JRuby: Zero to Scale

Transcript

1. JRuby: Zero to Scale Thomas E. Enebo (@tom_enebo) Charles O.

   Nutter (@headius)

2. • JRuby co-leads • Red Hat Charles Thomas Ruby Java

   Beer

3. What is JRuby? Ruby Implementation (2.5.7 compatible) …which happens to

   run on the Java Virtual Machine (JVM)

4. JRuby 9.2.9.0 • Lots of memory and startup time improvements

   • Better support for Java module system • .jruby.java_opts file to manage JVM options • Improved startup time for most commands • Dozens of issues fixed

5. Getting JRuby in 3 Steps

6. Step 1: You Need a JVM • Java (version 8

   or 11 recommended) • Is it installed? java -version • If !installed • package install: dnf/apt install java • explicit install: http://adoptopenjdk.net

7. Step 2: Install JRuby

8. Step 2: Install JRuby on Windows www.jruby.org

9. Step 3: Profit!

10. Why JRuby? What are the differences? - JRuby - C

    Ruby

11. Native Threads vs Global Interpreter Lock

12. require 'benchmark' ary = (1..1000000).to_a loop { puts Benchmark.measure {

    10.times { ary.each {|i|} } } } Unthreaded require 'benchmark' ary = (1..1000000).to_a loop { puts Benchmark.measure { (1..10).map { Thread.new { ary.each {|i|} } }.map(&:join) } } Multi-threaded

13. Ruby 2.5.7 unthreaded JRuby unthreaded Ruby 2.5.7 threaded JRuby threaded

14. Time (in seconds) 0 0.09 0.18 0.27 0.36 Unthreaded Threaded

    0.15 0.23 0.35 0.34 CRuby JRuby (lower is better)

15. Virtual Machine vs Going It Alone

16. Ruby Teams Hiro Marcin Nahi Subbu Douglas Christian Karol Tom

    Charlie Hiro charli Nahi zzak nurse hsbt matz ko1 nobu OS (libc, ...) JRuby MRI

17. Ruby Teams Hiro Marcin Nahi Subbu Douglas Christian Karol Tom

    Charlie Hiro charli Nahi zzak nurse hsbt matz ko1 nobu OS (libc, ...) JRuby MRI JVM POSIX

18. JVM Ruby Teams Hiro Marcin Nahi Subbu Douglas Christian Karol

    Tom Charlie Hiro charli Nahi zzak nurse hsbt matz ko1 nobu OS (libc, ...) JRuby MRI Better ??? POSIX

19. !Perspective! ??? Total control can be great!

20. Shoulders of Giants JVM J. Rose J. Rose J. Rose

    J. Rose J. Rose J. Rose J. Rose J. Rose J. Rose Hiro Marcin Nahi Subbu Douglas Christian Dmitry Tom Charlie JRuby

21. All the stuff! JVM J. Rose J. Rose J. Rose

    J. Rose J. Rose J. Rose J. Rose J. Rose J. Rose Garbage Collection Native JIT Profiled Optimizations Native Threading Tooling Cross Platform

22. Alternate JVMs • Hotspot: standard OpenJDK Java VM • OpenJ9:

    open source version of IBM's J9 JVM • New GC and JIT tuning options • Startup time and JIT code-caching features • GraalVM: replaces Hotspot JIT with Graal JIT • New JIT optimizations, ahead-of-time native compilation

23. JVM is everywhere++! • Unix++, Windows • Exotic platforms: zLinux,

    OpenVMS, AS/400 • Mobile: Android’s Dalvik, Embedded JVMs

24. Java bytecode == portability

25. 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 No build tools!

26. Ruby C Extensions vs Java Native Extensions

27. Why Extensions? • Performance • Access Existing Library (e.g. openssl)

28. C Extensions • API is massive • API is specific

    to C Ruby’s implementation • It is the implementation • At odds with concurrent Ruby execution • Huge support cost

29. Java Native Extensions • API is massive • API is

    specific to JRuby’s implementation • It is the implementation* • Allows Concurrent Ruby Execution • Support cost minimal • Common Gems Supported * We have plans for a formal API

30. oj: Optimized json • Fast json parsing and dumping with

    many options • Common transitive dependency with its own API • Needed for many popular apps/libraries https://github.com/ohler55/oj

