Ruby goes to hollywood

Ruby goes to @elise_huard Euruko 2011Monday 30 May 2011

Why Concurrency?Monday 30 May 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)Monday 30 May 2011

Concurrency != ParallellismMonday 30 May 2011

3 threads, 2 cores 1 1 2 2 3 1 3 3 2 1 core1 core2 core1 core2Monday 30 May 2011

Your program language VM OS (kernel processes, other processes) multicore - multiCPUMonday 30 May 2011

Concurrency will melt your brain non-determinism mutable AND shared stateMonday 30 May 2011

Actor ModelMonday 30 May 2011

Hewitt et al. 1973 no shared state in response to a message, an actor can: make local decisions create more actors send more messages determine how to respond to the next message receivedMonday 30 May 2011

Hewitt et al. 1973 Generalization of the lambda calculusMonday 30 May 2011

Inspiration artiﬁcial intelligence ‘quantum mechanics’ - observing details by which the order of arrival of messages for an actor is determined can affect resultMonday 30 May 2011

The point only actors - no global state partial order of execution from http://pragprog.com/titles/vspcon/programming-concurrency-on-the-jvmMonday 30 May 2011

Implementations • using threads/processes • async messaging - mailbox • pattern matching on incoming messages • actors = state machines.Monday 30 May 2011

Lifecycle from http://pragprog.com/titles/vspcon/programming-concurrency-on-the-jvmMonday 30 May 2011

Sleeping barber shop with x chairs 1 barber no customer: sleep. customers: cut hairs customer if barber is sleeping: wake him up else if enough chairs take a chair else leaveMonday 30 May 2011

Monday 30 May 2011

Actors in RubyMonday 30 May 2011

Concurrent gem theoretical - different concurrency models https://github.com/mental/concurrentMonday 30 May 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"Monday 30 May 2011

Revactor concurrent I/O for networking apps Evented rather than parallel https://github.com/tarcieri/revactorMonday 30 May 2011

Celluloid thread-based actors based on erlang https://github.com/tarcieri/celluloidMonday 30 May 2011

No true parallelism with MRIMonday 30 May 2011

Cheat on RubyMonday 30 May 2011

Erlang light-weight processes = actorsMonday 30 May 2011

Erlang blocking receives timeouts supervision trees: fault-toleranceMonday 30 May 2011

Erlectricity require rubygems require erlectricity receive do |f| f.when([:echo, String]) do |text| f.send!([:result, "You said: #{text}"]) f.receive_loop end end https://github.com/mojombo/erlectricityMonday 30 May 2011

Reia or Elixir languages on erlang vm friendlier, more ruby-like, OOMonday 30 May 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 libraryMonday 30 May 2011

Akka actor model + software transactional memory java and scalaMonday 30 May 2011

Akka • sending: reply is possible or not, sync or async • supervision: several strategies • as library or as framework • local and distributedMonday 30 May 2011

JRuby!Monday 30 May 2011

CaveatMonday 30 May 2011

Advantages easy to grasp real encapsulation - separation of concerns highly decentralizedMonday 30 May 2011

But many messages (bandwidth) livelocks are still possibleMonday 30 May 2011

Back to RubyMonday 30 May 2011

Time to control shared state ? Change RubySpec: default: variables not shared between threads? integrate better concurrency primitives into the Ruby stdlib ?Monday 30 May 2011

Let’s think about it.Monday 30 May 2011

Thanks @elise_huard http://www.delicious.com/elisehuard/concurrencyMonday 30 May 2011

Ruby goes to Hollywood Elise Huard LRUG 11-04-2011Monday 30 May 2011

Ruby goes to Hollywood Elise Huard LRUGMonday 30 May 2011

Monday 30 May 2011

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Ruby goes to hollywood

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