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Treasure Island
Tour
Guides
@tlossen
@phuesler
“The Free Lunch is Over.”
 — Herb Sutter (2005)
Concurrency
Fin?
Concurrency
Multi Core
Thread
Concurrency
!fork()
Rubies!!!
GIL
http://igvita.com/2008/11/13/concurrency-is-a-myth-in-ruby/
Ruby MRI 1.8   X
  REE 1.8      X
Ruby MRI 1.9   X
 IronRuby      (✔)
  Maglev        ?
  Rubinius     ✔
   JRuby       ✔
 MacRuby       ✔
JRuby
Java Island
Multi-Threading
Evil?
java.util.
concurrent
Atomic
Boolean
CountDown
  Latch
Cyclic
Barrier
Executor
Future
Actors
Bad Actors
and the
nominees are...
MRI
Better Actors
Erlang
Scala
Rubinius
JRuby
Frameworks
Akka
Scala
Heavily Inspired
   by Erlang
Simple
Concurrency
Distributed
Fault
Tolerant
Supervisors
Fast
Can it be used
 with JRuby?
Yes*
Moarrrrr!!!!
STM
Evented
Disruptor
http://martinfowler.com/articles/lmax.html
Q&A
“There ain’t no such
thing as a free lunch.”
 — Robert A. Heinlein

          ❦
Links
• “The Free Lunch Is Over” (Herb Sutter, 2005)
• “Real-World Concurrency” (Bryan Cantrill, Jeff
    Bonwick, 2008)
•   “Don't Fear the Threads” (David Copeland, 2012)
•   “Concurrency is not Parallelism” (Rob Pike, 2012)
•   “The LMAX Architecture” (Martin Fowler, 2011)
Credits
Ajith Kumar (Flickr)


tontoncopt (Flickr)


Hatem Riahi (Flickr)


Stefanie (Flickr)
Credits
Barry Skeates (Flickr)


Hillary White (Flickr)


David Thompson (Flickr)


“Dope Zebra”, Rhett & Link

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