Ruby hollywood

Ruby goes to Hollywood @elise_huard LRUGTuesday 12 April 2011

Why Concurrency?Tuesday 12 April 2011

“... for the ﬁrst time in history, no one is building a much faster sequential processor. If you want your programs to run signiﬁcantly faster (...) you’re going to have to parallelize your program.” Hennessy and Patterson “Computer Architectures” (4th edition, 2007)Tuesday 12 April 2011

Concurrent programs != Parallel computingTuesday 12 April 2011

3 threads, 2 cores 1 1 2 2 3 1 3 3 2 1 core1 core2 core1 core2Tuesday 12 April 2011

Your program language VM OS (kernel processes, other processes) multicore - multiCPUTuesday 12 April 2011

Concurrency will melt your brain non-determinism shared stateTuesday 12 April 2011

Actor ModelTuesday 12 April 2011

Hewitt et al. 1973 no shared state in response to a message that it receives, an actor can: make local decisions create more actors send more messages determine how to respond to the next message receivedTuesday 12 April 2011

Inspiration Artiﬁcial Intelligence quantum mechanics - we cannot observe the details by which the order of arrival of messages for an actor is determined. attempting to do so can affect result and push indeterminacy elsewhere.Tuesday 12 April 2011

The point only actors no global state partial order of executionTuesday 12 April 2011

Actors in RubyTuesday 12 April 2011

definitely not parallelTuesday 12 April 2011

Rubinius Actors require actor actor = Actor.spawn(Actor.current) do |master| msg = Actor.receive master.send msg end actor.send "test" msg = Actor.receive # msg == "test"Tuesday 12 April 2011

Revactor sock = Revactor::TCP.connect(host, port) listener = Revactor::TCP.listen(addr, port) sock = listener.accept sock.controller = Actor.current sock.active = true Actor.receive do |filter| filter.when(Case[:tcp, sock, Object]) do |_, _, data| ... end filter.when(Case[:somethingelse, Object]) do |_, message| ... end endTuesday 12 April 2011

Concurrent gem theoretical - different concurrency models use rubinius style actors in other versions of Ruby https://github.com/mental/concurrentTuesday 12 April 2011

Meh.Tuesday 12 April 2011

Cheat on RubyTuesday 12 April 2011

Erlang light-weight processes = actorsTuesday 12 April 2011

Erlectricity https://github.com/mojombo/erlectricity require rubygems require erlectricity receive do |f| f.when([:echo, String]) do |text| f.send!([:result, "You said: #{text}"]) f.receive_loop end endTuesday 12 April 2011

Erlectricity -module(echo). -export([test/0]). test() -> Cmd = "ruby echo.rb", Port = open_port({spawn, Cmd}, [{packet, 4}, nouse_stdio, exit_status, binary]), Payload = term_to_binary({echo, <<"hello world!">>}), port_command(Port, Payload), receive {Port, {data, Data}} -> {result, Text} = binary_to_term(Data), io:format("~p~n", [Text]) end.Tuesday 12 April 2011

BERT RPC BERT (Binary ERlang Term) serialization library for Ruby. convert data into erlang binary format before sending them over the wireTuesday 12 April 2011

Scala “We also included enhancements to make it easier to call from Ruby into Scala libraries, which has enabled the Lift web framework to offer support for Ruby.” Charles Nutter, ‘JRuby 1.6 released, now what ?’ http://www.engineyard.com/blog/2011/jruby-1-6-released-now-what/ Actors in standard libraryTuesday 12 April 2011

Akka https://github.com/danielribeiro/RubyOnAkkaTuesday 12 April 2011

Back to RubyTuesday 12 April 2011

Time to control shared state ? Change RubySpec ? default variables: not shared between threads have keyword for shared variablesTuesday 12 April 2011

Let’s think about it.Tuesday 12 April 2011

Thanks @elise_huardTuesday 12 April 2011

Ruby goes to Hollywood Elise Huard LRUG 11-04-2011Tuesday 12 April 2011

Ruby goes to Hollywood Elise Huard LRUGTuesday 12 April 2011

Ruby hollywood

by ehuard on Apr 12, 2011

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Ruby hollywood — Presentation Transcript