 100000 75000 50000 90593 57215 25000 18376 11439 4750 0 Iterations per second
  • 107. 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!
  • 110. Thank you! • @headius • jruby.org • torquebox.org

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