31. oj for JRuby! • 9200 lines of Java (vs 20k

    lines of C) • Almost ready: 448 runs, 765 assertions, 43 failures, 12 errors • 35 F/E from minor features, date/time diffs

32. Load Performance 0M 0.3M 0.6M 0.9M 1.2M small medium large

    0.13 0.29 1.1 0.05 0.11 0.36 0.06 0.11 0.72 MRI (oj) JRuby (json) JRuby (oj) Millions of loads per second (higher is better) https://techblog.thescore.com/2014/05/23/benchmarking-json-generation-in-ruby/

33. Dump Performance 0 0.75 1.5 2.25 3 small medium large

    0.44 0.86 2.3 0.22 0.44 1.1 0.33 0.73 2.1 MRI (oj) JRuby (json) JRuby (oj) Million of dumps per second (higher is better) https://techblog.thescore.com/2014/05/23/benchmarking-json-generation-in-ruby/

34. Scripting Java

35. Scripting Java • Access Java Classes using a Ruby Syntax

    • Java Libraries • Give alternatives to existing Ruby Libraries • Give access to APIs which do not exist in Ruby

36. JRuby IRB

37. Fun Stuff event(:player_egg_throw) do |e| e.hatching = true e.num_hatches =

    120 e.player.mesg "hatched" end Purugin https://github.com/enebo/Purugin

38. JRuby Performance

39. Startup Time • Runtime optimizations give us excellent performance •

    ...eventually! • Startup time, warmup time are impacted • We continue working to reduce this impact • We compare some common commands

40. JRuby Architecture Ruby (.rb) JIT Java Instructions (java bytecode) Ruby

    Instructions (IR) parse interpret interpreter interpret C1 compile native code better native code java bytecode interpreter execute C2 compile Java Virtual Machine JRuby Internals deoptimize Performance improves the longer your app runs

41. JRuby Flag: --dev • export JRUBY_OPTS="--dev" • Disables JRuby's JIT

    • Reduces JVM JIT • Don't use when benchmarking! • 30-40% reduction • More improvements coming total execution time (lower is better) 0s 1.15s 2.3s 3.45s 4.6s gem list (~350 gems) 3.0s 4.6s JRuby JRuby --dev

42. 0 1 2 3 4 gem list 3.05 0.939 CRuby

    JRuby --dev

43. 0 1.75 3.5 5.25 7 rails console 6.7 4.96 CRuby

    JRuby --dev

44. OpenJDK Class Data Sharing • Pre-validate and cache class data

    • Save frequently-accessed data over time • Combined with --dev gives best current JRuby startup

45. Java 11 total execution time (lower is better) 0 1.75

    3.5 5.25 7 gem list (~350 gems) JRuby --dev --dev + CDS

46. App Performance • Sinatra and Roda • https://github.com/CaDs/ruby_benchmarks • Comparing

    JRuby, CRuby, and TruffleRuby • RedMine bug tracker and wiki • https://www.redmine.org/ • Real-world Rails application on JRuby, CRuby

47. Peak Performance • After initial startup, warmup, data caching •

    JRuby generally gives better peak performance • Be aware of warmup time

48. Sinatra and Roda requests/second (higher is better) 0 12500 25000

    37500 50000 Sinatra Roda 5,214 4,257 44,703 42,468 14,489 12,284 CRuby JRuby TruffleRuby

49. Redmine Issue View, rendered and json (higher is better) 0

    req/s 35 req/s 70 req/s 105 req/s 140 req/s issues/13 issues/13.json 137 req/s 50 req/s 91 req/s 41 req/s CRuby 2.6.2 JRuby 9.2.9

50. Warmup Time • Large applications take longer to warm up

    • Working on new JIT metrics, profiling to reduce this curve

51. Sinatra performance over time, requests/second 0rps 12500rps 25000rps 37500rps 50000rps

    5s 10s 15s 20s 25s CRuby JRuby

52. Roda performance over time, requests/second 0rps 12500rps 25000rps 37500rps 50000rps

    5s 10s 15s 20s 25s CRuby JRuby

53. Redmine issues/13.json warmup, one-minute cycles 0 35 70 105 140

    1st 2nd 3rd 4th 5th 6th CRuby 2.6.2 JRuby 9.2.9

54. Redmine memory usage (lower is better) 0MB 375MB 750MB 1125MB

    1500MB Memory usage for 8 workers vs 8 threads 800MB 1,430MB 1,100MB CRuby JRuby (default) JRuby (300MB heap)

55. Migrating An App

56. Migration Process • Existing application Activities: • Configuration Changes (e.g.

    config/database.yml) • C extensions replacement • Thread-safety audit

57. Use-Case: Discourse • “A platform for community discussion” • Very

    large, well-known Rails application • >500 gems • 250,000 lines of Ruby • JRuby is not currently supported • But it is almost working!

58. Step 1: jruby-lint

59. jruby-lint gem See how ready your Ruby code is to

    run on JRuby $ gem install jruby-lint $ cd my-app $ jrlint

60. [] ~/projects/discourse $ jrlint JRuby-Lint version 0.9.0 ./Gemfile:: [gems, info]

    For more on gem compatibility see http://wiki.jruby.org/C-Extension-Alternatives ./Gemfile:80: [gems, warning] Found gem 'oj' which is reported to have some issues: Try `gson`, `json` or `json_pure` instead.| gem 'oj' ./Gemfile:81: [gems, warning] Found gem 'pg' which is reported to have some issues: Use activerecord-jdbcpostgresql-adapter instead or pg_jruby (drop-in replacement).| gem 'pg' ./Gemfile:187: [gems, warning] Found gem 'mysql2' which is reported to have some issues: Use activerecord-jdbcmysql-adapter.| gem 'mysql2' ./Gemfile:188: [gems, warning] Found gem 'redcarpet' which is reported to have some issues: Same as with **RDiscount** use alternatives such as kramdown, Maruku or markdown_j| gem 'redcarpet' ./Gemfile:189: [gems, warning] Found gem 'sqlite3' which is reported to have some issues: Use activerecord-jdbcsqlite3-adapter.| gem 'sqlite3', '~> 1.3.13' ./app/mailers/user_notifications.rb:152: [nonatomic, warning] Non-local operator assignment (@popular_topics) is not guaranteed to be atomic. @popular_topics = topics_for_digest[0, SiteSetting.digest_topics] ./app/mailers/user_notifications.rb:630: [nonatomic, warning] Non-local operator assignment (@site_name) is not guaranteed to be atomic. @site_name = SiteSetting.email_prefix.presence || SiteSetting.title # used by I18n ./app/models/report.rb:21: [nonatomic, warning] Non-local operator assignment (@start_date) is not guaranteed to be atomic. @start_date ||= Report.default_days.days.ago.utc.beginning_of_day ./app/models/report.rb:22: [nonatomic, warning] Non-local operator assignment (@end_date) is not guaranteed to be atomic. @end_date ||= Time.now.utc.end_of_day ./app/models/admin_dashboard_next_data.rb:17: [nonatomic, warning] Non-local operator assignment (@json) is not guaranteed to be atomic. @json ||= get_json ./app/models/topic_posters_summary.rb:31: [nonatomic, warning] Non-local operator assignment (@descriptions_by_id) is not guaranteed to be atomic. @descriptions_by_id ||= begin ./app/models/topic_posters_summary.rb:33: [nonatomic, warning] Non-local operator assignment (descriptions[id]) is not guaranteed to be atomic. descriptions[id] ||= [] ./app/models/topic_posters_summary.rb:79: [nonatomic, warning] Non-local operator assignment (@avatar_lookup) is not guaranteed to be atomic. @avatar_lookup ||= options[:avatar_lookup] || AvatarLookup.new(user_ids) ./app/models/topic_posters_summary.rb:83: [nonatomic, warning] Non-local operator assignment (@primary_group_lookup) is not guaranteed to be atomic. @primary_group_lookup ||= options[:primary_group_lookup] || PrimaryGroupLookup.new(user_ids) ./app/models/directory_item.rb:8: [nonatomic, warning] Non-local operator assignment (@headings) is not guaranteed to be atomic. @headings ||= [:likes_received, ./app/models/directory_item.rb:18: [nonatomic, warning] Non-local operator assignment (@types) is not guaranteed to be atomic. @types ||= Enum.new(all: 1, ./app/models/group_history.rb:11: [nonatomic, warning] Non-local operator assignment (@actions) is not guaranteed to be atomic. @actions ||= Enum.new( ./app/models/locale_site_setting.rb:10: [nonatomic, warning] Non-local operator assignment (@values) is not guaranteed to be atomic. @values ||= supported_locales.map do |locale| ./app/models/locale_site_setting.rb:25: [nonatomic, warning] Non-local operator assignment (@language_names) is not guaranteed to be atomic. @language_names ||= begin ./app/models/locale_site_setting.rb:41: [nonatomic, warning] Non-local operator assignment (@supported_locales) is not guaranteed to be atomic. @supported_locales ||= begin ./app/models/category.rb:98: [nonatomic, warning] Non-local operator assignment (TOPIC_CREATION_PERMISSIONS) is not guaranteed to be atomic. TOPIC_CREATION_PERMISSIONS ||= [:full] ./app/models/category.rb:99: [nonatomic, warning] Non-local operator assignment (POST_CREATION_PERMISSIONS) is not guaranteed to be atomic. POST_CREATION_PERMISSIONS ||= [:create_post, :full] ./app/models/category.rb:109: [nonatomic, warning] Non-local operator assignment (@topic_id_cache) is not guaranteed to be atomic. @topic_id_cache = DistributedCache.new('category_topic_ids') ./app/models/category.rb:228: [nonatomic, warning] Non-local operator assignment (@@cache) is not guaranteed to be atomic. @@cache ||= LruRedux::ThreadSafeCache.new(1000) ./app/models/category.rb:520: [nonatomic, warning] Non-local operator assignment (@has_children) is not guaranteed to be atomic. @has_children ||= (id && Category.where(parent_category_id: id).exists?) ? :true : :false

61. Unsupported Extensions ./Gemfile:: [gems, info] For more on gem compatibility

    see http://wiki.jruby.org/C-Extension-Alternatives ./Gemfile:80: [gems, warning] Found gem 'oj' which is reported to have some issues: Try `gson`, `json` or `json_pure` instead.| gem 'oj' ./Gemfile:81: [gems, warning] Found gem 'pg' which is reported to have some issues: Use activerecord-jdbcpostgresql-adapter instead or pg_jruby (drop-in replacement).| gem 'pg' ./Gemfile:187: [gems, warning] Found gem 'mysql2' which is reported to have some issues: Use activerecord-jdbcmysql-adapter.| gem 'mysql2' ./Gemfile:188: [gems, warning] Found gem 'redcarpet' which is reported to have some issues: Same as with **RDiscount** use alternatives such as kramdown, Maruku or markdown_j| gem 'redcarpet' ./Gemfile:189: [gems, warning] Found gem 'sqlite3' which is reported to have some issues: Use activerecord-jdbcsqlite3-adapter.| gem 'sqlite3', '~> 1.3.13'
62. None

63. Threading Concerns ./app/models/report.rb:21: [nonatomic, warning] Non-local operator assignment (@start_date) is

    not guaranteed to be atomic. @start_date ||= Report.default_days.days.ago.utc.beginning_of_day ./app/models/report.rb:22: [nonatomic, warning] Non-local operator assignment (@end_date) is not guaranteed to be atomic. @end_date ||= Time.now.utc.end_of_day ./app/models/admin_dashboard_next_data.rb:17: [nonatomic, warning] Non-local operator assignment (@json) is not guaranteed to be atomic. @json ||= get_json ./app/models/topic_posters_summary.rb:31: [nonatomic, warning] Non-local operator assignment (@descriptions_by_id) is not guaranteed to be atomic. @descriptions_by_id ||= begin ./app/models/topic_posters_summary.rb:33: [nonatomic, warning] Non-local operator assignment (descriptions[id]) is not guaranteed to be atomic. descriptions[id] ||= [] ./app/models/topic_posters_summary.rb:79: [nonatomic, warning] Non-local operator assignment (@avatar_lookup) is not guaranteed to be atomic. @avatar_lookup ||= options[:avatar_lookup] || AvatarLookup.new(user_ids) ./app/models/topic_posters_summary.rb:83: [nonatomic, warning] Non-local operator assignment (@primary_group_lookup) is not guaranteed to be atomic. @primary_group_lookup ||= options[:primary_group_lookup] || PrimaryGroupLookup.new(user_ids) @language_names) is not guaranteed to be atomic. @language_names ||= begin

64. Unsupported Features ./script/measure.rb:48: [objectspace, warning] Use of ObjectSpace is expensive

    and disabled by default. Use -X+O to enable. ObjectSpace.each_object do |o| ./script/check_forking.rb:14: [fork, error] Kernel#fork is not implemented on JRuby. child = fork do ./script/check_forking.rb:17: [fork, error] Kernel#fork is not implemented on JRuby. grand_child = fork do

65. Step 2: Replace C Extensions

66. % bundle install Fetching pg 1.1.4 Installing pg 1.1.4 with

    native extensions Gem::Ext::BuildError: ERROR: Failed to build gem native extension gem 'pg' Gemfile Gemfile gem 'pg', platform: :mri gem 'activerecord-jdbcpostgresql-adapter', platform: :jruby

67. Missing C Extension 1.Remove it if not needed (development dep

    like byebug) 2.Use a pure-Ruby version if performance is good enough 3.Call into a native library using FFI (Foreign Function Interface) 4.“Script” a Java library 5.Write a JRuby extension

68. Step 3: Run It • Once your application bundles, it

    should run! • If not talk to us or file an issue puma -t 20:20 -e production

69. Monitoring and Profiling

70. JVM Tooling • Visual VM: monitor and profile threads, GC,

    managed heap • Mission Control: visualize Flight Recorder output • Flight Recorder: low-overhead system profiling in OpenJDK • async-profiler: command line profiles, flame graphs of CPU, alloc • All JVM tools work to monitor and profile JRuby apps

71. VisualVM • Standalone graphical console for monitoring, profiling • Open

    sourced as part of OpenJDK project • https://visualvm.github.io/
72. None

73. Visual VM and Visual GC

74. JDK Flight Recorder • JVM flag: -XX:+FlightRecorder • JRuby flag:

    -J-XX:+FlightRecorder or put in JAVA_OPTS • Add --flight-recorder to JRuby launcher? • No overhead or profiling until you start recording • And usually less than 1% overhead for that

75. JDK Mission Control • Control center and visualizer for Flight

    Recorder data • Start and manage recordings • Browse recorded data • https://adoptopenjdk.net/jmc.html
76. None
77. None
78. None
79. None
80. None
81. None

82. async-profiler • JVM extension for lightweight sampled profiles • Install

    jruby-async-profiler gem • jruby -J-agentpath:<jruby home>/lib/libasyncProfiler.so • Simplified command lines coming soon • See https://github.com/jvm-profiling-tools/async-profiler
83. None

84. Final Words

85. Getting Help • JRuby on GitHub: https://github.com/jruby/jruby • Issues, Wiki

    • Chat with JRuby devs, users • jruby on Matrix • #jruby on Freenode IRC • Mailing list: https://lists.ruby-lang.org

86. During Development • JRUBY_OPTS=--dev • BE WARY of .ruby-version •

    Don’t share gem paths between Ruby implementations • Java and C extensions clobber each other

87. Java Modules • Java 9+ introduced Java Modules • You'll

    see warnings about JRuby or Ruby accesses • New config file for JVM flags: .jruby.java_opts • Gather JVM options into a single file • Current dir, home dir, JRuby bin/ dir

88. Java Modules and .jruby.java_opts WARNING: An illegal reflective access operation

    has occurred WARNING: Illegal reflective access by org.bouncycastle.jcajce.provider.drbg.DRBG (file:/Users/headius/.m2/repository/org/ bouncycastle/bcprov-jdk15on/1.61/bcprov-jdk15on-1.61.jar) to constructor sun.security.provider.Sun() WARNING: Please consider reporting this to the maintainers of org.bouncycastle.jcajce.provider.drbg.DRBG WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release --add-opens java.base/java.io=org.jruby.dist --add-opens java.base/java.nio.channels=org.jruby.dist --add-opens java.base/sun.nio.ch=org.jruby.dist --add-opens java.management/sun.management=org.jruby.dist

89. Try JRuby!

90. Let us know if you have any questions!

91. Thank You! • @headius, @tom_enebo • https://www.jruby.org • https://github.com/jruby/jruby •

    Chat with JRuby devs, users • #jruby on Freenode IRC • jruby on Matrix • Mailing list: https://lists.ruby-lang.org